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1

CAST  

NSDL National Science Digital Library

The Council for Agricultural Science and Technology (CAST) was formed in 1972 as a result of a meeting sponsored by the National Academy of Sciences' National Research Council. CAST's mission is to "assemble, interpret, and communicate credible science-based information regionally, nationally, and internationally to legislators, regulators, policymakers, the media, the private sector and the public." Visitors will find the Education tab near the top of the page to be particularly helpful for those who want to pursue agricultural careers or learn about agricultural education, such as 4-H or Future Farmers of America. The CAST Videos section has a number of PowerPoint presentations on current topics of importance in agriculture, such as "The Science and Regulation of Food from Genetically Engineered Animals," "Food Safety and Fresh Produce," and "Probiotics in Human Health." A number of the papers that accompany the PowerPoint presentations are available for free.

2012-02-06

2

CAST  

NSDL National Science Digital Library

The Council for Agricultural Science and Technology (CAST) was formed in 1972 as a result of a meeting sponsored by the National Academy of Sciences' National Research Council. CAST's mission is to "assemble, interpret, and communicate credible science-based information regionally, nationally, and internationally to legislators, regulators, policymakers, the media, the private sector and the public." Visitors will find the Education tab near the top of the page to be particularly helpful for those who want to pursue agricultural careers or learn about agricultural education, such as 4-H or Future Farmers of America. The CAST Videos section has a number of PowerPoint presentations on current topics of importance in agriculture, such as "The Science and Regulation of Food from Genetically Engineered Animals," "Food Safety and Fresh Produce," and "Probiotics in Human Health." A number of the papers that accompany the PowerPoint presentations are available for free.

2012-02-03

3

Urinary casts  

MedlinePLUS

... casts; Casts in the urine; Fatty casts; Red blood cell casts; White blood cell casts ... dehydration, exercise, or (water pills) diuretic medicines. Red blood cell casts are a sign of bleeding into ...

4

Casting Technology.  

ERIC Educational Resources Information Center

Three articles discuss (1) casting technology as it relates to industry, with comparisons of shell casting, shell molding, and die casting; (2) evaporative pattern casting for metals; and (3) high technological casting with silicone rubber. (JOW)

Wright, Michael D.; And Others

1992-01-01

5

Die Casting.  

National Technical Information Service (NTIS)

Contents: Mechanical properties of creep resistant zinc die casting alloys; Studies on a gravity die cast zinc base alloy; Parashot system for turbulence-free injection of metal; Zinc--the versatile metal; Prevention of metal dribble on hot chamber die ca...

1977-01-01

6

Die Casting.  

National Technical Information Service (NTIS)

Contents: Recording technical information in pressure diecasting; Influence of copper addition on the dendritic structure of ILZRO-12; Graphite innoculated alloys for pressure die casting; Zinc--The versatile metal; Removal of scales from die cooling chan...

1978-01-01

7

Hair casts  

PubMed Central

Hair casts or pseudonits are circumferential concretions, which cover the hair shaft in such a way that, it could be easily removed. They are thin, cylindrical, and elongated in length. We present an unusual case of an 8-year-old girl presenting with hair casts. Occurrence of these is unusual, and they may have varied associations. This patient was suffering from developmental delay. It is commonly misdiagnosed as and very important to differentiate from pediculosis capitis.

Parmar, Sweta S.; Parmar, Kirti S.; Shah, Bela J.

2014-01-01

8

Hair casts.  

PubMed

Hair casts or pseudonits are circumferential concretions, which cover the hair shaft in such a way that, it could be easily removed. They are thin, cylindrical, and elongated in length. We present an unusual case of an 8-year-old girl presenting with hair casts. Occurrence of these is unusual, and they may have varied associations. This patient was suffering from developmental delay. It is commonly misdiagnosed as and very important to differentiate from pediculosis capitis. PMID:25396168

Parmar, Sweta S; Parmar, Kirti S; Shah, Bela J

2014-10-01

9

Project CAST.  

ERIC Educational Resources Information Center

The document outlines procedures for implementing Project CAST (Community and School Together), a community-based career education program for secondary special education students in Charles County, Maryland. Initial sections discuss the role of a learning coordinator, (including relevant travel reimbursement and mileage forms) and an overview of…

Charles County Board of Education, La Plata, MD. Office of Special Education.

10

Casting methods  

DOEpatents

A casting device includes a covered crucible having a top opening and a bottom orifice, a lid covering the top opening, a stopper rod sealing the bottom orifice, and a reusable mold having at least one chamber, a top end of the chamber being open to and positioned below the bottom orifice and a vacuum tap into the chamber being below the top end of the chamber. A casting method includes charging a crucible with a solid material and covering the crucible, heating the crucible, melting the material, evacuating a chamber of a mold to less than 1 atm absolute through a vacuum tap into the chamber, draining the melted material into the evacuated chamber, solidifying the material in the chamber, and removing the solidified material from the chamber without damaging the chamber.

Marsden, Kenneth C.; Meyer, Mitchell K.; Grover, Blair K.; Fielding, Randall S.; Wolfensberger, Billy W.

2012-12-18

11

Clamshell Casting! Stefanie Wuhrer  

E-print Network

Clamshell Casting! By Stefanie Wuhrer A thesis submitted to the Faculty of Graduate Studies and Research acceptance of the thesis, Clamshell Casting! submitted by Stefanie Wuhrer Douglas Howe (Director is casting, where liquid is poured into a cast and the cast is removed once the liquid has hardened. We

Wuhrer, Stefanie

12

Steel castings by the electroslag casting technique  

NASA Astrophysics Data System (ADS)

Electroslag casting facilities in Canada and the United States were reviewed. Several value body castings of 2 1/4 Cr-1 Mo, 9 Cr-1 Mo, and 18% Cr-8% Ni (Mo) steels were made at the University of British Columbia facility. These castings were examined for surface finish, chemical segregation, and macrostructure in the as-cast condition and after various heat treatments. Castings were subjected to tensile, charpy impact, and creep testing. Results of these tests were compared with similar data on wrought material and where applicable, with data on sand castings.

Sikka, V. K.; Mitchell, A.

1984-10-01

13

Steel castings by the electroslag casting technique  

SciTech Connect

Electroslag casting facilities in Canada and the United States were reviewed. Several valve body castings of 2 1/4 Cr-1 Mo, 9 Cr-1 Mo, and 18% Cr-8% Ni(Mo) steels were made at the University of British Columbia facility. These castings were examined for surface finish, chemical segregation, and macrostructure in the as-cast condition and after various heat treatments. Castings were subjected to tensile, Charpy impact, and creep testing. Results of these tests were compared with similar data on wrought material and, where applicable, with data on sand castings. 22 figures.

Sikka, V.K.; Mitchell, A.

1984-10-01

14

Thin Wall Iron Castings  

SciTech Connect

Results of an investigation made to develop methods of making iron castings having wall thicknesses as small as 2.5 mm in green sand molds are presented. It was found that thin wall ductile and compacted graphite iron castings can be made and have properties consistent with heavier castings. Green sand molding variables that affect casting dimensions were also identified.

J.F. Cuttino; D.M. Stefanescu; T.S. Piwonka

2001-10-31

15

LLNL casting technology  

Microsoft Academic Search

Competition to produce cast parts of higher quality, lower rejection rate, and lower cost is a fundamental factor in the global economy. To gain an edge on foreign competitors, the US casting industry must cut manufacturing costs and reduce the time from design to market. Casting research and development (R&D) are the key to increasing US competiveness in the casting

A. B. Shapiro; W. J. Comfort III

1994-01-01

16

LLNL casting technology  

NASA Astrophysics Data System (ADS)

Competition to produce cast parts of higher quality, lower rejection rate, and lower cost is a fundamental factor in the global economy. To gain an edge on foreign competitors, the US casting industry must cut manufacturing costs and reduce the time from design to market. Casting research and development (R&D) are the key to increasing US competiveness in the casting arena. Lawrence Livermore National Laboratory (LLNL) is the home of a wide range of R&D projects that push the boundaries of state-of-the art casting. LLNL casting expertise and technology include: casting modeling research and development, including numerical simulation of fluid flow, heat transfer, reaction/solidification kinetics, and part distortion with residual stresses; special facilities to cast toxic material; extensive experience casting metals and nonmetals; advanced measurement and instrumentation systems. Department of Energy (DOE) funding provides the leverage for LLNL to collaborate with industrial partners to share this advanced casting expertise and technology. At the same time, collaboration with industrial partners provides LLNL technologists with broader insights into casting industry issues, casting process data, and the collective experience of industry experts. Casting R&D is also an excellent example of dual-use technology; it is the cornerstone for increasing US industrial competitiveness and minimizing waste nuclear material in weapon component production. Annual funding for casting projects at LLNL is $10M, which represents 1% of the total LLNL budget. Metal casting accounts for about 80% of the funding. Funding is nearly equally divided between development directed toward US industrial competitiveness and weapon component casting.

Shapiro, A. B.; Comfort, W. J., III

1994-01-01

17

LLNL casting technology  

SciTech Connect

Competition to produce cast parts of higher quality, lower rejection rate, and lower cost is a fundamental factor in the global economy. To gain an edge on foreign competitors, the US casting industry must cut manufacturing costs and reduce the time from design to market. Casting research and development (R&D) are the key to increasing US compentiveness in the casting arena. Lawrence Livermore National Laboratory (LLNL) is the home of a wide range of R&D projects that push the boundaries of state-of-the art casting. LLNL casting expertise and technology include: casting modeling research and development, including numerical simulation of fluid flow, heat transfer, reaction/solidification kinetics, and part distortion with residual stresses; special facilities to cast toxic material; extensive experience casting metals and nonmetals; advanced measurement and instrumentation systems. Department of Energy (DOE) funding provides the leverage for LLNL to collaborate with industrial partners to share this advanced casting expertise and technology. At the same time, collaboration with industrial partners provides LLNL technologists with broader insights into casting industry issues, casting process data, and the collective, experience of industry experts. Casting R&D is also an excellent example of dual-use technology; it is the cornerstone for increasing US industrial competitiveness and minimizing waste nuclear material in weapon component production. Annual funding for casting projects at LLNL is $10M, which represents 1% of the total LLNL budget. Metal casting accounts for about 80% of the funding. Funding is nearly equally divided between development directed toward US industrial competitiveness and weapon component casting.

Shapiro, A.B.; Comfort, W.J. III [eds.

1994-01-01

18

Egyptian Caste System  

NSDL National Science Digital Library

Understand the culture, character, and societal characteristics of different classes in the ancient Egyptian caste system Understand the culture, character, and societal characteristics of different classes in the ancient Egyptian caste system Go to these sites to learn about the Egyptian Caste System ...

Issen, Ms.

2009-09-17

19

OF INVESTMENT CASTS ALLOYS  

Microsoft Academic Search

Deformation and cracking of cast parts due to thermal stresses and hindered shrinkage are fre- quent casting defects. Whereas the numerical simulation of mold filling and solidification are already state of the art, applications of a thermal stress analysis are rarely found. The present study reveals how a combined thermo-mechanical model can be used for the investment casting process by

L. C. Würker; M. Fackeldey; P. R. Sahm; B. G. Thomas

20

Casting and Molding  

NSDL National Science Digital Library

This activity was designed for blind learners, but all types of learners can explore the process used to cast and mold molten metal, glass, and plastics. Using gelatin, the learner will work with a variety of molds to create castings. When the shapes are unmolded, the learner can tactually explore the casts.

Blind, Perkins S.

2012-06-26

21

Evaluation of electroslag castings  

SciTech Connect

Results of evaluations of electroslag castings of ferritic (2-1/4 Cr-1 Mo and 9 Cr-1 Mo) and austenitic (CF8M or type 316) steels are presented. The castings have been characterized for surface finish, cracking, solidification structure, chemical composition, hardness, ferrite distribution, tensile properties, Charpy impact properties, and creep properties. Pertinent data are compared with equivalent data for sand castings and wrought products of the same materials. Based on the results of these studies, the properties of electroslag castings compare favorably with those of sand castings and wrought materials.

Judkins, R.R.; Sikka, V.K.

1985-01-01

22

Advances in aluminum casting technology  

SciTech Connect

This symposium focuses on the improvements of aluminum casting quality and reliability through a better understanding of processes and process variables, and explores the latest innovations in casting-process design that allow increasing use of the castings to replace complex assemblies and heavy steel and cast-iron components in aerospace and automotive applications. Presented are 35 papers by international experts in the various aspects of the subject. The contents include: Semisolid casting; Computer-aided designing of molds and castings; Casting-process modeling; Aluminum-matrix composite castings; HIPing of castings; Progress in the US car project; Die casting and die design; and Solidification and properties.

Tiryakioglu, M.; Campbell, J. (eds.)

1998-01-01

23

Improving Metal Casting Process  

NASA Technical Reports Server (NTRS)

Don Sirois, an Auburn University research associate, and Bruce Strom, a mechanical engineering Co-Op Student, are evaluating the dimensional characteristics of an aluminum automobile engine casting. More accurate metal casting processes may reduce the weight of some cast metal products used in automobiles, such as engines. Research in low gravity has taken an important first step toward making metal products used in homes, automobiles, and aircraft less expensive, safer, and more durable. Auburn University and industry are partnering with NASA to develop one of the first accurate computer model predictions of molten metals and molding materials used in a manufacturing process called casting. Ford Motor Company's casting plant in Cleveland, Ohio is using NASA-sponsored computer modeling information to improve the casting process of automobile and light-truck engine blocks.

1998-01-01

24

Cast aluminized explosives (review)  

Microsoft Academic Search

This paper reviews the current status and future trends of aluminized explosives. The major focus is on cast compositions,\\u000a which encompass both the melt-cast trinitrotoluene (TNT) based and the slurry cast polymer-based compositions. Widely reported\\u000a RDX and HMX based aluminized compositions with TNT used as a binder are discussed in detail. Various researchers have suggested\\u000a a 15–20% Al content as

P. P. Vadhe; R. B. Pawar; R. K. Sinha; S. N. Asthana; A. Subhananda Rao

2008-01-01

25

Hickey, W8206, all casts Hickey, W8206, all casts, page 1  

E-print Network

Hickey, W8206, all casts Hickey, W8206, all casts, page 1 #12;Hickey, W8206, all casts Hickey, W8206, all casts, page 2 #12;Hickey, W8206, all casts Hickey, W8206, all casts, page 3 #12;Hickey, W8206, all casts Hickey, W8206, all casts, page 4 #12;Hickey, W8206, all casts Hickey, W8206, all casts, page

Hickey, Barbara

26

Casting in Sport  

PubMed Central

Attempts by sports medicine professionals to return high school athletes with hand and wrist injuries to competition quickly and safely have been the source of confusion and debate on many playing fields around the country. In addition to the differing views regarding the appropriateness of playing cast usage in high school football, a debate exists among sports medicine professionals as to which material is best suited for playing cast construction. Materials used in playing cast construction should be hard enough to provide sufficient stabilization to the injured area and include adequate padding to absorb blunt impact forces. The purpose of the biomechanical portion of this investigation was to attempt to determine the most appropriate materials for use in constructing playing casts for the hand and wrist by assessing different materials for: 1) hardness using a Shore durometer, and 2) ability to absorb impact using a force platform. Results revealed that RTV11 and Scotchcast were the “least hard” of the underlying casting materials and that Temper Stick foam greatly increased the ability of RTV11 to absorb impact. Assessment of the mechanical properties of playing cast materials and review of current developments in high school football rules are used to aid practitioners in choosing the most appropriate materials for playing cast construction. ImagesFig 1.Fig 2.Fig 3. PMID:16558257

DeCarlo, Mark; Malone, Kathy; Darmelio, John; Rettig, Arthur

1994-01-01

27

Clean Metal Casting  

SciTech Connect

The objective of this project is to develop a technology for clean metal processing that is capable of consistently providing a metal cleanliness level that is fit for a given application. The program has five tasks: Development of melt cleanliness assessment technology, development of melt contamination avoidance technology, development of high temperature phase separation technology, establishment of a correlation between the level of melt cleanliness and as cast mechanical properties, and transfer of technology to the industrial sector. Within the context of the first task, WPI has developed a standardized Reduced Pressure Test that has been endorsed by AFS as a recommended practice. In addition, within the context of task1, WPI has developed a melt cleanliness sensor based on the principles of electromagnetic separation. An industrial partner is commercializing the sensor. Within the context of the second task, WPI has developed environmentally friendly fluxes that do not contain fluorine. Within the context of the third task, WPI modeled the process of rotary degassing and verified the model predictions with experimental data. This model may be used to optimize the performance of industrial rotary degassers. Within the context of the fourth task, WPI has correlated the level of melt cleanliness at various foundries, including a sand casting foundry, a permanent mold casting foundry, and a die casting foundry, to the casting process and the resultant mechanical properties. This is useful in tailoring the melt cleansing operations at foundries to the particular casting process and the desired properties of cast components.

Makhlouf M. Makhlouf; Diran Apelian

2002-02-05

28

Mechanisms of stabilization of earthworm casts and artificial casts  

Microsoft Academic Search

Fresh casts were collected from the earthworm species Aporrectodea caliginosa, and artificial casts were also made. The casts were subjected to ageing, drying-rewetting, and sterilization by hexanol vapour. Clay dispersion was determined, as a measure of the lack of stability of the casts. Two soils were used, the topsoil of a recently reclaimed polder soil in the Netherlands and the

J. C. Y. Marinissen; A. R. Dexter

1990-01-01

29

New approaches in microcasting: permanent mold casting and composite casting  

Microsoft Academic Search

For several years, microcasting was based on investment casting. New approaches are now the permanent mold casting and composite\\u000a casting of micro parts. Casting was performed with aluminum bronze of the type CuAl10Ni5Fe4. Permanent mold casting was commenced with steel mold inserts in a lost mold. The development of a band heater enabled the\\u000a heating of permanent molds inside the

G. Baumeister; D. Buqezi-Ahmeti; J. Glaser; H.-J. Ritzhaupt-Kleissl

2011-01-01

30

Casting Characteristics of Aluminum Die Casting Alloys  

SciTech Connect

The research program investigates the casting characteristics of selected aluminum die casting alloys. Specifically, the alloys' tendencies towards die soldering and sludge formation, and the alloys' fluidity and machinability are evaluated. It was found that: When the Fe and Mn contents of the alloy are low; caution has to be taken against possible die soldering. When the alloy has a high sludge factor, particularly a high level of Fe, measures must be taken to prevent the formation of large hardspots. For this kind of alloy, the Fe content should be kept at its lowest allowable level and the Mn content should be at its highest possible level. If there are problems in die filling, measures other than changing the alloy chemistry need to be considered first. In terms of alloy chemistry, the elements that form high temperature compounds must be kept at their lowest allowable levels. The alloys should not have machining problems when appropriate machining techniques and machining parameters are used.

Makhlouf M. Makhlouf; Diran Apelian

2002-02-05

31

A Winning Cast  

NASA Technical Reports Server (NTRS)

Howmet Research Corporation was the first to commercialize an innovative cast metal technology developed at Auburn University, Auburn, Alabama. With funding assistance from NASA's Marshall Space Flight Center, Auburn University's Solidification Design Center (a NASA Commercial Space Center), developed accurate nickel-based superalloy data for casting molten metals. Through a contract agreement, Howmet used the data to develop computer model predictions of molten metals and molding materials in cast metal manufacturing. Howmet Metal Mold (HMM), part of Howmet Corporation Specialty Products, of Whitehall, Michigan, utilizes metal molds to manufacture net shape castings in various alloys and amorphous metal (metallic glass). By implementing the thermophysical property data from by Auburn researchers, Howmet employs its newly developed computer model predictions to offer customers high-quality, low-cost, products with significantly improved mechanical properties. Components fabricated with this new process replace components originally made from forgings or billet. Compared with products manufactured through traditional casting methods, Howmet's computer-modeled castings come out on top.

2001-01-01

32

Salvaged castings and methods of salvaging castings with defective cast cooling bumps  

DOEpatents

Castings for gas turbine parts exposed on one side to a high-temperature fluid medium have cast-in bumps on an opposite cooling surface side to enhance heat transfer. Areas on the cooling surface having defectively cast bumps, i.e., missing or partially formed bumps during casting, are coated with a braze alloy and cooling enhancement material to salvage the part.

Johnson, Robert Alan (Simpsonville, SC); Schaeffer, Jon Conrad (Greenville, SC); Lee, Ching-Pang (Cincinnati, OH); Abuaf, Nesim (Lincoln City, OR); Hasz, Wayne Charles (Pownal, VT)

2002-01-01

33

Steel castings by the electroslag casting technique. [CF8M  

SciTech Connect

ELectroslag casting facilities in Canada and the United States were reviewed. Several valve body castings of 2-1/4 Cr-1 Mo, 9 Cr-1 Mo, and 18% Cr-8% Ni(Mo) steels were made at the University of British Columbia facility. These castings were examined for surface finish, chemical segregation, and macrostructure in the as-cast condition and after various heat treatments. Castings were subjected to tensile, Charpy impact, and creep testing. Results of these tests were compared with similar data on wrought material and sand castings.

Sikka, V.K.; Mitchell, A.

1984-01-01

34

CAST FLOOR WITH VIEW OF TORPEDO LADLE (BENEATH CAST FLOOR) ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

CAST FLOOR WITH VIEW OF TORPEDO LADLE (BENEATH CAST FLOOR) AND KEEPERS OF THE CAST HOUSE FLOOR, S.L. KIMBROUGH AND DAVID HOLMES. - U.S. Steel, Fairfield Works, Blast Furnace No. 8, North of Valley Road, West of Ensley-Pleasant Grove Road, Fairfield, Jefferson County, AL

35

Hickey, C8206_all casts Hickey, C8206_all casts, page 1  

E-print Network

Hickey, C8206_all casts Hickey, C8206_all casts, page 1 #12;Hickey, C8206_all casts Hickey, C8206_all casts, page 2 #12;Hickey, C8206_all casts Hickey, C8206_all casts, page 3 #12;Hickey, C8206_all casts Hickey, C8206_all casts, page 4 #12;Hickey, C8206_all casts Hickey, C8206_all casts, page 5 #12

Hickey, Barbara

36

DIVISION 04 MASONRY 04720 CAST STONE  

E-print Network

DIVISION 04 ­ MASONRY _____________________________________________________________ 04720 CAST STONE A. Design Considerations 1. Cast stone shall comply with ASTM C1364, Standard Specification for Cast Stone. 2. Care must be taken in the design of individual units of cast stone, working within

37

Casting Of Multilayer Ceramic Tapes  

NASA Technical Reports Server (NTRS)

Procedure for casting thin, multilayer ceramic membranes, commonly called tapes, involves centrifugal casting at accelerations of 1,800 to 2,000 times normal gravitational acceleration. Layers of tape cast one at a time on top of any previous layer or layers. Each layer cast from slurry of ground ceramic suspended in mixture of solvents, binders, and other components. Used in capacitors, fuel cells, and electrolytic separation of oxygen from air.

Collins, Earl R., Jr.

1991-01-01

38

Magnesium die casting properties  

SciTech Connect

Numerous innovative applications of magnesium alloy die castings have recently been introduced by the automotive industry. This is the result of dedicated long-term development involving end users, die casters, and equipment and material suppliers. It is realized that superior product performance can only by obtained by fully exploiting the synergy of optimum design, processing route, and material selection. A particularly good example is provided by the rapid growth of magnesium die casting applications for safety parts, requiring high fracture toughness. In such applications, the favorable intrinsic properties of magnesium die casting alloys have been exploited to an extent which was formerly not believed possible. Introduction of new alloys such as AM50 has further expanded the range of properties attainable. Standard references on alloy properties do not reflect these developments, and there is a strong need for updated information. These data, reflecting recent advances in alloy chemistry and die casting technology, should be more current than those available in most sources of physical and mechanical properties.

NONE

1995-08-01

39

Cool Cast Facts  

MedlinePLUS

... may tell you to cover it with a plastic bag while you shower or you can get a special waterproof sleeve to cover it. Depending on where your cast or splint is on your body, you may find it easier to take a ...

40

Mix/Cast Contamination Control  

NASA Technical Reports Server (NTRS)

Presented is a training handbook for Mix/Cast Contamination Control; a part of a series of training courses to qualify access to Mix/Cast facilities. Contents: List Contamination Control Requirements; Identify foreign objects debris (FOD), Control Areas and their guidelines; Describe environmental monitoring; List Contamination Control Initiatives; Describe concern for Controlled Materials; Identify FOD Controlled Areas in Mix/Cast.

Wallentine, M.

2005-01-01

41

Precision cast vs. wrought superalloys  

NASA Technical Reports Server (NTRS)

While cast polycrystalline superalloys recommend themselves in virtue of better 'buy-to-fly' ratios and higher strengthening gamma-prime volume fractions than those of wrought superalloys, the expansion of their use into such critical superalloy applications as gas turbine hot section components has been slowed by insufficient casting process opportunities for microstructural control. Attention is presently drawn, however, to casting process developments facilitating the production of defect-tolerant superalloy castings having improved fracture reliability. Integrally bladed turbine wheel and thin-walled turbine exhaust case near-net-shape castings have been produced by these means.

Tien, J. K.; Borofka, J. C.; Casey, M. E.

1986-01-01

42

AMCC casting development, volume 2  

NASA Technical Reports Server (NTRS)

PCC successfully cast and performed nondestructive testing, FPI and x-ray, on seventeen AMCC castings. Destructive testing, lab analysis and chemical milling, was performed on eleven of the castings and the remaining six castings were shipped to NASA or Aerojet. Two of the six castings shipped, lots 015 and 016, were fully processed per blueprint requirements. PCC has fully developed the gating and processing parameters of this part and feels the part could be implemented into production, after four more castings have been completed to ensure the repeatability of the process. The AMCC casting has been a technically challenging part due to its size, configuration, and alloy type. The height and weight of the wax pattern assembly necessitated the development of a hollow gating system to ensure structural integrity of the shell throughout the investment process. The complexity in the jacket area of the casting required the development of an innovative casting technology that PCC has termed 'TGC' or thermal gradient control. This method of setting up thermal gradients in the casting during solidification represents a significant process improvement for PCC and has been successfully implemented on other programs. The alloy, JBK75, is a relatively new alloy in the investment casting arena and required our engineering staff to learn the gating, processing, and dimensional characteristics of the material.

1995-01-01

43

Hickey, TT162, Casts 2-5 Hickey, TT162, Casts 2-5, page 1  

E-print Network

Hickey, TT162, Casts 2-5 Hickey, TT162, Casts 2-5, page 1 CTD002 #12;Hickey, TT162, Casts 2-5 Hickey, TT162, Casts 2-5, page 2 CTD002 #12;Hickey, TT162, Casts 2-5 Hickey, TT162, Casts 2-5, page 3 CTD002 #12;Hickey, TT162, Casts 2-5 Hickey, TT162, Casts 2-5, page 4 CTD002 #12;Hickey, TT162, Casts 2

Hickey, Barbara

44

Hickey, TT136, casts 6-10 Hickey, TT136, casts 6-10, page 1  

E-print Network

Hickey, TT136, casts 6-10 Hickey, TT136, casts 6-10, page 1 CTD006 #12;Hickey, TT136, casts 6-10 Hickey, TT136, casts 6-10, page 2 CTD006 #12;Hickey, TT136, casts 6-10 Hickey, TT136, casts 6-10, page 3 CTD006 #12;Hickey, TT136, casts 6-10 Hickey, TT136, casts 6-10, page 4 CTD006 #12;Hickey, TT136, casts

Hickey, Barbara

45

Hickey, TT162, casts 6-7 Hickey, TT162, casts 6-7, page 1  

E-print Network

CTD006 Hickey, TT162, casts 6-7 Hickey, TT162, casts 6-7, page 1 #12;CTD006 Hickey, TT162, casts 6-7 Hickey, TT162, casts 6-7, page 2 #12;CTD006 Hickey, TT162, casts 6-7 Hickey, TT162, casts 6-7, page 3 #12;CTD006 Hickey, TT162, casts 6-7 Hickey, TT162, casts 6-7, page 4 #12;CTD006 Hickey, TT162, casts 6

Hickey, Barbara

46

Hickey, TT136, casts 3-5 Hickey, TT136, casts 3-5, page 1  

E-print Network

Hickey, TT136, casts 3-5 Hickey, TT136, casts 3-5, page 1 CTD003 #12;Hickey, TT136, casts 3-5 Hickey, TT136, casts 3-5, page 2 CTD003 #12;Hickey, TT136, casts 3-5 Hickey, TT136, casts 3-5, page 3 CTD003 #12;Hickey, TT136, casts 3-5 Hickey, TT136, casts 3-5, page 4 CTD003 #12;Hickey, TT136, casts 3

Hickey, Barbara

47

Melting and casting of FeAl-based cast alloy  

SciTech Connect

The FeAl-based intermetallic alloys are of great interest because of their low density, low raw material cost, and excellent resistance to high-temperature oxidation, sulfidation, carburization, and molten salts. The applications based on these unique properties of FeAl require methods to melt and cast these alloys into complex-shaped castings and centrifugal cast tubes. This paper addresses the melting-related issues and the effect of chemistry on the microstructure and hardness of castings. It is concluded that the use of the Exo-Melt{trademark} process for melting and the proper selection of the aluminum melt stock can result in porosity-free castings. The FeAl alloys can be melted and cast from the virgin and revert stock. A large variation in carbon content of the alloys is possible before the precipitation of graphite flakes occurs. Titanium is a very potent addition to refine the grain size of castings. A range of complex sand castings and two different sizes of centrifugal cast tubes of the alloy have already been cast.

Sikka, V.K. [Oak Ridge National Lab., TN (United States); Wilkening, D. [Columbia Falls Aluminum Co., Columbia Falls, MT (United States); Liebetrau, J.; Mackey, B. [AFFCO, L.L.C., Anaconda, MT (United States)

1998-11-01

48

Design for die casting  

Microsoft Academic Search

The purpose of this research was to establish methods and a system for transforming finished (machined) part designs into shapes that are die castable. The major contribution from this work is a consistent and systematic method of analysing the shape of die castings. This research is necessary because computer-aided design\\/manufacturing\\/engineering (CAD\\/CAM\\/CAE) systems are only loosely coupled, making manufacturability analysis very

S. Y. LIOU; R. A. MILLER

1991-01-01

49

Extrusion cast explosive  

DOEpatents

Improved, multiphase, high performance, high energy, extrusion cast explosive compositions, comprising, a crystalline explosive material; an energetic liquid plasticizer; a urethane prepolymer, comprising a blend of polyvinyl formal, and polycaprolactone; a polyfunctional isocyanate; and a catalyst are disclosed. These new explosive compositions exhibit higher explosive content, a smooth detonation front, excellent stability over long periods of storage, and lower sensitivity to mechanical stimulants. 1 fig.

Scribner, K.J.

1985-01-29

50

Extrusion cast explosive  

DOEpatents

Disclosed is an improved, multiphase, high performance, high energy, extrusion cast explosive compositions, comprising, a crystalline explosive material; an energetic liquid plasticizer; a urethane prepolymer, comprising a blend of polyvinyl formal, and polycaprolactone; a polyfunctional isocyanate; and a catalyst. These new explosive compositions exhibit higher explosive content, a smooth detonation front, excellent stability over long periods of storage, and lower sensitivity to mechanical stimulants. 1 fig.

Scribner, K.J.

1985-11-26

51

Metal casting extended assessments  

SciTech Connect

In 1997, the Industrial Assessment Center program of the US Department of Energy initiated Extended Assessments as an option for some of their in-plant assessments. Intended for larger, more complex manufacturing facilities, the multi-day Extended Assessment allows the plant assessment team to explore more complex recommendations with the intent of encouraging major process and equipment changes. In this paper the authors describe the results of Extended Assessments at plants in the Metal Casting Industry, one of the DOE Industries of the Future. They visited five plants, two foundries and three die casting plants, with combined annual sales of $134 million and a combined annual production volume of 35,300 tons. The recommendations offered potential savings to each plant of an average $417,000 or 1.5% of average gross sales. A number of generalizations can be observed based on the assessments in the cast metals industry. First is that many of the smaller firms in this industry have been slow to adopt innovative technology. Off the shelf technologies are available that will help these firms reach the 21st Century. The concept of remelt of metal or scrap in the plant is an operation that can be improved. They found approximately two pounds of metal melted for every pound shipped. Finally, many opportunities exist outside of the core plant operations to reduce operating costs.

Ambs, L.; Kosanovic, D.; Muller, M.; Kasten, D.

1999-07-01

52

Steel casting by diffusion solidification  

Microsoft Academic Search

A new process for casting and welding carbon steels is described in which carbon diffuses isothermally or adiabatically within\\u000a an intimate mixture of solid low carbon steel and high carbon liquid iron to effect solidification and subsequent homogenization\\u000a with respect to carbon. Advantages over conventional casting processes and products result from 1) 150 to 200°C lower casting\\u000a temperature; 2) reduced

George Langford; Robert E. Cunningham

1978-01-01

53

Fiber-Reinforced Slip Castings  

NASA Technical Reports Server (NTRS)

Addition of silica fibers greatly reduces shrinkage and cracking during casting of ceramics. Fiber-reinforced slip-cast silica ceramics are also tougher and have lower dielectric loss. Silica fibers are hyperpure material containing only 1 part per million total metal-ion impurities. Hyperpure fibers ensure high reflectance and allow casting to be fired at temperature greater than 2,200 degrees F without loss of strength from devitrification.

Blome, J. C.; Drennan, D. N.; Keeser, H. M.

1982-01-01

54

Cast dielectric composite linear accelerator  

DOEpatents

A linear accelerator having cast dielectric composite layers integrally formed with conductor electrodes in a solventless fabrication process, with the cast dielectric composite preferably having a nanoparticle filler in an organic polymer such as a thermosetting resin. By incorporating this cast dielectric composite the dielectric constant of critical insulating layers of the transmission lines of the accelerator are increased while simultaneously maintaining high dielectric strengths for the accelerator.

Sanders, David M. (Livermore, CA); Sampayan, Stephen (Manteca, CA); Slenes, Kirk (Albuquerque, NM); Stoller, H. M. (Albuquerque, NM)

2009-11-10

55

Hickey, TT162, Casts 38-47 Hickey, TT162, Casts 38-47, page 1  

E-print Network

Hickey, TT162, Casts 38-47 Hickey, TT162, Casts 38-47, page 1 CTD038 #12;Hickey, TT162, Casts 38-47 Hickey, TT162, Casts 38-47, page 2 CTD039 #12;Hickey, TT162, Casts 38-47 Hickey, TT162, Casts 38-47, page 3 CTD039 #12;Hickey, TT162, Casts 38-47 Hickey, TT162, Casts 38-47, page 4 CTD040 #12;Hickey, TT162

Hickey, Barbara

56

Hickey, TT136, casts 91-95 Hickey, TT136, casts 91-95, page 1  

E-print Network

Hickey, TT136, casts 91-95 Hickey, TT136, casts 91-95, page 1 CTD091 #12;Hickey, TT136, casts 91-95 Hickey, TT136, casts 91-95, page 2 CTD091 #12;Hickey, TT136, casts 91-95 Hickey, TT136, casts 91-95, page 3 CTD091 #12;Hickey, TT136, casts 91-95 Hickey, TT136, casts 91-95, page 4 CTD091 #12;Hickey, TT136

Hickey, Barbara

57

Hickey, TT162, Casts 73-82 Hickey, TT162, Casts 73-82, page 1  

E-print Network

Hickey, TT162, Casts 73-82 Hickey, TT162, Casts 73-82, page 1 CTD073 #12;Hickey, TT162, Casts 73-82 Hickey, TT162, Casts 73-82, page 2 CTD073 #12;Hickey, TT162, Casts 73-82 Hickey, TT162, Casts 73-82, page 3 CTD073 #12;Hickey, TT162, Casts 73-82 Hickey, TT162, Casts 73-82, page 4 CTD074 #12;Hickey, TT162

Hickey, Barbara

58

Hickey, W8201, casts 11-18 Hickey, W8201, casts 11-18, page 1  

E-print Network

Hickey, W8201, casts 11-18 Hickey, W8201, casts 11-18, page 1 CTD011 #12;Hickey, W8201, casts 11-18 Hickey, W8201, casts 11-18, page 2 CTD011 #12;Hickey, W8201, casts 11-18 Hickey, W8201, casts 11-18, page 3 CTD011 #12;Hickey, W8201, casts 11-18 Hickey, W8201, casts 11-18, page 4 CTD011 #12;Hickey, W8201

Hickey, Barbara

59

Hickey, TT162, Casts 83-87 Hickey, TT162, Casts 83-87, page 1  

E-print Network

Hickey, TT162, Casts 83-87 Hickey, TT162, Casts 83-87, page 1 CTD083 #12;Hickey, TT162, Casts 83-87 Hickey, TT162, Casts 83-87, page 2 CTD083 #12;Hickey, TT162, Casts 83-87 Hickey, TT162, Casts 83-87, page 3 CTD083 #12;Hickey, TT162, Casts 83-87 Hickey, TT162, Casts 83-87, page 4 CTD083 #12;Hickey, TT162

Hickey, Barbara

60

Hickey, TT136, casts 52-55 Hickey, TT136, casts 52-55, pager 1  

E-print Network

Hickey, TT136, casts 52-55 Hickey, TT136, casts 52-55, pager 1 CTD052 #12;Hickey, TT136, casts 52-55 Hickey, TT136, casts 52-55, pager 2 CTD052 #12;Hickey, TT136, casts 52-55 Hickey, TT136, casts 52-55, pager 3 CTD052 #12;Hickey, TT136, casts 52-55 Hickey, TT136, casts 52-55, pager 4 CTD052 #12;Hickey, TT

Hickey, Barbara

61

Hickey, TT136, casts 41-43 Hickey, TT136, casts 41-43, page 1  

E-print Network

CTD041 Hickey, TT136, casts 41-43 Hickey, TT136, casts 41-43, page 1 #12;CTD041 Hickey, TT136, casts 41-43 Hickey, TT136, casts 41-43, page 2 #12;CTD041 Hickey, TT136, casts 41-43 Hickey, TT136, casts 41-43, page 3 #12;CTD041 Hickey, TT136, casts 41-43 Hickey, TT136, casts 41-43, page 4 #12;CTD041

Hickey, Barbara

62

Hickey, TT162, Casts 56-62 Hickey, TT162, Casts 56-62, page 1  

E-print Network

Hickey, TT162, Casts 56-62 Hickey, TT162, Casts 56-62, page 1 CTD056 #12;Hickey, TT162, Casts 56-62 Hickey, TT162, Casts 56-62, page 2 CTD056 #12;Hickey, TT162, Casts 56-62 Hickey, TT162, Casts 56-62, page 3 CTD056 #12;Hickey, TT162, Casts 56-62 Hickey, TT162, Casts 56-62, page 4 CTD056 #12;Hickey, TT162

Hickey, Barbara

63

Hickey, TT136, casts 21-26 Hickey, TT136, casts 21-26, page 1  

E-print Network

Hickey, TT136, casts 21-26 Hickey, TT136, casts 21-26, page 1 CTD021 #12;Hickey, TT136, casts 21-26 Hickey, TT136, casts 21-26, page 2 CTD021 #12;Hickey, TT136, casts 21-26 Hickey, TT136, casts 21-26, page 3 CTD021 #12;Hickey, TT136, casts 21-26 Hickey, TT136, casts 21-26, page 4 CTD021 #12;Hickey, TT136

Hickey, Barbara

64

Hickey, TT136, casts 98-99 Hickey, TT136, casts 98-99, page 1  

E-print Network

Hickey, TT136, casts 98-99 Hickey, TT136, casts 98-99, page 1 CTD098 #12;Hickey, TT136, casts 98-99 Hickey, TT136, casts 98-99, page 2 CTD098 #12;Hickey, TT136, casts 98-99 Hickey, TT136, casts 98-99, page 3 CTD098 #12;Hickey, TT136, casts 98-99 Hickey, TT136, casts 98-99, page 4 CTD098 #12;Hickey, TT136

Hickey, Barbara

65

Hickey, TT136, casts 37-40 Hickey, TT136, casts 37-40, page 1  

E-print Network

CTD037 Hickey, TT136, casts 37-40 Hickey, TT136, casts 37-40, page 1 #12;CTD037 Hickey, TT136, casts 37-40 Hickey, TT136, casts 37-40, page 2 #12;CTD037 Hickey, TT136, casts 37-40 Hickey, TT136, casts 37-40, page 3 #12;CTD037 Hickey, TT136, casts 37-40 Hickey, TT136, casts 37-40, page 4 #12;CTD037

Hickey, Barbara

66

Hickey, TT136, casts 48, 49, 51 Hickey, TT136, casts 48, 49, 51, page 1  

E-print Network

Hickey, TT136, casts 48, 49, 51 Hickey, TT136, casts 48, 49, 51, page 1 CTD048 #12;Hickey, TT136, casts 48, 49, 51 Hickey, TT136, casts 48, 49, 51, page 2 CTD048 #12;Hickey, TT136, casts 48, 49, 51 Hickey, TT136, casts 48, 49, 51, page 3 CTD048 #12;Hickey, TT136, casts 48, 49, 51 Hickey, TT136, casts

Hickey, Barbara

67

Hickey, TT136, casts 27-36 Hickey, TT136, casts 27-36, page 1  

E-print Network

Hickey, TT136, casts 27-36 Hickey, TT136, casts 27-36, page 1 CTD027 #12;Hickey, TT136, casts 27-36 Hickey, TT136, casts 27-36, page 2 CTD027 #12;Hickey, TT136, casts 27-36 Hickey, TT136, casts 27-36, page 3 CTD027 #12;Hickey, TT136, casts 27-36 Hickey, TT136, casts 27-36, page 4 CTD027 #12;Hickey, TT136

Hickey, Barbara

68

Hickey, TT162, Casts 48-49 Hickey, TT162, Casts 48-49, page 1  

E-print Network

Hickey, TT162, Casts 48-49 Hickey, TT162, Casts 48-49, page 1 CTD048 #12;Hickey, TT162, Casts 48-49 Hickey, TT162, Casts 48-49, page 2 CTD048 #12;Hickey, TT162, Casts 48-49 Hickey, TT162, Casts 48-49, page 3 CTD048 #12;Hickey, TT162, Casts 48-49 Hickey, TT162, Casts 48-49, page 4 CTD048 #12;Hickey, TT162

Hickey, Barbara

69

Hickey, TT136, casts 11-20 Hickey, TT136, casts 11-20, page 1  

E-print Network

Hickey, TT136, casts 11-20 Hickey, TT136, casts 11-20, page 1 CTD011 #12;Hickey, TT136, casts 11-20 Hickey, TT136, casts 11-20, page 2 CTD011 #12;Hickey, TT136, casts 11-20 Hickey, TT136, casts 11-20, page 3 CTD012 #12;Hickey, TT136, casts 11-20 Hickey, TT136, casts 11-20, page 4 CTD013 #12;Hickey, TT136

Hickey, Barbara

70

Hickey, TT162, Casts 63-72 Hickey, TT162, Casts 63-72, page 1  

E-print Network

Hickey, TT162, Casts 63-72 Hickey, TT162, Casts 63-72, page 1 CTD063 #12;Hickey, TT162, Casts 63-72 Hickey, TT162, Casts 63-72, page 2 CTD063 #12;Hickey, TT162, Casts 63-72 Hickey, TT162, Casts 63-72, page 3 CTD063 #12;Hickey, TT162, Casts 63-72 Hickey, TT162, Casts 63-72, page 4 CTD064 #12;Hickey, TT162

Hickey, Barbara

71

Hickey, TT136, casts 56-76 Hickey, TT136, casts 56-76, page 1  

E-print Network

Hickey, TT136, casts 56-76 Hickey, TT136, casts 56-76, page 1 CTD056 #12;Hickey, TT136, casts 56-76 Hickey, TT136, casts 56-76, page 2 CTD056 #12;Hickey, TT136, casts 56-76 Hickey, TT136, casts 56-76, page 3 CTD056 #12;Hickey, TT136, casts 56-76 Hickey, TT136, casts 56-76, page 4 CTD056 #12;Hickey, TT136

Hickey, Barbara

72

Hickey, W8201, casts 26-32 Hickey, W8201, casts 26-32, page 1  

E-print Network

Hickey, W8201, casts 26-32 Hickey, W8201, casts 26-32, page 1 CTD026 #12;Hickey, W8201, casts 26-32 Hickey, W8201, casts 26-32, page 2 CTD026 #12;Hickey, W8201, casts 26-32 Hickey, W8201, casts 26-32, page 3 CTD027 #12;Hickey, W8201, casts 26-32 Hickey, W8201, casts 26-32, page 4 CTD027 #12;Hickey, W8201

Hickey, Barbara

73

Hickey, W8201, Casts 1-10 Hickey, W8201, Casts 1-10, page 1  

E-print Network

CTD001 Hickey, W8201, Casts 1-10 Hickey, W8201, Casts 1-10, page 1 #12;CTD001 Hickey, W8201, Casts 1-10 Hickey, W8201, Casts 1-10, page 2 #12;CTD002 Hickey, W8201, Casts 1-10 Hickey, W8201, Casts 1-10, page 3 #12;CTD002 Hickey, W8201, Casts 1-10 Hickey, W8201, Casts 1-10, page 4 #12;CTD003 Hickey, W8201

Hickey, Barbara

74

Hickey, TT136, casts 44-46 Hickey, TT136, casts 44-46, page 1  

E-print Network

Hickey, TT136, casts 44-46 Hickey, TT136, casts 44-46, page 1 CTD044 #12;Hickey, TT136, casts 44-46 Hickey, TT136, casts 44-46, page 2 CTD044 #12;Hickey, TT136, casts 44-46 Hickey, TT136, casts 44-46, page 3 CTD044 #12;Hickey, TT136, casts 44-46 Hickey, TT136, casts 44-46, page 4 CTD044 #12;Hickey, TT136

Hickey, Barbara

75

Hickey, TT136, casts 96-97 Hickey, TT136, casts 96-97, page 1  

E-print Network

Hickey, TT136, casts 96-97 Hickey, TT136, casts 96-97, page 1 CTD096 #12;Hickey, TT136, casts 96-97 Hickey, TT136, casts 96-97, page 2 CTD096 #12;Hickey, TT136, casts 96-97 Hickey, TT136, casts 96-97, page 3 CTD096 #12;Hickey, TT136, casts 96-97 Hickey, TT136, casts 96-97, page 4 CTD096 #12;Hickey, TT136

Hickey, Barbara

76

Hickey, TT136, casts 46-47 Hickey, TT136, casts 46-47, page 1  

E-print Network

Hickey, TT136, casts 46-47 Hickey, TT136, casts 46-47, page 1 CTD046 #12;Hickey, TT136, casts 46-47 Hickey, TT136, casts 46-47, page 2 CTD046 #12;Hickey, TT136, casts 46-47 Hickey, TT136, casts 46-47, page 3 CTD046 #12;Hickey, TT136, casts 46-47 Hickey, TT136, casts 46-47, page 4 CTD046 #12;Hickey, TT136

Hickey, Barbara

77

Hickey, TT162, Casts 88-92 Hickey, TT162, Casts 88-92, page 1  

E-print Network

Hickey, TT162, Casts 88-92 Hickey, TT162, Casts 88-92, page 1 CTD088 #12;Hickey, TT162, Casts 88-92 Hickey, TT162, Casts 88-92, page 2 CTD088 #12;Hickey, TT162, Casts 88-92 Hickey, TT162, Casts 88-92, page 3 CTD088 #12;Hickey, TT162, Casts 88-92 Hickey, TT162, Casts 88-92, page 4 CTD088 #12;Hickey, TT162

Hickey, Barbara

78

Hickey, TT162, Casts 17-24 Hickey, TT162, Casts 17-24, page 1  

E-print Network

Hickey, TT162, Casts 17-24 Hickey, TT162, Casts 17-24, page 1 CTD017 #12;Hickey, TT162, Casts 17-24 Hickey, TT162, Casts 17-24, page 2 CTD017 #12;Hickey, TT162, Casts 17-24 Hickey, TT162, Casts 17-24, page 3 CTD018 #12;Hickey, TT162, Casts 17-24 Hickey, TT162, Casts 17-24, page 4 CTD018 #12;Hickey, TT162

Hickey, Barbara

79

Hickey, TT136, casts 77-90 Hickey, TT136, casts 77-90, page 1  

E-print Network

Hickey, TT136, casts 77-90 Hickey, TT136, casts 77-90, page 1 CTD077 #12;Hickey, TT136, casts 77-90 Hickey, TT136, casts 77-90, page 2 CTD077 #12;Hickey, TT136, casts 77-90 Hickey, TT136, casts 77-90, page 3 CTD077 #12;Hickey, TT136, casts 77-90 Hickey, TT136, casts 77-90, page 4 CTD077 #12;Hickey, TT136

Hickey, Barbara

80

RAPID THICK STRIP CASTING - CONTINUOUS CASTING WITH MOVING MOULDS  

Microsoft Academic Search

Moving mould for the future… Due to mechanical reasons, conventional lubricated oscillating moulds limit the casting velocity. If the friction in the mould grows too strongly, the thin strand shell can tear, in a worst case followed by a breakout. However these constraints are not applicable to moving moulds. RTSC (Rapid Thick Strip Casting) is an innovative concept for the

R. Nagy; A. J. Hulek; D. Senk

81

COMPARISON OF FATIGUE BEHAVIOR FOR CENTRIFUGALLY CAST AND KEEL BLOCK CAST STEEL  

Microsoft Academic Search

The objective of this research was to determine if location through the wall thickness of centrifugal castings affects fatigue properties and to compare fatigue and monotonic tensile properties of centrifugal castings to statically cast keel block castings. Specimens were machined from centrifugal and keel block AISI 8630 steel castings. Centrifugal casting specimens were taken from three different locations (outer, middle

J. J. Gradman; R. I. Stephens; R. A. Hardin; C. Beckermann

82

21 CFR 888.5940 - Cast component.  

Code of Federal Regulations, 2013 CFR

...8 2013-04-01 2013-04-01 false Cast component. 888.5940 Section 888.5940...ORTHOPEDIC DEVICES Surgical Devices § 888.5940 Cast component. (a) Identification. A cast component is a device intended for medical...

2013-04-01

83

21 CFR 888.5940 - Cast component.  

Code of Federal Regulations, 2011 CFR

...8 2011-04-01 2011-04-01 false Cast component. 888.5940 Section 888.5940...ORTHOPEDIC DEVICES Surgical Devices § 888.5940 Cast component. (a) Identification. A cast component is a device intended for medical...

2011-04-01

84

21 CFR 888.5940 - Cast component.  

...8 2014-04-01 2014-04-01 false Cast component. 888.5940 Section 888.5940...ORTHOPEDIC DEVICES Surgical Devices § 888.5940 Cast component. (a) Identification. A cast component is a device intended for medical...

2014-04-01

85

21 CFR 888.5940 - Cast component.  

Code of Federal Regulations, 2012 CFR

...8 2012-04-01 2012-04-01 false Cast component. 888.5940 Section 888.5940...ORTHOPEDIC DEVICES Surgical Devices § 888.5940 Cast component. (a) Identification. A cast component is a device intended for medical...

2012-04-01

86

21 CFR 888.5940 - Cast component.  

Code of Federal Regulations, 2010 CFR

...8 2010-04-01 2010-04-01 false Cast component. 888.5940 Section 888.5940...ORTHOPEDIC DEVICES Surgical Devices § 888.5940 Cast component. (a) Identification. A cast component is a device intended for medical...

2010-04-01

87

Lost-Soap Aluminum Casting.  

ERIC Educational Resources Information Center

Lost-wax casting in sterling silver is a costly experience for the average high school student. However, this jewelry process can be learned at no cost if scrap aluminum is used instead of silver, and soap bars are used instead of wax. This lost-soap aluminum casting process is described. (Author/KC)

Mihalow, Paula

1980-01-01

88

Surface carburization of steel castings  

Microsoft Academic Search

Shaping methods based on sand-resin mixtures have undoubted benefits and accordingly are increas? ingly used in the manufacture of highperformance iron, steel, and nonferrousalloy castings. However, they cannot be unconditionally recommended for lowcarbon steel castings. This is because heat from the molten metal destroys the organic components present in such molds. At low temperatures (150 °C), these mixtures mainly emit

E. B. Ten; O. A. Kol’; I. B. Badmazhapova; M. P. Klyuev

2011-01-01

89

Friction drilling of cast metals  

Microsoft Academic Search

This study investigates the friction drilling process, a nontraditional hole-making technique, for cast metals. In friction drilling, a rotating conical tool is applied to penetrate work-material and create a bushing in a single step without generating chip. The cast aluminum and magnesium alloys, two materials studied, are brittle compared to the ductile metal workpiece material used in previous friction drilling

Scott F. Miller; Jia Tao; Albert J. Shih

2006-01-01

90

Electroslag component casting. [Nickel aluminide  

SciTech Connect

This project is directed toward the development of electroslag-casting (ESC) technology for use in coal conversion components such as valve bodies, pump housings, and pipe fittings. The aim is also to develop a sufficient data base to permit electroslag casting to become an ASME Code-accepted process. It is also intended to transfer the ESC process technology to private industry. A total of 32 electroslag castings of 2.25Cr-1Mo, 9Cr-1Mo, type 316, and nickel aluminide were procured from four facilities for evaluation (Table 1). The most complex castings procured during this program were the valve bodies shown in Figure 2. The castings were subjected to various heat treatments (Table 2), checked for chemical composition uniformity from top to bottom, and subjected to macrostructural evaluation and mechanical properties testing. Results are discussed. 10 refs., 7 figs., 3 tabs.

Sikka, V.K.

1986-01-01

91

An evaluation of fiberglass cast application techniques.  

PubMed

Cylindrical casts constructed from 2, 3, 4, and 5 inch widths of fiberglass casting material were evaluated for strength in bending using an unstable fracture model. Five-inch casting material produced the strongest casts. The effect of longitudinal splinting with 2-inch fiberglass tape was evaluated in cylindrical casts constructed from 4-inch tape. Casts with splints on the compression side or with splints on both the tension and compression sides were stronger in bending than casts with a single splint on the tension side or casts without splints. PMID:7778250

Wilson, D G; Vanderby, R

1995-01-01

92

Instant Casting Movie Theater: The Future Cast System  

NASA Astrophysics Data System (ADS)

We have developed a visual entertainment system called “Future Cast” which enables anyone to easily participate in a pre-recorded or pre-created film as an instant CG movie star. This system provides audiences with the amazing opportunity to join the cast of a movie in real-time. The Future Cast System can automatically perform all the processes required to make this possible, from capturing participants' facial characteristics to rendering them into the movie. Our system can also be applied to any movie created using the same production process. We conducted our first experimental trial demonstration of the Future Cast System at the Mitsui-Toshiba pavilion at the 2005 World Exposition in Aichi Japan.

Maejima, Akinobu; Wemler, Shuhei; Machida, Tamotsu; Takebayashi, Masao; Morishima, Shigeo

93

Slip-Cast Superconductive Parts  

NASA Technical Reports Server (NTRS)

Complex shapes fabricated without machining. Nonaqueous slip-casting technique used to form complexly shaped parts from high-temperature superconductive materials like YBa(2)Cu(3)O(7-delta). Such parts useful in motors, vibration dampers, and bearings. In process, organic solvent used as liquid medium. Ceramic molds made by lost-wax process used instead of plaster-of-paris molds, used in aqueous slip-casting but impervious to organic solvents and cannot drain away liquid medium. Organic-solvent-based castings do not stick to ceramic molds as they do to plaster molds.

Wise, Stephanie A.; Buckley, John D.; Vasquez, Peter; Buck, Gregory M.; Hicks, Lana P.; Hooker, Matthew W.; Taylor, Theodore D.

1993-01-01

94

Hickey -TT174, casts 1 to cast 11 Cruise cast lat (dd.mm.m) lon(dd.mm.m) Date/Time (MMDDYYHHMM) Total Scan  

E-print Network

Hickey -TT174, casts 1 to cast 11 Cruise cast lat (dd.mm.m) lon(dd.mm.m) Date/Time (MMDDYYHHMM;Hickey -TT174, casts 1 to cast 11 Cruise cast lat (dd.mm.m) lon(dd.mm.m) Date/Time (MMDDYYHHMM) Total -TT174, casts 1 to cast 11 Cruise cast lat (dd.mm.m) lon(dd.mm.m) Date/Time (MMDDYYHHMM) Total Scan

Hickey, Barbara

95

Titanium investiment casting defects: A metallographic overview  

Microsoft Academic Search

Although titanium castings have been used in aerospace structures for decades, those uses have largely been in secondary applications. Expanding the use of titanium castings in critical applications would be encouraged by a better understanding of investment casting defects in titanium alloy systems. This paper describes several types of casting-related defects that are identified as potentially affecting the design life

J. D. Cotton; L. P. Clark; H. R. Phelps

2006-01-01

96

Simulation of Dimensional Changes in Steel Casting  

E-print Network

Simulation of Dimensional Changes in Steel Casting Shouzhu (Hans) Ou and Christoph Beckermann Pattern allowances in casting of steel are predicted using the casting simulation software MAGMASOFT casting due to thermal effects (temperature differences) and volume changes (e.g., shrinkage, sand

Beckermann, Christoph

97

Pre-Cast Gel Electrophoresis Guide  

E-print Network

Novex® Pre-Cast Gel Electrophoresis Guide Version B January 27, 2003 IM-1002 Novex® Pre-Cast Gel Electrophoresis Guide General information and protocols for using Novex® pre-cast gels www.invitrogen.com tech.....................................................................................................................1 Novex® Pre-Cast Gels

Kirschner, Marc W.

98

Hickey -TT136 casts 1-2 Hickey -TT136,Casts 1-2, page 1  

E-print Network

Hickey -TT136 casts 1-2 Hickey -TT136,Casts 1-2, page 1 CTD001 #12;Hickey -TT136 casts 1-2 Hickey -TT136,Casts 1-2, page 2 CTD001 #12;Hickey -TT136 casts 1-2 Hickey -TT136,Casts 1-2, page 3 CTD001 #12;Hickey -TT136 casts 1-2 Hickey -TT136,Casts 1-2, page 4 CTD001 #12;Hickey -TT136 casts 1-2 Hickey -TT136

Hickey, Barbara

99

Casting Using A Polystyrene Pattern  

NASA Technical Reports Server (NTRS)

New technique for making metal aircraft models saves significant amount of time and effort in comparison with conventional lost-wax method. Produces inexpensive, effective wind-tunnel models. Metal wind-tunnel model cast by use of polystyrene pattern.

Vasquez, Peter; Guenther, Bengamin; Vranas, Thomas; Veneris, Peter; Joyner, Michael

1993-01-01

100

Investment casting design of experiment. Final report  

SciTech Connect

Specific steps in the investment casting process were analyzed in a designed experiment. The casting`s sensitivity to changes in these process steps was experimentally determined Dimensional and radiographic inspection were used to judge the sensitivity of the casting. Thirty-six castings of different pedigrees were poured and measured. Some of the dimensional inspection was conducted during the processing. It was confirmed that wax fixturing, number of gates, gate location, pour and mold temperature, pour speed, and cooling profile all affected the radiographic quality of the casting. Gate and runner assembly techniques, number of gates, and mold temperature affect the dimensional quality of the casting.

Owens, R.

1997-10-01

101

Titan Casts Revealing Shadow  

NASA Astrophysics Data System (ADS)

A rare celestial event was captured by NASA's Chandra X-ray Observatory as Titan -- Saturn's largest moon and the only moon in the Solar System with a thick atmosphere -- crossed in front of the X-ray bright Crab Nebula. The X-ray shadow cast by Titan allowed astronomers to make the first X-ray measurement of the extent of its atmosphere. On January 5, 2003, Titan transited the Crab Nebula, the remnant of a supernova explosion that was observed to occur in the year 1054. Although Saturn and Titan pass within a few degrees of the Crab Nebula every 30 years, they rarely pass directly in front of it. "This may have been the first transit of the Crab Nebula by Titan since the birth of the Crab Nebula," said Koji Mori of Pennsylvania State University in University Park, and lead author on an Astrophysical Journal paper describing these results. "The next similar conjunction will take place in the year 2267, so this was truly a once in a lifetime event." Animation of Titan's Shadow on Crab Nebula Animation of Titan's Shadow on Crab Nebula Chandra's observation revealed that the diameter of the X-ray shadow cast by Titan was larger than the diameter of its solid surface. The difference in diameters gives a measurement of about 550 miles (880 kilometers) for the height of the X-ray absorbing region of Titan's atmosphere. The extent of the upper atmosphere is consistent with, or slightly (10-15%) larger, than that implied by Voyager I observations made at radio, infrared, and ultraviolet wavelengths in 1980. "Saturn was about 5% closer to the Sun in 2003, so increased solar heating of Titan may account for some of this atmospheric expansion," said Hiroshi Tsunemi of Osaka University in Japan, one of the coauthors on the paper. The X-ray brightness and extent of the Crab Nebula made it possible to study the tiny X-ray shadow cast by Titan during its transit. By using Chandra to precisely track Titan's position, astronomers were able to measure a shadow one arcsecond in diameter, which corresponds to the size of a dime as viewed from about two and a half miles. Illustration of Crab, Titan's Shadow and Chandra Illustration of Crab, Titan's Shadow and Chandra Unlike almost all of Chandra's images which are made by focusing X-ray emission from cosmic sources, Titan's X-ray shadow image was produced in a manner similar to a medical X-ray. That is, an X-ray source (the Crab Nebula) is used to make a shadow image (Titan and its atmosphere) that is recorded on film (Chandra's ACIS detector). Titan's atmosphere, which is about 95% nitrogen and 5% methane, has a pressure near the surface that is one and a half times the Earth's sea level pressure. Voyager I spacecraft measured the structure of Titan's atmosphere at heights below about 300 miles (500 kilometers), and above 600 miles (1000 kilometers). Until the Chandra observations, however, no measurements existed at heights in the range between 300 and 600 miles. Understanding the extent of Titan's atmosphere is important for the planners of the Cassini-Huygens mission. The Cassini-Huygens spacecraft will reach Saturn in July of this year to begin a four-year tour of Saturn, its rings and its moons. The tour will include close flybys of Titan that will take Cassini as close as 600 miles, and the launching of the Huygens probe that will land on Titan's surface. Chandra's X-ray Shadow of Titan Chandra's X-ray Shadow of Titan "If Titan's atmosphere has really expanded, the trajectory may have to be changed." said Tsunemi. The paper on these results has been accepted and is expected to appear in a June 2004 issue of The Astrophysical Journal. Other members of the research team were Haroyoski Katayama (Osaka University), David Burrows and Gordon Garmine (Penn State University), and Albert Metzger (JPL). Chandra observed Titan from 9:04 to 18:46 UT on January 5, 2003, using its Advanced CCD Imaging Spectrometer instrument. NASA's Marshall Space Flight Center, Huntsville, Ala., manages the Chandra program for the Office of Space Science, NASA Headquarters,

2004-05-01

102

Fillability of Thin-Wall Steel Castings  

SciTech Connect

The use of steel components is being challenged by lighter nonferrous or cast iron components. The development of techniques for enhancing and ensuring the filability of thin-wall mold cavities is most critical for thinner wall cast steel production. The purpose of this research was to develop thin-wall casting techniques that can be used to reliably produce thin-wall castings from traditional gravity poured sand casting processes. The focus of the research was to enhance the filling behavior to prevent misrunds. Experiments were conducted to investigate the influence of various foundry variables on the filling of thin section steel castings. These variables include casting design, heat transfer, gating design, and metal fluidity. Wall thickness and pouring temperature have the greatest effect on casting fill. As wall thickness increases the volume to surface area of the casting increases, which increases the solidification time, allowing the metal to flow further in thicker sect ions. Pouring time is another significant variable affecting casting fill. Increases or decreases of 20% in the pouring time were found to have a significant effect on the filling of thin-wall production castings. Gating variables, including venting, pouring head height, and mold tilting also significantly affected thin-wall casting fill. Filters offer less turbulent, steadier flow, which is appropriate for thicker castings, but they do not enhance thin-wall casting fill.

Robert C. Voigt; Joseph Bertoletti; Andrew Kaley; Sandi Ricotta; Travis Sunday

2002-07-30

103

CTD021Hickey, W8101_casts 21-23 Hickey, W8101_casts 21-23, page 1  

E-print Network

CTD021Hickey, W8101_casts 21-23 Hickey, W8101_casts 21-23, page 1 #12;CTD021Hickey, W8101_casts 21-23 Hickey, W8101_casts 21-23, page 2 #12;CTD021Hickey, W8101_casts 21-23 Hickey, W8101_casts 21-23, page 3 #12;CTD021Hickey, W8101_casts 21-23 Hickey, W8101_casts 21-23, page 4 #12;CTD021Hickey, W8101_casts 21

Hickey, Barbara

104

CTD023Hickey, W8201_casts 23-25 Hickey, W8201_casts 23-25, page 1  

E-print Network

CTD023Hickey, W8201_casts 23-25 Hickey, W8201_casts 23-25, page 1 #12;CTD023Hickey, W8201_casts 23-25 Hickey, W8201_casts 23-25, page 2 #12;CTD023Hickey, W8201_casts 23-25 Hickey, W8201_casts 23-25, page 3 #12;CTD023Hickey, W8201_casts 23-25 Hickey, W8201_casts 23-25, page 4 #12;CTD023Hickey, W8201_casts 23

Hickey, Barbara

105

CTD019Hickey, W8201_casts 19-22 Hickey, W8201_casts 19-22, page 1  

E-print Network

CTD019Hickey, W8201_casts 19-22 Hickey, W8201_casts 19-22, page 1 #12;CTD019Hickey, W8201_casts 19-22 Hickey, W8201_casts 19-22, page 2 #12;CTD019Hickey, W8201_casts 19-22 Hickey, W8201_casts 19-22, page 3 #12;CTD019Hickey, W8201_casts 19-22 Hickey, W8201_casts 19-22, page 4 #12;CTD019Hickey, W8201_casts 19

Hickey, Barbara

106

Magnesium-lithium casting alloys  

NASA Technical Reports Server (NTRS)

The strength properties of magnesium-lithium alloys at room, low, and high temperatures are investigated. It is found that the alloys may have practical application at ambient temperatures up to 100 C, that negative temperatures have a favorable influence on the alloy strength, and that cyclic temperature variations have practically no effect on the strength characteristics. The influence of chemical coatings on corrosion resistance of the MgLi alloys is examined. Several facilities based on pressure casting machines, low-pressure casting machines, and magnetodynamic pumps were designed for producing MgLi alloy castings. Results were obtained for MgLi alloys reinforced with fibers having a volumetric content of 15%.

Latenko, V. P.; Silchenko, T. V.; Tikhonov, V. A.; Maltsev, V. P.; Korablin, V. P.

1974-01-01

107

CAST results and Axion review  

E-print Network

We present results from the CERN Axion Solar Telescope (CAST) and the Axion Dark Matter eXperiment (ADMX), together with a brief review on prospects on Axion searches with a variety of experimental techniques. CAST has explored masses up to 0.64 eV setting the most stringent limit on the axion-photon coupling, apart for the micro-eV region where ADMX is the most competitive experiment. CAST is aiming at surpassing the 1eV WMAP upper limit and possibly revisiting the operation in vacuum with extra sensitive X-ray detectors, while ADMX, using improved extra sensitive SQUID amplifiers will explore the micro-eV mass range.

T. Geralis; for the CAST collaboration

2009-05-26

108

Energy Consumption of Die Casting Operations  

SciTech Connect

Molten metal processing is inherently energy intensive and roughly 25% of the cost of die-cast products can be traced to some form of energy consumption [1]. The obvious major energy requirements are for melting and holding molten alloy in preparation for casting. The proper selection and maintenance of melting and holding equipment are clearly important factors in minimizing energy consumption in die-casting operations [2]. In addition to energy consumption, furnace selection also influences metal loss due to oxidation, metal quality, and maintenance requirements. Other important factors influencing energy consumption in a die-casting facility include geographic location, alloy(s) cast, starting form of alloy (solid or liquid), overall process flow, casting yield, scrap rate, cycle times, number of shifts per day, days of operation per month, type and size of die-casting form of alloy (solid or liquid), overall process flow, casting yield, scrap rate, cycle times, number of shifts per day, days of operation per month, type and size of die-casting machine, related equipment (robots, trim presses), and downstream processing (machining, plating, assembly, etc.). Each of these factors also may influence the casting quality and productivity of a die-casting enterprise. In a die-casting enterprise, decisions regarding these issues are made frequently and are based on a large number of factors. Therefore, it is not surprising that energy consumption can vary significantly from one die-casting enterprise to the next, and within a single enterprise as function of time.

Jerald Brevick; clark Mount-Campbell; Carroll Mobley

2004-03-15

109

Cast-a-Box: Casting Conditions and Macroporosity  

NSDL National Science Digital Library

An illustration of three-dimensional finite difference simulation of heat conduction with phase change and complex boundary conditions, this requires students to adjust boundary conditions to make the top surface of a regular hexahedral "casting" to freeze last, eliminating macroporosity.

Powell, Adam C., IV

2004-08-24

110

14 CFR 25.621 - Casting factors.  

Code of Federal Regulations, 2010 CFR

...DEPARTMENT OF TRANSPORTATION AIRCRAFT AIRWORTHINESS STANDARDS: TRANSPORT...castings except castings that are pressure tested as parts of hydraulic or...supports and attachments, and cabin pressure valves. (d) Noncritical...

2010-01-01

111

14 CFR 25.621 - Casting factors.  

Code of Federal Regulations, 2013 CFR

...DEPARTMENT OF TRANSPORTATION AIRCRAFT AIRWORTHINESS STANDARDS: TRANSPORT...castings except castings that are pressure tested as parts of hydraulic or...supports and attachments, and cabin pressure valves. (d) Noncritical...

2013-01-01

112

14 CFR 25.621 - Casting factors.  

Code of Federal Regulations, 2011 CFR

...DEPARTMENT OF TRANSPORTATION AIRCRAFT AIRWORTHINESS STANDARDS: TRANSPORT...castings except castings that are pressure tested as parts of hydraulic or...supports and attachments, and cabin pressure valves. (d) Noncritical...

2011-01-01

113

14 CFR 23.621 - Casting factors.  

Code of Federal Regulations, 2011 CFR

...DEPARTMENT OF TRANSPORTATION AIRCRAFT AIRWORTHINESS STANDARDS: NORMAL...castings except castings that are pressure tested as parts of hydraulic or...supports and attachments, and cabin pressure valves. (d)...

2011-01-01

114

14 CFR 23.621 - Casting factors.  

Code of Federal Regulations, 2012 CFR

...DEPARTMENT OF TRANSPORTATION AIRCRAFT AIRWORTHINESS STANDARDS: NORMAL...castings except castings that are pressure tested as parts of hydraulic or...supports and attachments, and cabin pressure valves. (d)...

2012-01-01

115

14 CFR 25.621 - Casting factors.  

Code of Federal Regulations, 2012 CFR

...DEPARTMENT OF TRANSPORTATION AIRCRAFT AIRWORTHINESS STANDARDS: TRANSPORT...castings except castings that are pressure tested as parts of hydraulic or...supports and attachments, and cabin pressure valves. (d) Noncritical...

2012-01-01

116

14 CFR 23.621 - Casting factors.  

Code of Federal Regulations, 2010 CFR

...DEPARTMENT OF TRANSPORTATION AIRCRAFT AIRWORTHINESS STANDARDS: NORMAL...castings except castings that are pressure tested as parts of hydraulic or...supports and attachments, and cabin pressure valves. (d)...

2010-01-01

117

14 CFR 23.621 - Casting factors.  

Code of Federal Regulations, 2013 CFR

...DEPARTMENT OF TRANSPORTATION AIRCRAFT AIRWORTHINESS STANDARDS: NORMAL...castings except castings that are pressure tested as parts of hydraulic or...supports and attachments, and cabin pressure valves. (d)...

2013-01-01

118

AcademiCast Transcript Texas Tech University  

E-print Network

AcademiCast Transcript Texas Tech University March 13, 2013 Pierce: This is AcademiCast--Texas Tech University's podcast series from the Office of the Provost as its candidate to lead the university. Nellis currently serves as president

Rock, Chris

119

AcademiCast Transcript Texas Tech University  

E-print Network

of about $330,000. The university's National Wind Institute has also attractedAcademiCast Transcript Texas Tech University August 30, 2013 Pierce: This is AcademiCast--Texas Tech University's podcast series from the Office of the Provost

Rock, Chris

120

Properties of electroslag castings: Part 1  

SciTech Connect

This part of several reports to be published on the properties of electroslag castings of 2 1/4 Cr-1 Mo, 9 Cr-1 Mo, and type 316 stainless steel describes the properties of three electroslag-cast valve bodies of type 316 stainless steel. These castings were electroslag cast at the University of British Columbia in Canada from ORNL-supplied electrodes. The castings have been characterized for surface finish, cracking, solidification structure, chemical analysis, hardness, ferrite distribution, tensile properties, Charpy impact properties, and creep properties. Tensile data on these castings were compared with the American Society of Mechanical Engineers (ASME) code minimum values for sand castings. The creep data were compared with the data on sand castings and the ASME code minimum curve for wrought material. 29 figures, 7 tables.

Sikka, V.K.

1984-11-01

121

When Your Child Needs a Cast  

MedlinePLUS

... by an orthopedic specialist. Continue Before Getting a Cast For displaced fractures, the bone will need to ... should adjust a splint. Back Continue Short-Term Cast Care The area around the break will probably ...

122

INTERIOR VIEW WITH CASTING MACHINE AND A 4" DUCTILE IRON ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

INTERIOR VIEW WITH CASTING MACHINE AND A 4" DUCTILE IRON PIPE BEING EXTRACTED FROM CASTING MACHINE - McWane Cast Iron Pipe Company, Pipe Casting Area, 1201 Vanderbilt Road, Birmingham, Jefferson County, AL

123

INTERIOR VIEW WITH CASTING MACHINE COOLING A 20' IRON PIPE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

INTERIOR VIEW WITH CASTING MACHINE COOLING A 20' IRON PIPE PRIOR TO EXTRACTION FROM CASTING MACHINE. - McWane Cast Iron Pipe Company, Pipe Casting Area, 1201 Vanderbilt Road, Birmingham, Jefferson County, AL

124

INTERIOR VIEW WITH CASTING MACHINE AND A 4' DUCTILE IRON ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

INTERIOR VIEW WITH CASTING MACHINE AND A 4' DUCTILE IRON PIPE BEING CENTRIFUGALLY CAST, AS OPERATOR WATCHES TO ENSURE QUALITY. - McWane Cast Iron Pipe Company, Pipe Casting Area, 1201 Vanderbilt Road, Birmingham, Jefferson County, AL

125

New fibreglass casting system in orthopaedic practice.  

PubMed

The composition, manufacture and application of a new fibreglass casting system for use in orthopaedic practice are described. The performance of the first 51 fibreglass casts used in routine fracture work is reviewed. The advantages (the cast is waterprof, extremely light and strong) and the disadvantages (an ultraviolet light source is required to cure the cast and the fiberglass tape is rather expensive) are evaluated. PMID:979766

Davis, B; Dooley, B

1976-06-26

126

Die casting process optimization using Taguchi methods  

Microsoft Academic Search

This paper analyzes various significant process parameters of the die casting method of AlSi9Cu13 aluminum alloy. An attempt has been made to obtain optimal settings of the die casting parameters, in order to yield the optimum casting density of the AlSi9Cu13 aluminum alloy castings. The process parameters considered were: piston velocity (first and second stage), metal temperature, filling time and

G. P. Syrcos

2003-01-01

127

Titanium investiment casting defects: A metallographic overview  

Microsoft Academic Search

Although titanium castings have been used in aerospace structures for decades, those uses have largely been in secondary applications.\\u000a Expanding the use of titanium castings in critical applications would be encouraged by a better understanding of investment\\u000a casting defects in titanium alloy systems. This paper describes several types of casting-related defects that are identified\\u000a as potentially affecting the design life

J. D. Cotton; L. P. Clark; H. R. Phelps

2006-01-01

128

ATTEN ATTEN Hickey, W8101, casts 1-10  

E-print Network

ATTEN ATTEN Hickey, W8101, casts 1-10 Hickey, W8101, casts 1-10, page 1 #12;Hickey, W8101, casts 1-10 Hickey, W8101, casts 1-10, page 2 #12;Hickey, W8101, casts 1-10 Hickey, W8101, casts 1-10, page 3 #12;ATTEN ATTEN Hickey, W8101, casts 1-10 Hickey, W8101, casts 1-10, page 4 #12;ATTEN ATTEN Hickey, W8101

Hickey, Barbara

129

Modified hygroscopic gold casting technique.  

PubMed

A modified hygrosopic gold casting technique has been described. It utilizes a dual-wax pattern with controlled amounts of water added to the setting investment to better influence both the location and amount of investment expansion. This technique has been used since 1970 with excellent clinical results. PMID:1090728

Cecconi, B T; Asgar, K

1975-02-01

130

The CAST time projection chamber  

NASA Astrophysics Data System (ADS)

One of the three x-ray detectors of the CERN Axion Solar Telescope (CAST) experiment searching for solar axions is a time projection chamber (TPC) with a multi-wire proportional counter (MWPC) as a readout structure. Its design has been optimized to provide high sensitivity to the detection of the low intensity x-ray signal expected in the CAST experiment. A low hardware threshold of 0.8 keV is set to a safe level during normal data taking periods, and the overall efficiency for the detection of photons coming from conversion of solar axions is 62%. Shielding has been installed around the detector, lowering the background level to 4.10 × 10-5 counts cm-2 s-1 keV-1 between 1 and 10 keV. During phase I of the CAST experiment the TPC has provided robust and stable operation, thus contributing with a competitive result to the overall CAST limit on axion photon coupling and mass.

Autiero, D.; Beltrán, B.; Carmona, J. M.; Cebrián, S.; Chesi, E.; Davenport, M.; Delattre, M.; Di Lella, L.; Formenti, F.; Irastorza, I. G.; Gómez, H.; Hasinoff, M.; Lakic, B.; Luzón, G.; Morales, J.; Musa, L.; Ortiz, A.; Placci, A.; Rodrigurez, A.; Ruz, J.; Villar, J. A.; Zioutas, K.

2007-06-01

131

Overview of ToxCast?  

EPA Science Inventory

In 2007, EPA launched ToxCast? in order to develop a cost-effective approach for prioritizing the toxicity testing of large numbers of chemicals in a short period of time. Using data from state-of-the-art high throughput screening (HTS) bioassays developed in the pharmaceutical i...

132

Tape casting of magnesium oxide.  

SciTech Connect

A tape casting procedure for fabricating ceramic magnesium oxide tapes has been developed as a method to produce flat sheets of sintered MgO that are thin and porous. Thickness of single layer tapes is in the range of 200-400 {micro}m with corresponding surface roughness values in the range of 10-20 {micro}m as measured by laser profilometry. Development of the tape casting technique required optimization of pretreatment for the starting magnesium oxide (MgO) powder as well as a detailed study of the casting slurry preparation and subsequent heat treatments for sintering and final tape flattening. Milling time of the ceramic powder, plasticizer, and binder mixture was identified as a primary factor affecting surface morphology of the tapes. In general, longer milling times resulted in green tapes with a noticeably smoother surface. This work demonstrates that meticulous control of the entire tape casting operation is necessary to obtain high-quality MgO tapes.

Ayala, Alicia; Corral, Erica L.; Loehman, Ronald E.; Bencoe, Denise Nora; Reiterer, Markus; Shah, Raja A.

2008-02-01

133

ENVIRONMENTAL ASSESSMENT OF IRON CASTING  

EPA Science Inventory

Sampling of ductile iron casting in green sand molds with phenolic isocyanate cores and in phenol-formaldehyde bound shell molds did not provide definitive proof that environmentally hazardous organic emission occur. Both molding systems produced the same type of major emissions,...

134

Prediction of Microporosity in Shrouded Impeller Castings  

SciTech Connect

The purpose of this Cooperative Research and Development Agreement (CRADA) between the Oak Ridge National Laboratory (ORNL) and Morris Bean and Company was to link computer models of heat and fluid flow with previously developed quality criteria for the prediction of microporosity in a Al-4.5% Cu alloy shrouded impeller casting. The results may be used to analyze the casting process design for the commercial production of 206 o alloy shrouded impeller castings. Test impeller castings were poured in the laboratory for the purpose of obtaining thermal data and porosity distributions. Also, a simulation of the test impeller casting was conducted and the results validated with porosity measurements on the test castings. A comparison of the predicted and measured microporosity distributions indicated an excellent correlation between experiments and prediction. The results of the experimental and modeling studies undertaken in this project indicate that the quality criteria developed for the prediction of microporosity in Al-4.5% Cu alloy castings can accurately predict regions of elevated microporosity even in complex castings such as the shrouded impeller casting. Accordingly, it should be possible to use quality criteria for porosity prediction in conjunction with computer models of heat and fluid flow to optimize the casting process for the production of shrouded impeller castings. Since high levels of microporosity may be expected to result in poor fatigue properties, casting designs that are optimized for low levels of microporosity should exhibit superior fatigue life.

Viswanathan, S. Nelson, C.D.

1998-09-01

135

Chimerical categories: caste, race, and genetics.  

PubMed

Is discrimination based on caste equivalent to racism? This paper explores the complex relationship between genetic, race and caste. It also discusses the debate over the exclusion of a discussion of caste-based discrimination at the 2001 World Conference against Racism, Racial Discrimination, Xenophobia and Related Intolerance held in Durban, South Africa. PMID:14768649

Sabir, Sharjeel

2003-12-01

136

Research of semi solid casting of iron  

Microsoft Academic Search

One result of the research on semi solid casting of iron is the development of parts having qualities that combine the superior material properties of ferrous alloy with the dimensional accuracy of aluminum die-cast parts. Iron material composition, molding methods using optimal billet heating speeds and copper die materials and methods for the continuous casting of raw material billets were

Masayuki Tsuchiya; Hiroaki Ueno; Isamu Takagi

2003-01-01

137

21 CFR 880.6185 - Cast cover.  

Code of Federal Regulations, 2011 CFR

... 8 2011-04-01 2011-04-01 false Cast cover. 880.6185 Section 880.6185 Food...Personal Use Miscellaneous Devices § 880.6185 Cast cover. (a) Identification. A cast cover is a device intended for medical...

2011-04-01

138

A Microbiological Study of Earthworm Casts  

Microsoft Academic Search

SUMMARY Microbiological, physical and chemical changes were followed in worm casts ageing in the field. Filamentous fungi and yeasts increased in number rapidly after the cast was produced, but not bacteria or actinomycetes which were initially numerous. Measurements of hyphal length confirmed the increased growth of fungi. Ageing casts showed a declining respiratory activity, possibly because the bacteria formed resting

J. N. Parle

1963-01-01

139

Master thesis Supercooled Simultaneous Composite Casting  

E-print Network

I Master thesis Supercooled Simultaneous Composite Casting for Microstructure Refinement of AlloySimultaneousCompositeCastingforMicrostructureRefinementofAlloy2008Kim,YongKi #12;3 SupercooledSimultaneousCompositeCasting for Microstructure Refinement of Alloy #12;4 Supercooled Simultaneous Composite Casting for Microstructure Refinement of Alloy by Kim

Cambridge, University of

140

21 CFR 880.6185 - Cast cover.  

Code of Federal Regulations, 2012 CFR

... 8 2012-04-01 2012-04-01 false Cast cover. 880.6185 Section 880.6185 Food...Personal Use Miscellaneous Devices § 880.6185 Cast cover. (a) Identification. A cast cover is a device intended for medical...

2012-04-01

141

21 CFR 880.6185 - Cast cover.  

... 8 2014-04-01 2014-04-01 false Cast cover. 880.6185 Section 880.6185 Food...Personal Use Miscellaneous Devices § 880.6185 Cast cover. (a) Identification. A cast cover is a device intended for medical...

2014-04-01

142

21 CFR 880.6185 - Cast cover.  

Code of Federal Regulations, 2010 CFR

... 8 2010-04-01 2010-04-01 false Cast cover. 880.6185 Section 880.6185 Food...Personal Use Miscellaneous Devices § 880.6185 Cast cover. (a) Identification. A cast cover is a device intended for medical...

2010-04-01

143

Coping with type casts in C  

Microsoft Academic Search

The use of type casts is pervasive in C. Although casts provide great flexibility in writing programs, their use obscures the meaning of programs, and can present obstacles during maintenance. Casts involving pointers to structures (C structs) are particularly problematic, because by using them, a programmer can interpret any memory region to be of any desired type, thereby compromising C's

Michael Siffr; Satish Chandra; Thomas Ball; Krishna Kunchithapadam; Thomas W. Reps

1999-01-01

144

21 CFR 880.6185 - Cast cover.  

Code of Federal Regulations, 2013 CFR

... 8 2013-04-01 2013-04-01 false Cast cover. 880.6185 Section 880.6185 Food...Personal Use Miscellaneous Devices § 880.6185 Cast cover. (a) Identification. A cast cover is a device intended for medical...

2013-04-01

145

Prototype casting fabrication by stereolithography  

SciTech Connect

A new product development technology is emerging which could have a major impact on the investment casting industry. It's identified by several names, the most common of which is STEREOLITHOGRAPHY.'' This technology involves a three-dimensional printing process which will yield plastic parts (polymer models) from solid, surface, or wireframe CAD files. The concept links a CAD database to a process which guides a laser beam to solidify liquid photo-curable polymer into a programmed shaped. The process can produce models in far less time and at far less cost than can be done by other known (conventional) model producing methods. Parts that would normally require weeks or months to prototype with conventional processes can be produced in a matter of hours by Stereolithography. The Allied-Signal Inc., Kansas City Division, is engaged in a development project (funded by the Department of Energy) which is aimed at establishing this process as a practical, expedient, and cost-effective method fabricating prototype investment castings. The early phases of the project include procurement of a special designed test unit for several companies (Service Centers) involved in fabrication of models. These models are produced in various materials and used in experimental casting programs being conducted with four casting suppliers (two ferrous and two non-ferrous). This presentation will cover the objectives of the project and the results obtained up to this time. We will also briefly review future plans for the continuation of the project, until this new technology has been proven as a viable process for rapid development of investment castings.

Cromwell, W.E.

1990-11-01

146

CTD024Hickey, W8101, casts 24-26 Hickey, W8101, casts 24-26, page 1  

E-print Network

CTD024Hickey, W8101, casts 24-26 Hickey, W8101, casts 24-26, page 1 #12;ATTEN ATTEN CTD024 Hickey, W8101, casts 24-26 Hickey, W8101, casts 24-26, page 2 #12;ATTENATTEN CTD024 Hickey, W8101, casts 24-26 Hickey, W8101, casts 24-26, page 3 #12;ATTEN ATTEN CTD024 Hickey, W8101, casts 24-26 Hickey, W8101, casts

Hickey, Barbara

147

CTD051Hickey, TT162, casts 51-53 Hickey, TT162, casts 51-53, page 1  

E-print Network

CTD051Hickey, TT162, casts 51-53 Hickey, TT162, casts 51-53, page 1 #12;CTD051Hickey, TT162, casts 51-53 Hickey, TT162, casts 51-53, page 2 #12;CTD051Hickey, TT162, casts 51-53 Hickey, TT162, casts 51-53, page 3 #12;CTD051Hickey, TT162, casts 51-53 Hickey, TT162, casts 51-53, page 4 #12;CTD051Hickey, TT162

Hickey, Barbara

148

CTD031Hickey, TT162, Casts 31-36 Hickey, TT162, Casts 31-36, page 1  

E-print Network

CTD031Hickey, TT162, Casts 31-36 Hickey, TT162, Casts 31-36, page 1 #12;CTD031 Hickey, TT162, Casts 31-36 Hickey, TT162, Casts 31-36, page 2 #12;CTD031 Hickey, TT162, Casts 31-36 Hickey, TT162, Casts 31-36, page 3 #12;CTD031 Hickey, TT162, Casts 31-36 Hickey, TT162, Casts 31-36, page 4 #12;CTD031

Hickey, Barbara

149

CTD054Hickey, TT162, Casts 54-55 Hickey, TT162, Casts 54-55, page 1  

E-print Network

CTD054Hickey, TT162, Casts 54-55 Hickey, TT162, Casts 54-55, page 1 #12;CTD054Hickey, TT162, Casts 54-55 Hickey, TT162, Casts 54-55, page 2 #12;CTD054Hickey, TT162, Casts 54-55 Hickey, TT162, Casts 54-55, page 3 #12;CTD054Hickey, TT162, Casts 54-55 Hickey, TT162, Casts 54-55, page 4 #12;CTD054Hickey, TT162

Hickey, Barbara

150

Hickey, W8009C, casts 992-995 Hickey, W8009C, casts 992-995, page 1  

E-print Network

Hickey, W8009C, casts 992-995 Hickey, W8009C, casts 992-995, page 1 #12;Hickey, W8009C, casts 992-995 Hickey, W8009C, casts 992-995, page 2 #12;Hickey, W8009C, casts 992-995 Hickey, W8009C, casts 992-995, page 3 #12;Hickey, W8009C, casts 992-995 Hickey, W8009C, casts 992-995, page 4 #12;Hickey, W8009C

Hickey, Barbara

151

CTD025Hickey, TT162, Casts 25-30 Hickey, TT162, Casts 25-30, page 1  

E-print Network

CTD025Hickey, TT162, Casts 25-30 Hickey, TT162, Casts 25-30, page 1 #12;CTD025Hickey, TT162, Casts 25-30 Hickey, TT162, Casts 25-30, page 2 #12;CTD025Hickey, TT162, Casts 25-30 Hickey, TT162, Casts 25-30, page 3 #12;CTD025Hickey, TT162, Casts 25-30 Hickey, TT162, Casts 25-30, page 4 #12;CTD025Hickey, TT162

Hickey, Barbara

152

CTD033Hickey, W8201, casts 33-37 Hickey, W8201, casts 33-37, page 1  

E-print Network

CTD033Hickey, W8201, casts 33-37 Hickey, W8201, casts 33-37, page 1 #12;CTD033Hickey, W8201, casts 33-37 Hickey, W8201, casts 33-37, page 2 #12;CTD033Hickey, W8201, casts 33-37 Hickey, W8201, casts 33-37, page 3 #12;CTD033Hickey, W8201, casts 33-37 Hickey, W8201, casts 33-37, page 4 #12;CTD033Hickey, W8201

Hickey, Barbara

153

Mechanical evaluation of a soft cast material.  

PubMed

In this study, the structural and material properties of a new semi-rigid material, Scotchcast SoftCast (SCS), were compared to the properties of two rigid materials, plaster of paris (POP) and Scotchcast Plus (SCP). Cylinders and flat beams made from 4, 6, 8, and 10 layers of each casting material were tested in three-point bending and diametrical compression. Initial stiffness and yield force values of SCS casts were significantly lower than for casts of SCP and POP made of the same number of layers. Casts made from SCS may be indicated for non-rigid applications, but not where rigid immobilization is required. PMID:9263288

Zmurko, M G; Belkoff, S M; Herzenberg, J E

1997-08-01

154

Land-based turbine casting initiative  

SciTech Connect

To meet goals for the ATS program, technical advances developed for aircraft gas turbine engines need to be applied to land-based gas turbines. These advances include directionally solidified and single crystal castings, alloys tailored to exploit these microstructures, complex internal cooling schemes, and coatings. The proposed program to scale aircraft gas turbine casting technology up to land based gas turbine size components is based on low sulfur alloys, casting process development, post-cast process development, and establishing casting defect tolerance levels. The inspection side is also discussed.

Mueller, B.A.; Spicer, R.A. [Howmet Corp., Whitehall, MI (United States)

1995-12-31

155

Viscosity of casting fluxes used during continuous casting of steel  

NASA Astrophysics Data System (ADS)

Molten flux viscosity of eighteen commercially available casting fluxes has been measured as a function of temperature in the range of 1223 to 1723 K. Results show that, at a constant temperature, the flux viscosity is primarily dependent on the mole fractions of SiO2 and A12O3. The calculated activation energy for viscous flow at 1573 K varies from 59 to 215 kJ/mol depending on the flux viscosity and the flux basicity ratio. The observed “breakpoints” in the viscosity vs temperature plots are explained in terms of precipitation of crystalline phases. The tendency for crystal precipitation is related to the relative viscosity and the basicity of the flux. Using X-ray diffraction techniques the precipitating crystal phases have been identified. Metallographic structures of quenched and air-solidified casting fluxes are reported.

Lanyi, Michael D.; Rosa, Casimir J.

1981-06-01

156

Prediction of Part Distortion in Die Casting  

SciTech Connect

The die casting process is one of the net shape manufacturing techniques and is widely used to produce high production castings with tight tolerances for many industries. An understanding of the stress distribution and the deformation pattern of parts produced by die casting will result in less deviation from the part design specification, a better die design and eventually more productivity and cost savings. This report presents methods that can be used to simulate the die casting process in order to predict the deformation and stresses in the produced part and assesses the degree to which distortion modeling is practical for die casting at the current time. A coupled thermal-mechanical finite elements model was used to simulate the die casting process. The simulation models the effect of thermal and mechanical interaction between the casting and the die. It also includes the temperature dependant material properties of the casting. Based on a designed experiment, a sensitivity analysis was conducted on the model to investigate the effect of key factors. These factors include the casting material model, material properties and thermal interaction between casting and dies. To verify the casting distortion predictions, it was compared against the measured dimensions of produced parts. The comparison included dimensions along and across the parting plane and the flatness of one surface.

R. Allen Miller

2005-03-30

157

Pressure rig for repetitive casting  

NASA Technical Reports Server (NTRS)

The invention is a pressure rig for repetitive casting of metal. The pressure rig performs like a piston for feeding molten metal into a mold. Pressure is applied to an expandable rubber diaphragm which expands like a balloon to force the metal into the mold. A ceramic cavity which holds molten metal is lined with blanket-type insulating material, necessitating only a relining for subsequent use and eliminating the lengthy cavity preparation inherent in previous rigs. In addition, the expandable rubber diaphragm is protected by the insulating material thereby decreasing its vulnerability to heat damage. As a result of the improved design the life expectancy of the pressure rig contemplated by the present invention is more than doubled. Moreover, the improved heat protection has allowed the casting of brass and other alloys with higher melting temperatures than possible in the conventional pressure rigs.

Vasquez, Peter (inventor); Hutto, William R. (inventor); Philips, Albert R. (inventor)

1989-01-01

158

Hickey, W8009C, casts 1-9 Hickey, W8009C, casts 1-9, page 1  

E-print Network

Hickey, W8009C, casts 1-9 Hickey, W8009C, casts 1-9, page 1 #12;Hickey, W8009C, casts 1-9 Hickey, W8009C, casts 1-9, page 2 #12;Hickey, W8009C, casts 1-9 Hickey, W8009C, casts 1-9, page 3 #12;Hickey, W8009C, casts 1-9 Hickey, W8009C, casts 1-9, page 4 #12;Hickey, W8009C, casts 1-9 Hickey, W8009C, casts

Hickey, Barbara

159

APPLICATION OF COMPUTATIONAL FLUID DYNAMICS TO STEEL REFINING AND CASTING PROCESSES  

E-print Network

1 APPLICATION OF COMPUTATIONAL FLUID DYNAMICS TO STEEL REFINING AND CASTING PROCESSES Lifeng Zhang ladles, the continuous casting tundish, continuous casting mold and strand, and steel ingot casting, Continuous Casting, Ingot Casting, Inclusions INTRODUCTION Fluid flow during steelmaking, steel refining

Thomas, Brian G.

160

ATTEN ATTEN Hickey, W8101, casts 11-18,20  

E-print Network

ATTEN ATTEN Hickey, W8101, casts 11-18,20 Hickey, W8101, casts 11-18,20, page 1 #12;ATTENATTEN Hickey, W8101, casts 11-18,20 Hickey, W8101, casts 11-18,20, page 2 #12;ATTEN ATTEN Hickey, W8101, casts 11-18,20 Hickey, W8101, casts 11-18,20, page 3 #12;ATTEN ATTEN Hickey, W8101, casts 11-18,20 Hickey

Hickey, Barbara

161

Gating of Permanent Molds for ALuminum Casting  

SciTech Connect

This report summarizes a two-year project, DE-FC07-01ID13983 that concerns the gating of aluminum castings in permanent molds. The main goal of the project is to improve the quality of aluminum castings produced in permanent molds. The approach taken was determine how the vertical type gating systems used for permanent mold castings can be designed to fill the mold cavity with a minimum of damage to the quality of the resulting casting. It is evident that somewhat different systems are preferred for different shapes and sizes of aluminum castings. The main problems caused by improper gating are entrained aluminum oxide films and entrapped gas. The project highlights the characteristic features of gating systems used in permanent mold aluminum foundries and recommends gating procedures designed to avoid common defects. The study also provides direct evidence on the filling pattern and heat flow behavior in permanent mold castings.

David Schwam; John F. Wallace; Tom Engle; Qingming Chang

2004-03-30

162

Properties of electroslag castings. Part 2  

SciTech Connect

The quality, response to heat treatment, and mechanical properties of electroslag-cast step blocks from Cameron Iron Works and from Selectrotech, Inc., are described. The mechanical properties include Charpy impact, tensile, and creep. Properties of the electroslag castings were compared to determine the differences between casters, between wrought and electroslag cast properties, and between sand and electroslag castings. Results are presented to show that the electroslag casting process has a potential for producing properties similar to those of wrought material for 2 1/4 Cr-1 Mo and 9 Cr-1 Mo steel and similar to those of sand-cast material for type 316 stainless steel. 5 refs., 46 figs., 4 tabs.

Sikka, V.K.

1985-08-01

163

Gating of Permanent Molds for Aluminum Casting  

Microsoft Academic Search

This report summarizes a two-year project, DE-FC07-011D13983 that concerns the gating of aluminum castings in permanent molds. The main goal of the project is to improve the quality of aluminum castings produced in permanent molds. The approach taken was to determine how the vertical type gating systems used for permanent mold castings can be designed to fill the mold cavity

David Schwam; John F. Wallace; Tom Engle; Qingming Chang

2004-01-01

164

Reproductive Caste Beats a Hasty Retreat  

Microsoft Academic Search

Seven species of Australian gall-inducing thrips have a helping caste (soldiers). This caste is morphologically distinct and\\u000a has been shown to use these physical differences to be a more effective fighting force. Here we investigate behavioral differences\\u000a between castes of Kladothrips intermedius (Bagnall) when faced with the destruction of the gall; that is, walking behavior rather than fighting. Two parameters,

Sheena E. Fry; Holly E. Caravan; Thomas W. Chapman

165

Cast stainless steel aging: Mechanisms and predictions  

Microsoft Academic Search

Charpy-impact and J-R curve data are presented for several experimental and commercial heats, as well as for reactor-aged material of CF-3, CF-8, and CF-8M grades of cast stainless steel. The effects of material variables on the embrittlement of cast stainless steels are evaluated. In general, the low carbon CF-3 grades of cast stainless steels are the most resistance and molybdenum-containing

O. K. Chopra; H. M. Chung

1989-01-01

166

Dental casting of titanium and Ni-Ti alloys by a new casting machine.  

PubMed

The purpose of this study was to develop a new casting machine for titanium and Ni-Ti alloys. Properties of cast pure titanium and Ni-Ti alloys were studied by means of the tensile and casting tests. As gas in the mold was removed by the mold being heated under a high vacuum, the reaction between the molten metal and the mold decreased. The new control system and the two types of crucibles developed proved very useful for prevention of internal macro-defects in castings and for improvement of castability. Mechanical properties and castability of pure titanium were improved. Ni-Ti alloys could be cast without loss of their shape-memory effect or super-elasticity characteristics. The new casting machine is thought to be promising for the casting of titanium and Ni-Ti alloys. Furthermore, we can cast these alloys using conventional techniques and investments. PMID:2685069

Hamanaka, H; Doi, H; Yoneyama, T; Okuno, O

1989-11-01

167

WinMod: An expert advisor for investment casting  

Microsoft Academic Search

Investment casting is an important method for fabricating a variety of high quality components in mechanical systems. Cast components, unfortunately, have a large design and gate\\/runner build time associated with their fabrication. In addition, casting engineers often require many years of actual experience in order to consistently pour high quality castings. Since 1989, Sandia National Laboratories has been investigating casting

H. P. Bivens; G. A. Jr. Williamson; G. F. Luger; R. G. Erdmann; M. C. Maguire; M. D. Baldwin; D. J. Anderson

1998-01-01

168

Feeding and Risering of High Alloy Steel Castings  

E-print Network

Feeding and Risering of High Alloy Steel Castings Kent D. Carlson, Shouzhu Ou and Christoph radiographically sound castings at 2 pct sensitivity. By comparing results between plate casting trials in an extensive set of casting simulations to numerically determine feeding distances for a wide range of casting

Beckermann, Christoph

169

Casting an Object with a Core Hee-Kap Ahn  

E-print Network

Casting an Object with a Core Hee-Kap Ahn Sang Won Bae Siu-Wing Cheng Kyung-Yong Chwa Abstract This paper addresses geometric problems that concern manufacturing an object using a cast with a core. In casting, molten material is poured into the cavity of the cast and allowed to solidify. The cast has two

Cheng, Siu-Wing

170

ASEM Analysis of Casting Defects  

NASA Astrophysics Data System (ADS)

While casting defects are a fact of life in the foundry, a method has been developed for analyzing these defects by employing analytical scanning electron microscopy (ASEM). The use of a backscattered electron detector and energy dispersive x-ray systems, available on most ASEM's, facilitates the examination of various defects. Computer storage and programming can make analysis of many particulate defects a routine procedure. Overall, the method provides a starting point from which a person with a knowledge of the process can begin to quickly diagnose the cause of defects. Examples of the usefulness of the technique are presented using case histories from a grey iron foundry.

Votava, Ward E.

1987-09-01

171

Study on theoretical bases of receiving composite alloy layers on surface of cast steel castings  

Microsoft Academic Search

The use of composite alloy layers on chosen surfaces of cast makes possible to obtain a special usable properties. Composite alloy layers on cast steel shapes with liquid phase. The processes which set in form during formation of composite layer, progress beside the transient heat flow that the transient thermal field. Decrease of temperature in surface layer of cast causes

J. Gawro?ski; J. Szajnar; P. Wróbel

2004-01-01

172

Dental Casting of Titanium and Ni-Ti Alloys by a New Casting Machine  

Microsoft Academic Search

The purpose of this study was to develop a new casting machine for titanium and Ni-Ti alloys. Properties of cast pure titanium and Ni-Ti alloys were studied by means of the tensile and casting tests. As gas in the mold was removed by the mold being heated under a high vacuum, the reaction between the molten metal and the mold

H. Hamanaka; H. Doi; T. Yoneyama; O. Okuno

1989-01-01

173

Hickey, W8010A casts 1-6 Hickey, W8010A casts 1-6, page 1  

E-print Network

Hickey, W8010A casts 1-6 Hickey, W8010A casts 1-6, page 1 CTD001 #12;Hickey, W8010A casts 1-6 Hickey, W8010A casts 1-6, page 2 CTD001 #12;Hickey, W8010A casts 1-6 Hickey, W8010A casts 1-6, page 3 CTD001 #12;Hickey, W8010A casts 1-6 Hickey, W8010A casts 1-6, page 4 CTD001 #12;Hickey, W8010A casts 1

Hickey, Barbara

174

AN INTRODUCTION TO R-CAST Developing Simple Agents Using Decision-making Modeling and the R-CAST Architecture  

E-print Network

AN INTRODUCTION TO R-CAST Developing Simple Agents Using Decision-making Modeling and the R-CAST and Technology The Pennsylvania State University #12;ALL RIGHTS RESERVED © 2006. This R-CAST tutorial, the R-CAST. Prindible For more information. Visit: http://agentlab.psu.edu/ 2 #12;R-CAST 2.5 SYSTEM REQUIREMENTS Minimum

175

Yield Improvement in Steel Casting (Yield II)  

SciTech Connect

This report presents work conducted on the following main projects tasks undertaken in the Yield Improvement in Steel Casting research program: Improvement of Conventional Feeding and Risering Methods, Use of Unconventional Yield Improvement Techniques, and Case Studies in Yield Improvement. Casting trials were conducted and then simulated using the precise casting conditions as recorded by the participating SFSA foundries. These results present a statistically meaningful set of experimental data on soundness versus feeding length. Comparisons between these casting trials and casting trials performed more than forty years ago by Pellini and the SFSA are quite good and appear reasonable. Comparisons between the current SFSA feeding rules and feeding rules based on the minimum Niyama criterion reveal that the Niyama-based rules are generally less conservative. The niyama-based rules also agree better with both the trials presented here, and the casting trails performed by Pellini an d the SFSA years ago. Furthermore, the use of the Niyama criterion to predict centerline shrinkage for horizontally fed plate sections has a theoretical basis according to the casting literature reviewed here. These results strongly support the use of improved feeding rules for horizontal plate sections based on the Niyama criterion, which can be tailored to the casting conditions for a given alloy and to a desired level of soundness. The reliability and repeatability of ASTM shrinkage x-ray ratings was investigated in a statistical study performed on 128 x-rays, each of which were rated seven different times. A manual ''Feeding and Risering Guidelines for Steel Castings' is given in this final report. Results of casting trials performed to test unconventional techniques for improving casting yield are presented. These use a stacked arrangement of castings and riser pressurization to increase the casting yield. Riser pressurization was demonstrated to feed a casting up to four time s the distance of a non-pressurized riser, and can increase casting yield by decreasing the required number of risers. All case studies for this projects were completed and compiled into an SFSA Technical Report that is submitted part of this Final Report

Richard A. Hardin; Christoph Beckermann; Tim Hays

2002-02-18

176

21 CFR 888.5960 - Cast removal instrument.  

... 2014-04-01 2014-04-01 false Cast removal instrument. 888.5960 Section...DEVICES Surgical Devices § 888.5960 Cast removal instrument. (a) Identification. A cast removal instrument is an AC-powered,...

2014-04-01

177

21 CFR 888.5960 - Cast removal instrument.  

Code of Federal Regulations, 2011 CFR

... 2011-04-01 2011-04-01 false Cast removal instrument. 888.5960 Section...DEVICES Surgical Devices § 888.5960 Cast removal instrument. (a) Identification. A cast removal instrument is an AC-powered,...

2011-04-01

178

21 CFR 888.5960 - Cast removal instrument.  

Code of Federal Regulations, 2013 CFR

... 2013-04-01 2013-04-01 false Cast removal instrument. 888.5960 Section...DEVICES Surgical Devices § 888.5960 Cast removal instrument. (a) Identification. A cast removal instrument is an AC-powered,...

2013-04-01

179

21 CFR 888.5960 - Cast removal instrument.  

Code of Federal Regulations, 2012 CFR

... 2012-04-01 2012-04-01 false Cast removal instrument. 888.5960 Section...DEVICES Surgical Devices § 888.5960 Cast removal instrument. (a) Identification. A cast removal instrument is an AC-powered,...

2012-04-01

180

21 CFR 888.5960 - Cast removal instrument.  

Code of Federal Regulations, 2010 CFR

... 2010-04-01 2010-04-01 false Cast removal instrument. 888.5960 Section...DEVICES Surgical Devices § 888.5960 Cast removal instrument. (a) Identification. A cast removal instrument is an AC-powered,...

2010-04-01

181

Thermo fatigue cracking of die casting dies  

Microsoft Academic Search

The investigation of aluminium alloy die casting die failures was done with the emphasis on thermal cracks. The aim of the study was to prolog the in-service die life by cladding with maraging steels, which would be economically beneficial. A vast analysis of thermal fatigue cracks in aluminium alloy die casting is done. Immersion test apparatus was developed, which enables

D. Klob?ar; L. Kosec; B. Kosec; J. Tušek

2010-01-01

182

A Note on Caste Subhash Kak  

E-print Network

. In an example of reality being fashioned in the image of a simulacrum, many Indians have started believing the conversion of the other castes to Islam? Does this represent a variant of Hindu religion where the caste converted to Islam in Kashmir is wrong. The Kashmiri Hindus preserve appellations, such as r

Koppelman, David M.

183

Iron/Phosphorus Alloys for Continuous Casting  

NASA Technical Reports Server (NTRS)

Continuous casting becomes practicable because of reduced eutectic temperature. Experimental ferrous alloy has melting point about 350 degrees C lower than conventional steels, making possible to cast structural members and eliminating need for hot rolling. Product has normal metal structure and good physical properties. Process used to make rails, beams, slabs, channels, and pipes.

Dufresne, E. R.

1986-01-01

184

Multiphysics Modelling of the Metals Casting Process  

Microsoft Academic Search

Metals casting is a process governed by the interaction of a range of physical phenomena. Most computational models of this process address only what are conventionally regarded as the primary phenomena-heat conduction and solidification. However, to predict the formation of porosity (a factor of key importance in cast quality) requires the modelling of the interaction of the fluid flow, heat

C. Bailey; P. Chow; M. Cross; Y. Fryer; K. Pericleous

1996-01-01

185

Aqueous tape casting of silicon nitride  

Microsoft Academic Search

Slurries consisting of a low cost silicon nitride powder, sintering aids yttria and alumina, dispersants, binders, defoamers and water as a solvent were optimised for tape casting by electroacoustic and viscosity measurements and by casting experiments. The slurries exhibit shear-thinning behaviour due to the highly shear-thinning binder emulsion. Crack free tapes with a maximum thickness of approx. 250 ?m and

Bernd Bitterlich; Jürgen G Heinrich

2002-01-01

186

Zinc Casting and Recycling (8 pp)  

Microsoft Academic Search

Aim, Scope and Background. Metal die casting is a highly energy-intensive industry. In addition to that, the production of primary zinc by smelting consumes huge amounts of energy as well as generates many types of pollution. This paper uses LCA to investigate the environmental performance of a zinc cast product. The areas of environmental concern are focused on the direct

Reginald Tan; Hsien H. Khoo

2005-01-01

187

Dimensional variability of production steel castings  

SciTech Connect

Work is ongoing to characterize the dimensional variability of steel casting features. Data are being collected from castings produced at representative Steel Founders` Society of America foundries. Initial results based on more than 12,500 production casting feature measurements are presented for carbon and low alloy steel castings produced in green sand, no-bake, and shell molds. A comprehensive database of casting, pattern, and feature variables has been developed so that the influence of the variables on dimensional variability can be determined. Measurement system analysis is conducted to insure that large measurement error is not reported as dimensional variability. Results indicate that the dimensional variability of production casting features is less than indicated in current US (SFSA) and international (ISO) standards. Feature length, casting weight, parting line and molding process all strongly influence dimensional variability. Corresponding pattern measurements indicate that the actual shrinkage amount for casting features varies considerably. This variation in shrinkage will strongly influence the ability of the foundry to satisfy customer dimensional requirements.

Peters, F.E.; Risteu, J.W.; Vaupel, W.G.; DeMeter, E.C.; Voigt, R.C.

1994-12-31

188

Seal welded cast iron nuclear waste container  

Microsoft Academic Search

This invention identifies methods and articles designed to circumvent metallurgical problems associated with hermetically closing an all cast iron nuclear waste package by welding. It involves welding nickel-carbon alloy inserts which are bonded to the mating plug and main body components of the package. The welding inserts might be bonded in place during casting of the package components. When the

Arthur M. Filippi; Richard P. Sprecace

1987-01-01

189

Modeling of nickel and iron aluminide castings  

SciTech Connect

This paper addresses some issues in producing Ni and Fe aluminide castings and illustrates use of computer simulation of the casting process to solve these problems. Available casting software and issues in their use are reviewed. Importance of availability of accurate thermophysical properties is illustrated by comparing sensitivity of computed cooling curves to changes in these properties. If constant thermophysical properties must be used in solidification simulation, the values at the solidus temperature are likely to provide greatest accuracy; significant errors may be incurred by use of constant room temperature properties. Examples are given of the mold filling analysis of sand cast heat treating trays and centrifugally cast transfer rolls of Ni aluminide alloy. In the case of sand cast heat treating trays, the simulation of mold filling is used to illustrate benefits of pouring the mold at a tilt to reduce turbulence in the runner. In the case of centrifugally cast rolls, the simulation is used to illustrate effect of inlet velocity during the pour on casting quality.

Viswanathan, S.; Duncan, A.J.; Porter, W.D.; Webb, D.S.

1996-12-31

190

The CAST (Childhood Asperger Syndrome Test)  

ERIC Educational Resources Information Center

The Childhood Asperger Syndrome Test (CAST) is a parental questionnaire to screen for autism spectrum conditions. In this validation study, the CAST was distributed to 1925 children aged 5-11 in mainstream Cambridgeshire schools. A sample of participants received a full diagnostic assessment, conducted blind to screen status. The sensitivity of…

Williams, Jo; Scott, Fiona; Stott, Carol; Allison, Carrie; Bolton, Patrick; Baron-Cohen, Simon; Brayne, Carol

2005-01-01

191

Casting of electron field defining apertures: Casting with the metal mold kits  

SciTech Connect

Cerrobend alloy casts are made to define the desired electron field shapes. These custom casts are fabricated for the selected electron applicator size that has been chosen for the patient. When the cast is placed into that selected electron applicator, it will block out areas that are not to be treated. When an all metal mold assembly was used for the fabrication of these casts, the lip region of the cast which is used to accurately align the cast in the actual treatment applicator, had an irregular edge that prevented an accurate alignment of the cast. To eliminate the irregular edges on the lip region of the cast, the metal mold assembly was heated to approximately 80-85 degrees C before the molten cerrobend alloy was poured into it. The heating of the metal mold assembly helps eliminate the irregular edges on the lip region of the cast. Unfortunately it also created new flaws such as holes, dents, cracks and/or crystallization of the cast as it solidified. These flaws were controlled by cooling the metal mold assembly and the cast immediately after the pouring of the molten cerrobend alloy, evenly with water.

Dea, D.; San Luis, E. (Univ. of California, San Francisco (USA))

1988-09-01

192

Final report on Expendable Pattern Casting Technology  

SciTech Connect

The Expendable Pattern Casting (EPC) process is a potential casting process breakthrough which could dramatically improve the competitiveness of the US foundry industry. Cooperatively supported by US Industry and the Department of Energy and managed by the American Foundrymen's Society, a project was started in May 1989 to develop and optimize expendable pattern casting technology. Four major tasks were conducted in the first phase of the project. Those tasks involved: (1) reviewing published literature to determine the major problems in the EPC process, (2) evaluating factors influencing sand flow and compaction, (3) evaluating and comparing factors influencing sand flow and compaction, (3) evaluating and comparing casting precision obtained in the EPC process with that obtained in other processes, and (4) identifying critical parameters that control dimensional precision and defect formation in EP castings. 26 refs., 27 figs., 11 tabs.

Not Available

1990-07-01

193

The production of large structural titanium castings  

NASA Astrophysics Data System (ADS)

Titanium-alloy castings have recently become an attractive option for critical-structural applications in aerospace structures. These opportunities have occurred primarily because of the development of advanced-process technologies, such as rapid-prototyping methodology and solidification modeling, which have dramatically reduced the cost and time required to obtain first-article castings through concurrent engineering. Moreover, these technologies have lowered the risk involved in examining new applications for titanium castings. This article examines the implementation of these new technologies and the heat treatment and mechanical properties of large structural castings, particularly in relation to section size. Additionally, the production of a cast-titanium transmission adapter for the V-22 Osprey Tiltrotoraircraft is described.

Klepeisz, J.; Veeck, S.

1997-11-01

194

Hickey -TT174, casts 21, line 18 to cast 31, line 24 Cruise cast lat(dd.mm.mm) lon(dd.mm.mm) Date/Time (MMDDYYHHMM) Total Scans  

E-print Network

Hickey -TT174, casts 21, line 18 to cast 31, line 24 Cruise cast lat(dd.mm.mm) lon(dd.mm.mm) Date;Hickey -TT174, casts 21, line 18 to cast 31, line 24 Cruise cast lat(dd.mm.mm) lon(dd.mm.mm) Date;Hickey -TT174, casts 21, line 18 to cast 31, line 24 Cruise cast lat(dd.mm.mm) lon(dd.mm.mm) Date

Hickey, Barbara

195

Porosity inside a metal casting  

NASA Technical Reports Server (NTRS)

Pores and voids often form in metal castings on Earth (above) making them useless. A transparent material that behaves at a large scale in microgravity the way that metals behave at the microscopic scale on Earth, will help show how voids form and learn how to prevent them. Scientists are using the microgravity environment on the International Space Station to study how these bubbles form, move and interact. The Pore Formation and Mobility Investigation (PFMI) in the Microgravity Science Glovebox aboard the International Space Station uses a transparent material called succinonitrile that behaves like a metal to study this problem. Video images sent to the ground allow scientists to watch the behavior of the bubbles as they control the melting and freezing of the material. The bubbles do not float to the top of the material in microgravity, so they can study their interactions.

2003-01-01

196

Hickey, W8010A casts 32-34 Hickey, W8010A casts 32-34, page 1  

E-print Network

Hickey, W8010A casts 32-34 Hickey, W8010A casts 32-34, page 1 CTD032 #12;Hickey, W8010A casts 32-34 Hickey, W8010A casts 32-34, page 2 CTD032 #12;Hickey, W8010A casts 32-34 Hickey, W8010A casts 32-34, page 3 CTD032 #12;Hickey, W8010A casts 32-34 Hickey, W8010A casts 32-34, page 4 CTD032 #12;Hickey, W8010A

Hickey, Barbara

197

Hickey, W8010A, Casts 7-10 Hickey, W8010A, Casts 7-10, page 1  

E-print Network

Hickey, W8010A, Casts 7-10 Hickey, W8010A, Casts 7-10, page 1 CTD007 #12;Hickey, W8010A, Casts 7-10 Hickey, W8010A, Casts 7-10, page 2 CTD007 #12;Hickey, W8010A, Casts 7-10 Hickey, W8010A, Casts 7-10, page 3 CTD007 #12;Hickey, W8010A, Casts 7-10 Hickey, W8010A, Casts 7-10, page 4 CTD007 #12;Hickey, W8010A

Hickey, Barbara

198

Hickey, W8206_ctd_casts 67-128 Hickey, W8206_ctd_casts 67-128, page 1  

E-print Network

Hickey, W8206_ctd_casts 67-128 Hickey, W8206_ctd_casts 67-128, page 1 #12;Hickey, W8206_ctd_casts 67-128 Hickey, W8206_ctd_casts 67-128, page 2 #12;Hickey, W8206_ctd_casts 67-128 Hickey, W8206_ctd_casts 67-128, page 3 #12;Hickey, W8206_ctd_casts 67-128 Hickey, W8206_ctd_casts 67-128, page 4 #12;Hickey

Hickey, Barbara

199

Hickey, W8010A casts 21-27 Hickey, W8010A casts 21-27, page 1  

E-print Network

Hickey, W8010A casts 21-27 Hickey, W8010A casts 21-27, page 1 CTD021 #12;Hickey, W8010A casts 21-27 Hickey, W8010A casts 21-27, page 2 CTD021 #12;Hickey, W8010A casts 21-27 Hickey, W8010A casts 21-27, page 3 CTD021 #12;Hickey, W8010A casts 21-27 Hickey, W8010A casts 21-27, page 4 CTD022 #12;Hickey, W8010A

Hickey, Barbara

200

Hickey, W8010A casts 11-20 Hickey, W8010A casts 11-20, page 1  

E-print Network

Hickey, W8010A casts 11-20 Hickey, W8010A casts 11-20, page 1 CTD011 #12;Hickey, W8010A casts 11-20 Hickey, W8010A casts 11-20, page 2 CTD011 #12;Hickey, W8010A casts 11-20 Hickey, W8010A casts 11-20, page 3 CTD011 #12;Hickey, W8010A casts 11-20 Hickey, W8010A casts 11-20, page 4 CTD011 #12;Hickey, W8010A

Hickey, Barbara

201

Hickey, W8010A casts 35-40 Hickey, W8010A casts 35-40, page 1  

E-print Network

Hickey, W8010A casts 35-40 Hickey, W8010A casts 35-40, page 1 CTD035 #12;Hickey, W8010A casts 35-40 Hickey, W8010A casts 35-40, page 2 CTD035 #12;Hickey, W8010A casts 35-40 Hickey, W8010A casts 35-40, page 3 CTD035 #12;Hickey, W8010A casts 35-40 Hickey, W8010A casts 35-40, page 4 CTD035 #12;Hickey, W8010A

Hickey, Barbara

202

CTD027Hickey, W8009C, casts 27-33 Hickey, W8009C, casts 27-33, page 1  

E-print Network

CTD027Hickey, W8009C, casts 27-33 Hickey, W8009C, casts 27-33, page 1 #12;CTD027Hickey, W8009C, casts 27-33 Hickey, W8009C, casts 27-33, page 2 #12;CTD027Hickey, W8009C, casts 27-33 Hickey, W8009C, casts 27-33, page 3 #12;CTD027Hickey, W8009C, casts 27-33 Hickey, W8009C, casts 27-33, page 4 #12;CTD027

Hickey, Barbara

203

Hickey, W8010A casts 41-51 Hickey, W8010A casts 41-51, page 1  

E-print Network

Hickey, W8010A casts 41-51 Hickey, W8010A casts 41-51, page 1 CTD041 #12;Hickey, W8010A casts 41-51 Hickey, W8010A casts 41-51, page 2 CTD041 #12;Hickey, W8010A casts 41-51 Hickey, W8010A casts 41-51, page 3 CTD042 #12;Hickey, W8010A casts 41-51 Hickey, W8010A casts 41-51, page 4 CTD042 #12;Hickey, W8010A

Hickey, Barbara

204

Hickey, W8010A casts 28-31 Hickey, W8010A casts 28-31, page 1  

E-print Network

Hickey, W8010A casts 28-31 Hickey, W8010A casts 28-31, page 1 CTD028 #12;Hickey, W8010A casts 28-31 Hickey, W8010A casts 28-31, page 2 CTD028 #12;Hickey, W8010A casts 28-31 Hickey, W8010A casts 28-31, page 3 CTD028 #12;Hickey, W8010A casts 28-31 Hickey, W8010A casts 28-31, page 4 CTD028 #12;Hickey, W8010A

Hickey, Barbara

205

CTD015Hickey, W8009C, casts 15-26 Hickey, W8009C, casts 15-26, page 1  

E-print Network

CTD015Hickey, W8009C, casts 15-26 Hickey, W8009C, casts 15-26, page 1 #12;CTD015Hickey, W8009C, casts 15-26 Hickey, W8009C, casts 15-26, page 2 #12;CTD016Hickey, W8009C, casts 15-26 Hickey, W8009C, casts 15-26, page 3 #12;CTD016Hickey, W8009C, casts 15-26 Hickey, W8009C, casts 15-26, page 4 #12;CTD017

Hickey, Barbara

206

Characterization of Technetium Speciation in Cast Stone  

SciTech Connect

This report describes the results from laboratory tests performed at Pacific Northwest National Laboratory (PNNL) for the U.S. Department of Energy (DOE) EM-31 Support Program (EMSP) subtask, “Production and Long-Term Performance of Low Temperature Waste Forms” to provide additional information on technetium (Tc) speciation characterization in the Cast Stone waste form. To support the use of Cast Stone as an alternative to vitrification for solidifying low-activity waste (LAW) and as the current baseline waste form for secondary waste streams at the Hanford Site, additional understanding of Tc speciation in Cast Stone is needed to predict the long-term Tc leachability from Cast Stone and to meet the regulatory disposal-facility performance requirements for the Integrated Disposal Facility (IDF). Characterizations of the Tc speciation within the Cast Stone after leaching under various conditions provide insights into how the Tc is retained and released. The data generated by the laboratory tests described in this report provide both empirical and more scientific information to increase our understanding of Tc speciation in Cast Stone and its release mechanism under relevant leaching processes for the purpose of filling data gaps and to support the long-term risk and performance assessments of Cast Stone in the IDF at the Hanford Site.

Um, Wooyong; Jung, Hun Bok; Wang, Guohui; Westsik, Joseph H.; Peterson, Reid A.

2013-11-11

207

NWIS MEASUREMENTS FOR URANIUM METAL ANNULAR CASTINGS  

SciTech Connect

This report describes measurements performed with annular uranium metal castings of different enrichments to investigate the use of {sup 252}Cf-source-driven noise analysis measurements as a means to quantify the amount of special nuclear material (SNM) in the casting. This work in FY 97 was sponsored by the Oak Ridge Y-12 Plant and the DOE Office of Technology Development Programs. Previous measurements and calculational studies have shown that many of the signatures obtained from the source-driven measurement are very sensitive to fissile mass. Measurements were performed to assess the applicability of this method to standard annular uranium metal castings at the Oak Ridge Y-12 plant under verification by the International Atomic Energy Agency (IAEA) using the Nuclear Weapons Identification System (NWIS) processor. Before the measurements with different enrichments, a limited study of source-detector-casting moderator configurations was performed to enhance the correlated information. These configurations consisted of a casting with no reflector and with various thicknesses of polyethylene reflectors up to 10.16 cm in 2.54 cm steps. The polyethylene moderator thickness of 7.62 cm was used for measurements with castings of different enrichments reported here. The sensitivity of the measured parameters to fissile mass was investigated using four castings each with a different enrichment. The high sensitivity of this measurement method to fissile mass and to other material and configurations provides some advantages over existing safeguards methods.

MATTINGLY, J.K.; VALENTINE, T.E.; MIHALCZO, J.T.

1998-03-13

208

Subcritical Measurements Multiple HEU Metal Castings  

SciTech Connect

Experiments with the standard annular highly enriched uranium (HEU) metal castings at Y-12 were performed in which up to 5 castings ({approx}90kg) were assembled in a tightly packed array with minimal spacing between castings. The fission chain multiplication process was initiated by a time tagged {sup 253}Cf spontaneously fissioning neutron source or time and directionally tagged neutrons from a small portable DT neutron generator and the prompt neutron time behavior measured with plastic scintillation detectors sensitive the fast neutron (>1 MeV) and gamma ray without distinction. These experiments were performed to provide data to benchmark methods for the calculation of the prompt neutron time behavior. Previous measurements with a single casting have been reported. This paper presents the experimental results for multiple castings. The prompt time decay was obtained by time coincidence correlation measurements between the detectors and the time tagged neutron source emission (equivalent to randomly pulsed neutron measurements) and between pairs of plastic scintillation detectors (equivalent to a 2-detector Rossi-alpha measurement). These standard HEU storage castings at the Y-12 plant had 5.000-in-OD, 3.500-in-ID, masses between 17,636 and 17,996 g, impurity content of 992 ppm, density of 18.75 g/cm{sup 3} and average enrichment of 93.16 wt % {sup 235}U. The castings were in tight fitting 025-in.-thick, 8.0-in-high stainless steel (SS-304) cylindrical cans for contamination control which were 8.0 in high. One can had an inside diameter of 3.0 in so that the Cf source could be located on the axes of this casting. Four 1 x 1 x 6 in plastic scintillators with the long dimension perpendicular to axes of the castings and adjacent to the outer surface of the casting cans were used. The detectors were enclosed in 1/4.-in.-thick lead shields on four 1 x 6 surfaces and on the 1 x 1 surface. The small surface of the lead shield was adjacent to the steel table. The photograph of the assembly of 5 casting with the detectors is given in Figure 1. The DT generator can be seen in the back with the time tagged neutrons aligned symmetrically around a line drawn from the generator through target spot and the center of the casting in the annular can seen in the foreground.

Mihalczo, John T [ORNL] [ORNL; Archer, Daniel E [ORNL] [ORNL; Wright, Michael C [ORNL] [ORNL

2008-01-01

209

The CAST experiment: status and perspectives  

E-print Network

The status of the solar axion search with the CERN Axion Solar Telescope (CAST) will be discussed. Results from the first part of CAST phase II where the magnet bores were filled with 4He gas at variable pressure in order to scan axion masses up to 0.4 eV will be presented. From the absence of excess X-rays when the magnet was pointing to the Sun, we set a typical upper limit on the axion-photon coupling of g CAST phase II. Expectations for sensibilities will be given. Near future perspectives as well as more long term options for a new helioscope experiment will be evoked.

F. J. Iguaz

2011-10-10

210

The effect of casting temperature on the fatigue properties of cast nickel aluminide alloys  

SciTech Connect

The results of high cycle fatigue tests at 650{degree}C on several cast Ni{sub 3}Al alloys are reported and compared to cast IN-713C. These alloys include IC-221M and several variations to the IC-221M composition. The effect of casting temperature is investigated using castings poured at three different temperatures spanning a 56{degree}C range. The results show that IC-221M cast at the highest temperature has the best fatigue strength, exceeding that for IN-713C. In these alloys, crack initiation occurs at shrinkage microporosity and the effect of casting temperature on porosity is related to the observed differences in fatigue lives. 11 refs., 4 figs.

Gieseke, B.; Sikka, V.K.

1991-01-01

211

INTEGRATED DESIGN OF STEEL CASTINGS FOR SERVICE PERFORMANCE  

E-print Network

INTEGRATED DESIGN OF STEEL CASTINGS FOR SERVICE PERFORMANCE Richard. A. Hardin1 , Richard K. Huff2, USA 2 Caterpillar Inc., Champaign, IL 61820, USA Keywords: steel casting, porosity, fatigue life made of steel castings that couples casting simulation with stress and fatigue simulation of the part

Beckermann, Christoph

212

Capabilities and Integration Potential of Current Casting Design Software  

E-print Network

are being investigated. The cast materials that are being considered include steel, cast iron, aluminumCapabilities and Integration Potential of Current Casting Design Software ( A Preliminary Report) D, G.W., and Srinivasan, V., "Capabilities and Integration Potential of Current Casting Design Software

Beckermann, Christoph

213

Macei Alagoas -Brazil Beam casting implicit surfaces on the GPU  

E-print Network

Maceió ­ Alagoas - Brazil Beam casting implicit surfaces on the GPU with interval arithmetic on the GPU with interval arithmetic 2 Barth: Related work Introduction #12;8/27/11 3Beam casting implicit surfaces on the GPU with interval arithmetic 3 Ray casting Introduction #12;8/27/11 4Beam casting implicit

214

Diabetic Neuropathy: What is a Total Contact Cast?  

MedlinePLUS

MENU Return to Web version Diabetic Neuropathy | What is a Total Contact Cast? What is a total contact cast? A total contact cast is a cast used to treat ulcers (serious, deep sores) on a person’s foot. It consists of a fiberglass shell that fits around your leg and foot very ...

215

2005 May JOM 35 Casting DefectsOverview  

E-print Network

, for commercial applications, die casting is used as a net-shape process. Die cast- ing, a common technique, on the other hand, are slow cool- ing and small temperature gradients. In a die-cast process, the liquid BMG2005 May · JOM 35 Casting DefectsOverview Superplastic forming (SPF) is intro- duced

Haller, Gary L.

216

Modeling and simulation of heat transfer phenomena during investment casting  

Microsoft Academic Search

Determining the heat transfer phenomena during casting processes is an important parameter for measuring the overall performance of process. It gives information about the properties of the metal being casted and its possible behavior in the mold during casting process. Improper determination of heat transfer phenomena and use of improper molding materials and casting conditions leads to defects such as

M.M.A. Rafique; J. Iqbal

2009-01-01

217

Casting with Skewed Ejection Direction Hee-Kap Ahn1  

E-print Network

Casting with Skewed Ejection Direction Hee-Kap Ahn1 Siu-Wing Cheng2 Otfried Cheong3 Abstract Casting is a manufacturing process in which liquid is poured into a cast (mould) that has a cavity with the shape of the object to be manufactured. The liquid then hardens, after which the cast is removed. We

Cheng, Siu-Wing

218

Clamshell Casting Prosenjit Bose, Pat Morin, Michiel Smid, Stefanie Wuhrer  

E-print Network

Clamshell Casting Prosenjit Bose, Pat Morin, Michiel Smid, Stefanie Wuhrer School of Computer}@scs.carleton.ca Abstract A popular manufacturing technique is clamshell casting, where liquid is poured into a cast and the cast is removed by a rotation once the liquid has hardened. We consider the case where the object

Smid, Michiel

219

COMPARISON OF FATIGUE BEHAVIOR FOR CENTRIFUGALLY CAST AND  

E-print Network

COMPARISON OF FATIGUE BEHAVIOR FOR CENTRIFUGALLY CAST AND KEEL BLOCK CAST STEEL J.J. Gradman1 , R The objective of this research was to determine if location through the wall thickness of centrifugal castings affects fatigue properties and to compare fatigue and monotonic tensile properties of centrifugal castings

Beckermann, Christoph

220

RELIABILITY-BASED CASTING PROCESS DESIGN OPTIMIZATION  

E-print Network

in a purely deterministic approach, replacing iterative trial-and- error process development on the shop floor system optimization. In optimization of the casting feeding system, optimal sizes and locations

Beckermann, Christoph

221

Advanced lost foam from casting technology  

SciTech Connect

Previous research made significant advances in understanding the Lost Foam Casting (LFC) Process and clearly identified areas where additional research was needed to improve the process and make it more functional in an industrial environment. The current project focused on five areas listed as follows: Task 1: Precision Pattern Production Task 2: Pattern Coating Consistency Task 3: Sand Fill and Compaction Effects Task 4: Pattern Gating Task 5: Mechanical Properties of Castings. This report summarizes the work done under the current contract in all five areas in the period of October 1, 1994 through December 31, 1995. Twenty-eight (28) companies jointly participate in the project. These companies represent a variety of disciplines, including pattern designers, pattern producers, coating manufacturers, plant design companies, compaction equipment manufacturers, casting producers, and casting buyers.

Bates, C.E.; Littleton, H.E.; Askeland, D., Griffin, J., Miller, B.A., Sheldon, D.S.

1996-05-01

222

Beryllium-aluminum alloys for investment castings  

SciTech Connect

Beryllium-aluminum alloys containing greater than 60 wt % beryllium are very favorable materials for applications requiring light weight and high stiffness. However, when produced by traditional powder metallurgical methods, these alloys are expensive and have limited applications. To reduce the cost of making beryllium-aluminum components, Nuclear Metals Inc. (NMI) and Lockheed Martin Electronics and Missiles have recently developed a family of patented beryllium-aluminum alloys that can be investment cast. Designated Beralcast, the alloys can achieve substantial weight savings because of their high specific strength and stiffness. In some cases, weight has been reduced by up to 50% over aluminum investment casting. Beralcast is now being used to make thin wall precision investment castings for several advanced aerospace applications, such as the RAH-66 Comanche helicopter and F-22 jet fighter. This article discusses alloy compositions, properties, casting method, and the effects of cobalt additions on strength.

Nachtrab, W.T.; Levoy, N. [Nuclear Metals Inc., Concord, MA (United States)

1997-05-01

223

14 CFR 27.621 - Casting factors.  

Code of Federal Regulations, 2010 CFR

...section must be applied in addition to those necessary to establish foundry quality control. The inspections must meet approved specifications...d)(1) of this section when an approved quality control procedure is established. (3) For castings procured to a...

2010-01-01

224

14 CFR 29.621 - Casting factors.  

Code of Federal Regulations, 2010 CFR

...section must be applied in addition to those necessary to establish foundry quality control. The inspections must meet approved specifications...d)(1) of this section when an approved quality control procedure is established. (3) For castings procured to a...

2010-01-01

225

Thin section casting program: Volume 2, Horizontal TSC (thin-section casting) approach: Final report  

SciTech Connect

In horizontal thin-section casting (HTSC), 1-inch-thick steel sections are produced at speeds up to 600 ipm or about 60 tons per hour per foot of width (tphf). Liquid steel is fed from the ladle, and flows through a specially designed tundish, then flows through a refractory feeding tube, nozzle, with approximately the same external dimensions as the cast section, into a near-horizontal rectangular mold whose all four sides are traveling in the same direction and speed as the steel casting. This report is the second of a six volume set on thin section casting. This volume covers the research on horizontal TSC. 5 refs.

Not Available

1989-01-01

226

WinMod: An expert advisor for investment casting  

SciTech Connect

Investment casting is an important method for fabricating a variety of high quality components in mechanical systems. Cast components, unfortunately, have a large design and gate/runner build time associated with their fabrication. In addition, casting engineers often require many years of actual experience in order to consistently pour high quality castings. Since 1989, Sandia National Laboratories has been investigating casting technology and software that will reduce the time overhead involved in producing quality casts. Several companies in the casting industry have teamed up with Sandia to form the FASTCAST Consortium. One result of this research and the formation of the FASTCAST consortium is the creation of the WinMod software, an expert casting advisor that supports the decision making process of the casting engineer through visualization and advice to help eliminate possible casting defects.

Bivens, H.P.; Williamson, G.A. Jr.; Luger, G.F. [Univ. of New Mexico, Albuquerque, NM (United States). Computer Science Dept.; Erdmann, R.G. [Univ. of Arizona, Tucson, AZ (United States). Dept. of Materials Science and Engineering; Maguire, M.C.; Baldwin, M.D.; Anderson, D.J. [Sandia National Labs., Albuquerque, NM (United States)

1998-04-01

227

Combination Of Investment And Centrifugal Casting  

NASA Technical Reports Server (NTRS)

Modifications, including incorporation of centrifugal casting, made in investment-casting process reducing scrap rate. Used to make first- and second-stage high-pressure-fuel-turbopump nozzles, containing vanes with thin trailing edges and other thin sections. Investment mold spun for short time while being filled, and stopped before solidification occurs. Centrifugal force drives molten metal into thin trailing edges, ensuring they are filled. With improved filling, preheat and pour temperatures reduced and solidification hastened so less hot tearing.

Creeger, Gordon A.

1994-01-01

228

Cast alloys for gas turbine vanes  

Microsoft Academic Search

1.The investigation of the casting properties and manufacture of turbine vanes showed that it is possible to use investment casting for gas turbine vanes of the experimental alloys tested.2.In alloys hardened with aluminum and titanium (alloys 1 and 2) the maximum short-term strength was retained to higher temperatures than for the alloys hardened with aluminum and niobium (alloy 3) or

M. N. Efimova; E. N. Masaleva

1971-01-01

229

Computed Tomography For Internal Inspection Of Castings  

NASA Technical Reports Server (NTRS)

Computed tomography used to detect internal flaws in metal castings before machining and otherwise processing them into finished parts. Saves time and money otherwise wasted on machining and other processing of castings eventually rejected because of internal defects. Knowledge of internal defects gained by use of computed tomography also provides guidance for changes in foundry techniques, procedures, and equipment to minimize defects and reduce costs.

Hanna, Timothy L.

1995-01-01

230

Gray Cast-Iron Water Pipe Metallurgy  

Microsoft Academic Search

Abstract: The results of a,metallographic study of grey,cast iron water pipes are reported. These pipes had been installed between 1885 and 1973 in eight different water systems. Each pipe had been extracted during scheduled maintenance,or failure repairs to provide data for a larger study toproduce,a methodology ,for determining ,the residual life of grey ,cast iron pipes. This metallographic study was

J. M. Rajani

2000-01-01

231

Generalized hair casts due to traction.  

PubMed

Peripilar keratin casts, also called pseudonits or hair casts, are thin, elongated, greyish-white, cylindrical, sleeve-like structures that encircle the hair shaft and can easily be slid along the hair. They may be clinically misdiagnosed as nits. In addition to physical removal, keratolytic lotions or shampoos are helpful. We report an 11-year-old girl with pseudonits. Although it is not a rare condition, underdiagnosis is common. PMID:23909653

Ozuguz, Pinar; Kacar, Seval; Takci, Zennure; Ekiz, Ozlem; Kalkan, Goknur; Bulbul Sen, Bilge

2013-01-01

232

Embedding Optical Fibers In Cast Metal Parts  

NASA Technical Reports Server (NTRS)

Use of metal strain reliefs eliminates breakage of fibers during casting process. Technique for embedding fused silica optical fibers in cast metal parts devised. Optical fiber embedded in flange, fitting, or wall of vacuum or pressure chamber, to provide hermetically sealed feedthrough for optical transmission of measurement or control signals. Another example, optical-fiber temperature sensor embedded in metal structural component to measure strain or temperature inside component.

Gibler, William N.; Atkins, Robert A.; Lee, Chung E.; Taylor, Henry F.

1995-01-01

233

PodCasting in het biomedisch onderwijs  

Microsoft Academic Search

Samenvatting  \\u000a Inleiding: Het digitaal opnemen en als PodCast aanbieden van hoorcolleges aan studenten wint aan populariteit. Er is echter weinig bekend\\u000a over de invloed hiervan op het studiegedrag en op de effectiviteit. Deze retrospectieve observationele studie geeft antwoord\\u000a op de volgende vragen: 1) Hoe beïnvloeden PodCasts de participatie in het contactonderwijs en het studiegedrag, en 2) Wat\\u000a is het effect

H. van Rijen; A. Freriksen; M. van Emst; M. van Hoeij; M. Spinder; W. Hols; O. ten Cate

2010-01-01

234

Apollo 14 composite casting demonstration  

NASA Technical Reports Server (NTRS)

This program assisted in the design and implementation of the composite casting demonstration for the Apollo 14 mission. Both flight and control samples were evaluated. Some conclusions resulting from a comparison of the flight and control samples were: (1) Solidification in neither the flight nor control samples was truly directional. (2) Apparent intermittent contact of the melt with the container in the flight samples led to unusual nucleation and growth structures. (3) There was greater uniformity, on a macro scale, of both pores and structural features in the flight sample; presumably the result of the reduced gravity conditions. (4) It seems quite feasible to produce enhanced dispersions of gases and dense phases in a melt which is solidified in reduced gravity. (5) A two-stage heating/cooling cycle may help directional solidification. (6) Sample materials should be selected from materials in which the dispersant fully wets the matrix material. (7) Experiments should be conducted in two modes: (1) where the melt is in good thermal contact with the container, and (2) where the melt is in a free-float condition.

1971-01-01

235

CS/EE 181a 2008/09 CAST Lecture CAST is both a language and a toolkit originally de-  

E-print Network

CS/EE 181a 2008/09 CAST Lecture CAST is both a language and a toolkit originally de- signed Rule? · How to get the most out of the CAST language. Basic idea: describe circuits digitally in a programming notation, build them with magic, check that you built what you intended. CAST is used

Martin, Alain

236

CS/EE 181a 2013/2014 CAST Lecture CAST is both a language and a toolkit originally de-  

E-print Network

CS/EE 181a 2013/2014 CAST Lecture CAST is both a language and a toolkit originally de- signed Rule? · How to get the most out of the CAST language. Basic idea: describe circuits digitally in a programming notation, build them with magic, check that you built what you intended. CAST is used

Martin, Alain

237

CYRANO CAST LIST: All Cast members need to be measured in the costume shop before semester break. Please  

E-print Network

CYRANO CAST LIST: All Cast members need to be measured in the costume shop before semester break: Anna Morreale #12;The Serpent Lady Cast List FARRUSCAD; Casey James CHERESTANI; Adia Alli CANZADE/s CHERESTANI); Katherine Schooler FULMINA; Jenna Jo Pawlicki TERRAMOTA; Marley Boone Peter Pan Cast List PETER

Liu, Taosheng

238

CS/EE 181a 2010/2011 CAST Lecture CAST is both a language and a toolkit originally de-  

E-print Network

CS/EE 181a 2010/2011 CAST Lecture CAST is both a language and a toolkit originally de- signed Rule? · How to get the most out of the CAST language. Basic idea: describe circuits digitally in a programming notation, build them with magic, check that you built what you intended. CAST is used

Martin, Alain

239

Reinforcement of Aluminum Castings with Dissimilar Metals  

SciTech Connect

The project ''Reinforcement of Aluminum Casting with Dissimilar Metal'' was a Cooperative Research and Development Agreements (CRADAs) between Oak Ridge National Laboratory (ORNL) and Cummins Inc. This project, technologies have been developed to reinforce aluminum castings with steel insert. Defect-free bond between the steel insert and the aluminum casting has been consistently obtained. The push-out experiment indicated that the bond strength is higher than that of the Al-Fin method. Two patents have been granted to the project team that is comprised of Cummins Inc. and ORNL. This report contains four sections: the coating of the steel pins, the cast-in method, microstructure characterization, and the bond strength. The section of the coating of the steel pins contains coating material selection, electro-plating technique for plating Cu and Ni on steel, and diffusion bonding of the coatings to the steel. The section of cast-in method deals with factors that affecting the quality of the metallurgical bond between the coated steel and the aluminum castings. The results of microstructure characteristics of the bonding are presented in the microstructure characterization section. A push-out experiment and the results obtained using this method is described in the section of bond strength/mechanical property.

Han, Q

2004-01-07

240

Slip casting of partially stabilized zirconia  

SciTech Connect

The toughness of partially-stabilized zirconia has been studied for some time. The tetragonal phase in partially stabilized ZrO2 transforms to the monoclinic phase under the influence of stress. Partially-stabilized ZrO2 has enhanced tensile strength, good wear resistance and low friction coefficient, and has found industrial applications. This article describes the use of partially-stabilized zirconia in slip casting. Lab techniques of slip casting have been reported for nonplastic materials such as Al2O3, CaF2, CaO-stabilized ZrO2 and MgO. The article discusses the variation of slip density and firing temperature and also reports the preparation of specimens of CaOstabilized ZrO2 by slip casting from ethanol-based suspensions. The preparation of Y2O3-ZrO2 compositions by slip casting from aqueous suspension is also reported. A Y2O3 partially stabilized ZrO2 powder was used as a starting material. The densities of the cast specimens were measured from the volume and weight, and those of the sintered specimens were measured by a liquid displacement technique using distilled water. The concentation of the suspension strongly affects the relative density of the cast specimen and the firing shrinkage of the sintered specimen, while the relative density of the sintered specimen is independent of the concentration of the suspension.

Taguchi, H.; Miyamoto, H.; Takahashi, Y.

1985-02-01

241

National Metal Casting Research Institute final report. Volume 2, Die casting research  

SciTech Connect

Four subprojects were completed: development and evaluation of die coatings, accelerated die life characterization of die materials, evaluation of fluid flow and solidification modeling programs, selection and characterization of Al-based die casting alloys, and influence of die materials and coatings on die casting quality.

Jensen, D. [University of Northern Iowa, Cedar Falls, IA (United States). Dept. of Industrial Technology] [comp.

1994-06-01

242

Multiscale modeling for the prediction of casting defects in investment cast aluminum alloys  

Microsoft Academic Search

Macroscopic modeling of heat transfer and fluid flow is now routinely used for the prediction of macroscopic defects in castings, while microscopic models are used to investigate the effects of alloy changes on typical microstructures. By combining these two levels of modeling it is possible to simulate the casting process over a wider range of spatial and temporal scales. This

R. W Hamilton; D See; S Butler; P. D Lee

2003-01-01

243

Precision Casting via Advanced Simulation and Manufacturing  

NASA Technical Reports Server (NTRS)

A two-year program was conducted to develop and commercially implement selected casting manufacturing technologies to enable significant reductions in the costs of castings, increase the complexity and dimensional accuracy of castings, and reduce the development times for delivery of high quality castings. The industry-led R&D project was cost shared with NASA's Aerospace Industry Technology Program (AITP). The Rocketdyne Division of Boeing North American, Inc. served as the team lead with participation from Lockheed Martin, Ford Motor Company, Howmet Corporation, PCC Airfoils, General Electric, UES, Inc., University of Alabama, Auburn University, Robinson, Inc., Aracor, and NASA-LeRC. The technical effort was organized into four distinct tasks. The accomplishments reported herein. Task 1.0 developed advanced simulation technology for core molding. Ford headed up this task. On this program, a specialized core machine was designed and built. Task 2.0 focused on intelligent process control for precision core molding. Howmet led this effort. The primary focus of these experimental efforts was to characterize the process parameters that have a strong impact on dimensional control issues of injection molded cores during their fabrication. Task 3.0 developed and applied rapid prototyping to produce near net shape castings. Rocketdyne was responsible for this task. CAD files were generated using reverse engineering, rapid prototype patterns were fabricated using SLS and SLA, and castings produced and evaluated. Task 4.0 was aimed at developing technology transfer. Rocketdyne coordinated this task. Casting related technology, explored and evaluated in the first three tasks of this program, was implemented into manufacturing processes.

1997-01-01

244

The effect of ramping casting speed and casting temperature on temperature distribution and melt flow patterns in the sump of a DC cast billet  

Microsoft Academic Search

The interpretation of experimental results obtained upon direct-chill (DC) casting frequently requires knowledge of the shape and position of liquidus and solidus isotherms and of the flow patterns in the billet sump. Computer simulations for the steady-state casting conditions are usually used to obtain such information, although experiments are frequently performed under transient casting conditions, e.g. at a ramping casting

Q. Du; D. G. Eskin; L. Katgerman

2005-01-01

245

Predicting Pattern Tooling and Casting Dimensions for Investment Casting - Phase II  

SciTech Connect

The investment casting process allows the production of complex-shape parts and close dimensional tolerances. One of the most important phases in the investment casting process is the design of the pattern die. Pattern dies are used to create wax patterns by injecting wax into dies. The wax patterns are used to create a ceramic shell by the application of a series of ceramic coatings, and the alloy is cast into the dewaxed shell mold (Fig. 1.1). However, the complexity of shape and the close dimensional tolerances required in the final casting make it difficult to determine tooling dimensions. The final linear dimension of the casting depends on the cumulative effects of the linear expansions or contractions in each step of the investment casting process (Fig. 1.2). In most cases, the mold geometry or cores restrict the shrinkage of the pattern or the cast part, and the final casting dimensions may be affected by time-dependent processes such as viscoelastic deformation of the wax, and viscoplastic creep and plastic deformations of the shell and alloy. The pattern die is often reworked several times to produce castings whose dimensions are within acceptable tolerances. To date, investment casting technology has been based on hands-on training and experience. Technical literature is limited to experimental, phenomenological studies aimed at obtaining empirical correlations for quick and easy application in industry. The goal of this project was to predict casting dimensions for investment castings in order to meet blueprint nominal during the first casting run. Several interactions have to be considered in a coupled manner to determine the shrinkage factors: these are the die-wax, wax-shell, and shell-alloy interactions (as illustrated in Fig. 1.3). In this work, the deformations of the die-wax and shell-alloy systems were considered in a coupled manner, while the coupled deformation of the wax-shell system was not considered. Future work is needed in order to deliver to industry a computer program in which all three systems are coupled for determining the dimensions of the wax pattern, the shell mold, and casting in a sequential but coupled manner.

Sabau, Adrian S [ORNL

2005-09-01

246

Unique morphology of intratubular light chain casts in multiple myeloma: The amyloid cast nephropathy.  

PubMed

Cast nephropathy is the most frequent pattern of renal involvement in multiple myeloma characterized by presence of tubular casts with characteristic morphology that are composed of monotypic (either kappa or lambda) light chains as seen by immunofluorescence microscopy. Rarely these casts may show evidence of amyloidogenesis and assume a unique morphology, which needs to be appreciated for arriving at accurate diagnosis. We present the case of an elderly male presenting with features of acute kidney injury and detected with extensive inspissation of intratubular casts with lambda light chain restriction and a unique morphology with spiculated congophilic periphery. Further investigations confirmed the presence of systemic myeloma. Presence of intratubular amyloid casts is a rare occurrence which needs to be recognized by the pathologist and forms a vital element in timely diagnosis of the systemic disease which often presents with renal involvement. PMID:25308025

Sharma, Alok; Bansal, Savita; Jain, Ramesh

2014-01-01

247

Mould design and casting process improvement on vibrator shell  

NASA Astrophysics Data System (ADS)

Vibrator shell is a part with complex structure. While the vibrator shell is designed and manufactured by traditional sand casting process, more than 80% castings are found the defects of porosity, shrinkage and pouring-shortage at the top. Aiming to the problems in traditional sand casting, this paper focused on the improvement of castings structure and the optimization of casting process. Designing process bar in the gate-channel region which is connected with the gate in castings is used to improve the castings structure, and low speed filling and solidification under high pressure are adopted to optimize the casting process which is finished by self-made four-column type hydraulic machine equipped. It can be seen that the castings quality can be greatly improved by process improvement.

Zhang, Lipan; Fang, Ligao; Chen, Zhong; Song, Kai

2011-12-01

248

Microstructure of thin-wall ductile iron castings  

SciTech Connect

The automotive industry is seeking to replace current car parts made of aluminum and iron castings with thin wall (down to 2 mm) iron castings to reduce the cost and weight of automobiles. The mechanical properties of thin wall ductile iron castings are affected strongly by the thickness of the castings. The thinner castings cool at a faster rate, and microstructural features that form during solidification, and subsequently, transform in the solid state, are strongly dependent on a geometrical parameter related to the ratio of surface area-to-volume of the casting. As this ratio becomes larger, castings cool faster. As a result, the nodule count on the observation plane of the specimens increases dramatically (>2000 nodules/mm2 in most specimens), i.e. as the thickness of castings decreases. Also, the matrix of the thin walled ductile iron castings becomes more ferritic as the ratio of surface area-to-volume decreases.

Dogan, Omer N.; Schrems, Karol K.; Hawk, Jeffrey A.; Druschitz, A.P. (Intermet Corp., Lynchburg, VA)

2001-10-01

249

The CAST Manual John Yen*, Thomas R. Ioerger^, Michael S. Miller^, Shuang Sun*,  

E-print Network

The CAST Manual John Yen*, Thomas R. Ioerger^, Michael S. Miller^, Shuang Sun*, Kaivan Kamali................................................................................................................. 4 3. About CAST ........................................................................................................... 6 3.3. CAST architecture

250

Biliary cast syndrome in an opium inhaler.  

PubMed

Biliary cast syndrome (BCS) is an uncommon complication which is mostly described in orthotopic liver transplantation. However, BCS has also been reported rarely in non-liver transplant patients. We describe a male long-term opium inhaler with BCS who underwent successful endoscopic cast removal by balloon enteroscopy-guided endoscopic retrograde cholangiopancreatography. A 52-year-old man, who was a known case of opium addiction, presented with the chief complaint of epigastric pain for 1 week prior to admission. Routine laboratory evaluation revealed cholestatic liver enzyme elevation. A cholestatic pattern was seen in radiographic modalities. Endoscopic retrograde cholangiopancreatography showed a linear filling defect in the intra- and extrahepatic duct. A long biliary cast was successfully removed using an extractor balloon. After removal of the biliary cast the patient is receiving ursodeoxycholic acid and does not report any problem 4 months after treatment. It seems that biliary dyskinesia due to long-term opium use can be a predisposing factor for biliary cast formation. PMID:24163648

Dabiri, Reza; Aghdae, Hamid Asadzadeh; Rajabalinia, Hasan; Mohammad Alizadeh, Amir Houshang

2013-01-01

251

Biliary Cast Syndrome in an Opium Inhaler  

PubMed Central

Biliary cast syndrome (BCS) is an uncommon complication which is mostly described in orthotopic liver transplantation. However, BCS has also been reported rarely in non-liver transplant patients. We describe a male long-term opium inhaler with BCS who underwent successful endoscopic cast removal by balloon enteroscopy-guided endoscopic retrograde cholangiopancreatography. A 52-year-old man, who was a known case of opium addiction, presented with the chief complaint of epigastric pain for 1 week prior to admission. Routine laboratory evaluation revealed cholestatic liver enzyme elevation. A cholestatic pattern was seen in radiographic modalities. Endoscopic retrograde cholangiopancreatography showed a linear filling defect in the intra- and extrahepatic duct. A long biliary cast was successfully removed using an extractor balloon. After removal of the biliary cast the patient is receiving ursodeoxycholic acid and does not report any problem 4 months after treatment. It seems that biliary dyskinesia due to long-term opium use can be a predisposing factor for biliary cast formation. PMID:24163648

Dabiri, Reza; Aghdae, Hamid Asadzadeh; Rajabalinia, Hasan; Mohammad Alizadeh, Amir Houshang

2013-01-01

252

The X-ray Telescope of CAST  

E-print Network

The Cern Axion Solar Telescope (CAST) is in operation and taking data since 2003. The main objective of the CAST experiment is to search for a hypothetical pseudoscalar boson, the axion, which might be produced in the core of the sun. The basic physics process CAST is based on is the time inverted Primakoff effect, by which an axion can be converted into a detectable photon in an external electromagnetic field. The resulting X-ray photons are expected to be thermally distributed between 1 and 7 keV. The most sensitive detector system of CAST is a pn-CCD detector combined with a Wolter I type X-ray mirror system. With the X-ray telescope of CAST a background reduction of more than 2 orders off magnitude is achieved, such that for the first time the axion photon coupling constant g_agg can be probed beyond the best astrophysical constraints g_agg < 1 x 10^-10 GeV^-1.

M. Kuster; H. Bräuninger; S. Cébrian; M. Davenport; C. Elefteriadis; J. Englhauser; H. Fischer; J. Franz; P. Friedrich; R. Hartmann; F. H. Heinsius; D. H. H. Hoffmann; G. Hoffmeister; J. N. Joux; D. Kang; K. Königsmann; R. Kotthaus; T. Papaevangelou; C. Lasseur; A. Lippitsch; G. Lutz; J. Morales; A. Rodríguez; L. Strüder; J. Vogel; K. Zioutas

2007-02-22

253

Numerical Optimization of the Method of Cooling of a Massive Casting of Ductile Cast-Iron  

NASA Astrophysics Data System (ADS)

The numerical models of the temperature field of solidifying castings, according to various authors, have been observing two main goals—directed solidification as the basic assumption for the healthiness of a casting and the optimization of the technology while maintaining the optimal product properties. The achievement of these goals is conditioned by the ability to analyze and, successively, to control the effect of the deciding factors, which either characterize the process or accompany it. An original application of ANSYS simulated the forming of the temperature field of a massive casting from ductile cast-iron during the application various methods of its cooling using steel chills. The numerical model managed to optimize more than one method of cooling but, in addition to that, provided serious results for the successive model of structural and chemical heterogeneity, and so it also contributes to influencing the pouring structure. The file containing the acquired results from both models, as well as from their organic unification, brings new and, simultaneously, remarkable findings of causal relationships between the structural and chemical heterogeneity (i.e. between the sizes of the spheroids of graphite, the cells, density of the spheroids of graphite, etc.) and the local solidification time in any point of the casting. The determined relations therefore enable the prediction of the face density of the spheroids of graphite in dependence on the local solidification time. The calculated temperature field of a two-ton 500×500×1000 mm casting of ductile cast-iron with various methods of cooling has successfully been compared with temperatures obtained experimentally. The casting was cast in sand mould. The calculated model of the kinetics of the temperature field of the casting was verified during casting with temperature measurements in selected points. This has created a tool for the optimization of the structure with an even distribution of the spheroids of graphite in such a way so as to minimize the occurrence of degenerated shapes of graphite, which happens to be one of the conditions for achieving good mechanical properties of castings of ductile cast-iron.

Dobrovska, Jana; Kavicka, Frantisek; Stransky, Karel; Sekanina, Bohumil; Stetina, Josef

2010-06-01

254

A new casting defect healing technology  

SciTech Connect

A new technology is presented for healing of defects in 356 aluminium alloys that provides economic upgrading of these cast alloys. It uses pneumatic isostatic forging (PIF) to produce high quality Al alloys products with enhanced mechanical properties uniform throughout the part, allowing higher design allowables and increased usage of Al alloy castings. The fundamental mechanism underlying PIF is a single mode plastic deformation process that uses isostatic application of pressures for 10-30 seconds at temperature. The process can be integrated in-line with other production operations, i.e., using the latent heat from the previous casting step. Results of applying the PIF process indicate lower cost and significant improvement in mechanical properties that rival and often exceed corresponding properties of other technologies like hot isostatic pressing and related processes. This process offers many advantages that are described in this paper in addition to presenting case histories of property enhancement by PIF and the mechanism responsible for property enhancement.

Hodge, E.S.; Reddoch, T.W. [ForMat Industries, Inc., Knoxville, TN (United States); Viswanathan, S. [Oak Ridge National Lab., TN (United States)

1997-01-01

255

Broken People: Caste Violence Against India's "Untouchables"  

NSDL National Science Digital Library

Even though "the imposition of social disabilities on persons by reason of their birth in certain castes" was legally abolished under India's constitution in 1950, "untouchability" is still practiced today in much of rural India. The "untouchable" caste -- or Dalits, which literally means "broken people" -- comprises over one-sixth of India's population, or 160 million people. This 310-page report, recently issued by Human Rights Watch (HRW), documents the discrimination and violence suffered by Dalits under the societal rule of higher-caste groups in the Indian states of Bihar, Tamil Nadu, Maharashtra, Andhra Pradesh, Karnataka, and Gujarat. The report also examines the government's role in preserving the status quo by thwarting peaceful social activism and failing to abolish exploitative labor practices through appropriate legislation.

256

Fatigue of die cast zinc alloys  

SciTech Connect

The rotating bending fatigue limit of die cast zinc alloy 2, alloy 3, alloy 5, AcuZinc 5, and ZA-8 were determined as a part of an on-going program by ILZRO into the mechanical properties of die cast zinc. The stress-life (S-N) curves of alloys 3, 5, AcuZinc 5, and ZA-8 were determined previously. This presentation reports the results of the S-N curve for Alloy 2 and the calculated fatigue limits for all five alloys. During the previous stress-life testing, the samples were stopped at 10 million cycles and the fatigue limit for alloy 3, alloy 5, and AcuZinc 5 appeared to be higher and the fatigue limit for ZA-8 appeared to be lower than the values reported in the literature. This was further investigated in alloy 5 and ZA-8 by testing continuous cast bulk alloy 5 and ZA-8.

Schrems, K.K.; Dogan, O.N.; Goodwin, F.E. (International Lead Zinc Research Organization, Inc.)

2006-04-01

257

TiC reinforced cast chromium steels  

SciTech Connect

A series of new titanium carbide reinforced cast chromium steels were developed for wear applications. Objective of the program was to enhance wear resistant alloys and, if possible, improve mechanical properties. The new steels which were melted in a vacuum induction furnace contained 12 Cr, 3-5 Ti, 1-2 C in weight percent. Alloying with Ti changed the precipitate microstructure from Cr carbide to TiC dispersed in a martensitic matrix. Yield strength and impact resistance improved with Ti alloying. Wear rates of the cast Cr/TiC steels, (determined from high- and low-stress abrasion tests, erosion test, and scratch tests) were generally lower than both the as-cast and heat-treated AISI type 440°C steel and were often further reduced by increasing the Ti alloy concentration. The exceptions were the erosion test for which all materials had similar wear rate.

Dogan, Omer N.; Rawers, James C.; Hawk, Jeffrey A.; Schrems, Karol K.

2003-11-01

258

Cast Aluminum Alloy for High Temperature Applications  

NASA Technical Reports Server (NTRS)

Originally developed by NASA as high performance piston alloys to meet U.S. automotive legislation requiring low exhaust emission, the novel NASA alloys now offer dramatic increase in tensile strength for many other applications at elevated temperatures from 450 F (232 C) to about 750 F (400 C). It is an ideal low cost material for cast automotive components such as pistons, cylinder heads, cylinder liners, connecting rods, turbo chargers, impellers, actuators, brake calipers and rotors. It can be very economically produced from conventional permanent mold, sand casting or investment casting, with silicon content ranging from 6% to 18%. At high silicon levels, the alloy exhibits excellent dimensional stability, surface hardness and wear resistant properties.

Lee, Jonathan A.

2003-01-01

259

The CAST experiment: status and perspectives  

E-print Network

The status of the solar axion search with the CERN Axion Solar Telescope (CAST) will be discussed. Results from the first part of CAST phase II where the magnet bores were filled with \\hefour gas at variable pressure in order to scan \\ma up to 0.4 eV will be presented. From the absence of excess X-rays when the magnet was pointing to the Sun, we set a typical upper limit on the axion-photon coupling of $\\gag \\lesssim 2.17 \\times10^{-10}$GeV$^{-1}$ at 95% CL for \\ma$CAST phase II. Expectations for sensibilities will be given. Near future perspectives as well as more long term options for a new helioscope experiment will be evoked.

Esther Ferrer Ribas; for the CAST Collaboration

2009-12-21

260

Composites for Advanced Space Transportation Systems (CASTS)  

NASA Technical Reports Server (NTRS)

A summary is given of the in-house and contract work accomplished under the CASTS Project. In July 1975 the CASTS Project was initiated to develop graphite fiber/polyimide matrix (GR/PI) composite structures with 589K (600 F) operational capability for application to aerospace vehicles. Major tasks include: (1) screening composites and adhesives, (2) developing fabrication procedures and specifications, (3) developing design allowables test methods and data, and (4) design and test of structural elements and construction of an aft body flap for the Space Shuttle Orbiter Vehicle which will be ground tested. Portions of the information are from ongoing research and must be considered preliminary. The CASTS Project is scheduled to be completed in September 1983.

Davis, J. G., Jr. (compiler)

1979-01-01

261

Modeling of casting microstructures and defects  

SciTech Connect

Casting is an ancient art that has been a trial-and-error process for more than 4000 years. To predict the size, shape, and quality of a cast product, casting manufacturers typically cast full-size prototypes. If one part of the process is done incorrectly, the entire process is repeated until an acceptable product is achieved. One way to reduce the time, cost, and waste associated with casting is to use computer modeling to predict not only the quality of a product on the macro- scale, such as distortion and part shape, but also on the micro-scale such as grain defects. Modeling of solidification is becoming increasingly feasible with the advent of parallel computers. There are essentially two approaches to solidification modeling.The first is that of macro-modeling where heat transfer codes model latent heat release during solidification as a constant and based solely on the local temperature. This approach is useful in predicting large scale distortion and final part shape. The second approach, micro-modeling, is more fundamental. The micro-models estimate the latent heat release during solidification using nucleation and grain growth kinetics. Micro-models give insight into cast grain morphology and show promise in the future to predict engineering properties such as tensile strength. The micro-model solidification kinetics can be evaluated using first principles or they can be evaluated using experiments. This work describes an implementation of a micro-model for uranium which uses experimental results to estimate nucleation and growth kinetics.

Shapiro, A.B.; Summers, L.T.; Eckels, D.J.; Sahai, V.

1997-09-26

262

Effect of Phase Pressure on Casting Properties in Cold Chamber Die Casting Process  

NASA Astrophysics Data System (ADS)

This paper focuses on the parametric optimization of process parameter in cold chamber die casting for an industrial component (crank case). Three controllable factors of the cold chamber die casting process (namely: 1st phase pressure, 2nd phase pressure and limit switch position) were studied at three levels each by Taguchi's parametric approach and single-response optimization was conducted to identify the main factor controlling surface hardness, weight of casting and dimensional accuracy (?d). Castings were produced using aluminium alloy at recommended parameters through cold chamber die casting process. Analysis shows that in cold chamber die casting process the percentage contribution of 1st phase pressure, limit switch position and 2nd phase pressure for surface hardness is 84.17, 11.43 and 1.93 % respectively. While in the case of weight of cast component, the contribution of limit switch position is 52.26 %, followed by 1st phase pressure and 2nd phase pressure 34.77 and 9.65 % respectively. Further for ?d, contribution of 1st phase pressure is 64.55 %, limit switch position 27.71 % and 2nd phase pressure contributes 4.87 %.

Singh, R.; Kapoor, R.

2013-04-01

263

Fluxing agent for metal cast joining  

DOEpatents

A method of joining an aluminum cast member to an aluminum component. The method includes the steps of coating a surface of an aluminum component with flux comprising cesium fluoride, placing the flux coated component in a mold, filling the mold with molten aluminum alloy, and allowing the molten aluminum alloy to solidify thereby joining a cast member to the aluminum component. The flux preferably includes aluminum fluoride and alumina. A particularly preferred flux includes about 60 wt. % CsF, about 30 wt. % AlF.sub.3, and about 10 wt. % Al.sub.2 O.sub.3.

Gunkel, Ronald W. (Lower Burrell, PA); Podey, Larry L. (Greensburg, PA); Meyer, Thomas N. (Murrysville, PA)

2002-11-05

264

Enhancements in Magnesium Die Casting Impact Properties  

SciTech Connect

The need to produce lighter components in transportation equipment is the main driver in the increasing demand for magnesium castings. In many automotive applications, components can be made of magnesium or aluminum. While being lighter, often times the magnesium parts have lower impact and fatigue properties than the aluminum. The main objective of this study was to identify potential improvements in the impact resistance of magnesium alloys. The most common magnesium alloys in automotive applications are AZ91D, AM50 and AM60. Accordingly, these alloys were selected as the main candidates for the study. Experimental quantities of these alloys were melted in an electrical furnace under a protective atmosphere comprising sulfur hexafluoride, carbon dioxide and dry air. The alloys were cast both in a permanent mold and in a UBE 315 Ton squeeze caster. Extensive evaluation of tensile, impact and fatigue properties was conducted at CWRU on permanent mold and squeeze cast test bars of AZ91, AM60 and AM50. Ultimate tensile strength values between 20ksi and 30ksi were obtained. The respective elongations varied between 25 and 115. the Charpy V-notch impact strength varied between 1.6 ft-lb and 5 ft-lb depending on the alloy and processing conditions. Preliminary bending fatigue evaluation indicates a fatigue limit of 11-12 ksi for AM50 and AM60. This is about 0.4 of the UTS, typical for these alloys. The microstructures of the cast specimens were investigated with optical and scanning electron microscopy. Concomitantly, a study of the fracture toughness in AM60 was conducted at ORNL as part of the study. The results are in line with values published in the literature and are representative of current state of the art in casting magnesium alloys. The experimental results confirm the strong relationship between aluminum content of the alloys and the mechanical properties, in particular the impact strength and the elongation. As the aluminum content increases from about 5% in AM50 to over 9% in AZ91, more of the intermetallic Mg17Al12 is formed in the microstructure. For instance, for 15 increase in the aluminum content from AM50 to AM60, the volume fraction of eutectic present in the microstructure increases by 35%! Eventually, the brittle Mg17Al12 compound forms an interconnected network that reduces ductility and impact resistance. The lower aluminum in AM50 and AM60 are therefore a desirable feature in applications that call for higher impact resistance. Further improvement in impact resistance depends on the processing condition of the casting. Sound castings without porosity and impurities will have better mechanical properties. Since magnesium oxidizes readily, good melting and metal transfer practices are essential. The liquid metal has to be protected from oxidation at all times and entrainment of oxide films in the casting needs to be prevented. In this regard, there is evidence that us of vacuum to evacuate air from the die casting cavity can improve the quality of the castings. Fast cooling rates, leading to smaller grain size are beneficial and promote superior mechanical properties. Micro-segregation and banding are two additional defect types often encountered in magnesium alloys, in particular in AZ91D. While difficult to eliminate, segregation can be minimized by careful thermal management of the dies and the shot sleeve. A major source of segregation is the premature solidification in the shot sleeve. The primary solid dendrites are carried into the casting and form a heterogeneous structure. Furthermore, during the shot, segregation banding can occur. The remedies for this kind of defects include a hotter shot sleeve, use of insulating coatings on the shot sleeve and a short lag time between pouring into the shot sleeve and the shot.

David Schwam; John F. Wallace; Yulong Zhu; Srinath Viswanathan; Shafik Iskander

2000-06-30

265

OVERVIEW LOOKING SOUTH OF CONTAINMENT SYSTEM (TOP), SLAB CASTING MACHINE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

OVERVIEW LOOKING SOUTH OF CONTAINMENT SYSTEM (TOP), SLAB CASTING MACHINE AND RUN OUT WITH TRAVELING TORCH. MACHINE IS CASTING IN TWIN MOLD. - U.S. Steel, Fairfield Works, Continuous Caster, Fairfield, Jefferson County, AL

266

The industrial ecology of the iron casting industry  

E-print Network

Metal casting is an energy and materials intensive manufacturing process, which is an important U.S. industry. This study analyzes iron casting, in particular, for possible improvements that will result in greater efficiencies ...

Jones, Alissa J. (Alissa Jean)

2007-01-01

267

Molding procedure for casting a variety of alloys  

NASA Technical Reports Server (NTRS)

General procedure and molding sand composition for preparing molds usable for casting variety of alloys are developed. Molds are prepared from mixture of sand, sodium silicate binder, and organic liquid ester. Castings of radiographic quality are produced from various alloys.

Fontes, M. J.; Kourtides, D.; Leibfritz, E. R.

1970-01-01

268

Accuracy of successive casts for full-arch fixed prostheses.  

PubMed

This clinically simulated study examined the accuracy of full-arch impression materials using successive casts reproduced from single impressions. Materials tested included a polyether polyvinyl siloxane, medium viscosity material, and putty wash. Maxillary full-arch Dentoform models were created with four abutments prepared for complete crowns. Six impressions of each material produced successive first and second generation casts. Individual cast copings were then fabricated and assembled into full-arch fixed dental prostheses. Marginal discrepancies were measured on both the casts and Dentoform. Data analysis suggests insignificant differences between successive casts. However, among second generation casts, clinically similar marginal discrepancies were exhibited. Outcomes demonstrated that second generation casts enabled fabrication and assembly of full-arch restorations that were clinically equivalent to first generation casts obtained. PMID:20859561

Dounis, Kiki S; Dounis, Georgia; Ditmyer, Marcia M; Ziebert, Gerald J

2010-01-01

269

FINISHED CASTINGS ARE ONLY GROUND BEFORE THEY ARE SHIPPED TO ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

FINISHED CASTINGS ARE ONLY GROUND BEFORE THEY ARE SHIPPED TO CUSTOMERS WHO COMPLETE THE FINISHING IN THEIR OWN MACHINE SHOPS. - Southern Ductile Casting Company, Grinding & Shipping, 2217 Carolina Avenue, Bessemer, Jefferson County, AL

270

INTERIOR VIEW OF DEBITEUSE STORAGE ROOM USED FOR UNFINISHED CASTS. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

INTERIOR VIEW OF DEBITEUSE STORAGE ROOM USED FOR UNFINISHED CASTS. EACH CAST WEIGHS 1200 POUNDS. - Chambers-McKee Window Glass Company, Debiteuse, Clay Avenue Extension, Jeannette, Westmoreland County, PA

271

19. Inside the cast house at Furnace A. Molten iron ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

19. Inside the cast house at Furnace A. Molten iron flowed into eight ladles. The furnace was cast (or tapped) six times each day. - Central Furnaces, 2650 Broadway, east bank of Cuyahoga River, Cleveland, Cuyahoga County, OH

272

40 CFR 464.10 - Applicability; description of the aluminum casting subcategory.  

Code of Federal Regulations, 2012 CFR

...Applicability; description of the aluminum casting subcategory. 464.10...AND CASTING POINT SOURCE CATEGORY Aluminum Casting Subcategory § 464.10 Applicability; description of the aluminum casting subcategory. The...

2012-07-01

273

The Making of Stainless Steel Shapes by Casting and Powder Metallurgy.  

National Technical Information Service (NTIS)

Contents: Production by casting; Designation and composition of alloys, Melting practice, Molding practice for static casting, Sand molds - methods, finish and tolerance, Ceramic molds - methods, finish and tolerance, Centrifugal casting, Casting characte...

J. G. Kura, V. D. Barth, E. T. Hall, W. H. Safranek, H. O. McIntire

1967-01-01

274

Modeling of Reoxidation Inclusion Formation During Filling of Steel Castings Kent D. Carlson and Christoph Beckermann  

E-print Network

Modeling of Reoxidation Inclusion Formation During Filling of Steel Castings Kent D. Carlson, IA 52242, USA Keywords: Reoxidation inclusion, steel casting, simulation, inclusion modeling Abstract of steel castings and predicts their final location in the casting. Inclusions can be released

Beckermann, Christoph

275

40 CFR 464.40 - Applicability; description of the zinc casting subcategory.  

Code of Federal Regulations, 2010 CFR

...false Applicability; description of the zinc casting subcategory. 464.40 Section...MOLDING AND CASTING POINT SOURCE CATEGORY Zinc Casting Subcategory § 464.40 Applicability; description of the zinc casting subcategory. The...

2010-07-01

276

Effect of Pressure Difference on the Quality of Titanium Casting  

Microsoft Academic Search

In casting titanium using a two-compartment casting machine, Herø et al. (1993) reported that the pressure difference between the melting chamber and the mold chamber affected the soundness of the castings. This study tested the hypothesis that differences in pressure produce castings with various amounts of porosity and different mechanical properties values. Plastic dumbbell-shaped patterns were invested with an alumina-based,

I. Watanabe; J. H. Watkins; H. Nakajima; M. Atsuta; T. Okabe

1997-01-01

277

Casting the Spirit: A Handmade Legacy  

ERIC Educational Resources Information Center

This article discusses how an art therapist working in a hospital palliative care unit has incorporated a ritual of hand casting to help bring closure to dying patients and family members who are grieving as death approaches. The finished hand sculptures depict the hands of the patients and, sometimes, of their loved ones. They are faithful and…

Rutenberg, Mona

2008-01-01

278

Die Soldering in Aluminium Die Casting.  

National Technical Information Service (NTIS)

Two types of tests, dipping tests and dip-coating tests were carried out on small steel cylinders using pure aluminum and 380 alloy to investigate the mechanism of die soldering during aluminum die casting. Optical and scanning electron microscopy were us...

Q. Han, E. A. Kenik, S. Viswanathan

2000-01-01

279

Templates Aid Removal Of Defects From Castings  

NASA Technical Reports Server (NTRS)

Templates used to correlate defects in castings with local wall thicknesses. Placed on part to be inspected after coated with penetrant dye. Positions of colored spots (indicative of defects) noted. Ultrasonic inspector measures thickness of wall at unacceptable defects only - overall inspection not necessary.

Hendrickson, Robert G.

1992-01-01

280

Friction stir welding of aluminium casting alloys  

Microsoft Academic Search

It has been presented the results of testing of friction stir welding quality in relation to EN AC-43200 (AK9) and EN AC-45000 (AK64) aluminium casting alloys. The test joints were made with the use of the welding machine constructed on the basis of numerically controlled milling machines. The assessment of the joints quality was made basing oneself on the visual

Damian Miara; Adam Pietras

2012-01-01

281

Resin Vacuum Casting System for LED Screen  

Microsoft Academic Search

This paper mainly describes the resin vacuum casting system for LED screen which uses thin film degassing technology and meter mix technology. Thin film degassing technology is currently the most effective method. In this paper, we describe in detail its working model. And meter mix dispensing technology integrates metering pump and mixing pump. It mixes materials according to the demand.

Hong Robin; Wang Hongmei; Hu Ming

2010-01-01

282

Feature Analysis of ToxCast Compounds  

EPA Science Inventory

ToxCast was initiated by the US Environmental Protection Agency (EPA) to prioritize environmental chemicals for toxicity testing. Phase I generated data for 309 unique chemicals, mostly pesticide actives, that span diverse chemical feature/property space, as determined by quantu...

283

Die Soldering in Aluminium Die Casting  

Microsoft Academic Search

Two types of tests, dipping tests and dip-coating tests were carried out on small steel cylinders using pure aluminum and 380 alloy to investigate the mechanism of die soldering during aluminum die casting. Optical and scanning electron microscopy were used to study the morphology and composition of the phases formed during soldering. A soldering mechanism is postulated based on experimental

Q. Han; E. A. Kenik; S. Viswanathan

2000-01-01

284

Robotic system for deburring machined castings  

SciTech Connect

A robot has been established in a work cell to deburr machined aluminum and stainless steel castings. The work cell increases the speed and repeatability of the process. Descriptions of the work cell components, process requirements, programming techniques, and problems encountered during development are presented.

Lambrechts, R.J.

1986-09-01

285

Roll Casting of Al-25%Si  

SciTech Connect

Strip casting of Al-25%Si strip was tried using an unequal diameter twin roll caster. The diameter of the lower roll (large roll) was 1000 mm and the diameter of the upper roll (small roll) was 250 mm. Roll material was mild steel. The sound strip could be cast at the speeds ranging from 8 m/min to 12 m/min. The strip did not stick to the roll without the parting material. The primary Si, which existed at centre area of the thickness direction, was larger than that which existed at other area. The size of the primary Si was smaller than 0.2 mm. Eutectic Si was smaller 5 {mu}m. The as-cast strip was ranging from 2 mm to 3 mm thick and its width was 100 mm. The as-cast strip could be hot rolled down to 1 mm. The hot rolled strip was cold rolled. The primary Si became smaller and the pore occurred around the primary Si after the rolling.

Haga, Toshio [Osaka Institute of Technology, Omiya Asahiku Osaka city 535-8585 (Japan); Harada, Hideto [Graduate School of Osaka Institute of Technology, Omiya Asahiku Osaka city 535-8585 (Japan); Watari, Hisaki [Gunma University, Kiryu city, 376-8515 (Japan)

2011-05-04

286

Industrial motivations: Conceptual Automotive Styling Tools (CAST)  

E-print Network

Industrial motivations: Conceptual Automotive Styling Tools (CAST) Karan Singh #12;Conceptual. · Sweeps. · Steels. · Paint box. · Whats missing? A refinable digital 3D model. An automotive designers Freeform Local Global #12;Modeling interfaces · Tape Drawing. · ShapeTape. · Steels, Sweeps. · Pen, puck

Toronto, University of

287

Choice of Steel for Large Castings  

Microsoft Academic Search

Steel of grade 15Kh3M1FTsL with relatively simple alloying set is suggested. The steel possesses high mechanical properties and a low cold-shortness threshold. Joint inoculation of cast low-carbon Cr – Mo steel with vanadium and zirconium is shown to have advantages.

I. A. Borisov

2004-01-01

288

Joint CQSE and CASTS Seminar Weekly Seminar  

E-print Network

Joint CQSE and CASTS Seminar Weekly Seminar Dec. 13, 2013 (Friday) TIME Dec. 13, 14:30 ~ 15:30 TITLE Nondestructive Phase Shifting Imaging of Cold Atoms SPEAKER Prof. Dian-Jiun Han Department Nondestructive imaging of cold atoms relies on the phase shift of probe light while passing the atomic sample

Wu, Yih-Min

289

Joint CQSE and CASTS Seminar Weekly Seminar  

E-print Network

Joint CQSE and CASTS Seminar Weekly Seminar Dec. 14, 2012 (Friday) TIME Dec. 14, 14:30 ~ 15 Physics Building, NTU Abstract Recent cold atom researches are reaching out far beyond the realm-experiments are nowadays common targets of cold atom physicists. Two prominent examples will be outlined in this talk: BEC

Wu, Yih-Min

290

An Introduction to ToxCast?  

EPA Science Inventory

ToxCast? is a chemical prioritization research program to develop the ability to forecast toxicity using bioactivity profiling. The point is to use results in a variety of in vitro and rapid non-mammalian in vivo assays to explore effects at different toxicity targets. The desi...

291

Carburizer Effect on Cast Iron Solidification  

NASA Astrophysics Data System (ADS)

This paper presents the effect of carburizing materials on cast iron solidification and crystallization. The studies consisted of cast iron preparation from steel scrap and different carburizers. For a comparison, pig iron was exclusively used in a solid charge. Crystallization analysis revealed the influence of the carburizer material on the crystallization curves as well as differences in the solidification paths of cast iron prepared with the use of different charge materials. The carburizers' influence on undercooling during the eutectic crystallization process was analyzed. The lowest undercooling rate was recorded for the melt with pig iron, then for synthetic graphite, natural graphite, anthracite, and petroleum coke (the highest undercooling rate). So a hypothesis was formulated that eutectic cells are created most effectively with the presence of carbon from pig iron (the highest nucleation potential), and then for the graphite materials (crystallographic similarity with the carbon precipitation in the cast iron). The most difficult eutectic crystallization is for anthracite and petroleum coke (higher undercooling is necessary). This knowledge can be crucial when the foundry plant is going to change the solid charge composition replacing the pig iron by steel scrap and the recarburization process.

Janerka, Krzysztof; Kondracki, Marcin; Jezierski, Jan; Szajnar, Jan; Stawarz, Marcin

2014-06-01

292

Metalcasting: Die Casting Copper Motor Rotors  

SciTech Connect

Decreased energy requirements, air emissions, production time, and operating costs are some of the benefits that will accrue to the metalcasting industry as result of this new die casting technique. This fact sheet provides the details of this exciting new process for fabricating copper motor rotors.

Recca, L.

1999-01-29

293

Cast shadow segmentation using invariant color features  

Microsoft Academic Search

Shadows are integral parts of natural scenes and one of the elements contributing to nat- uralness of synthetic scenes. In many image analysis and interpretation applications, shadows interfere with fundamental tasks such as object extraction and description. For this reason, shadow segmentation is an important step in image analysis. In this paper, we propose a new cast shadow segmentation algorithm

Elena Salvador; Andrea Cavallaro; Touradj Ebrahimi

2004-01-01

294

Arsenic Removal from Drinking Water - Web cast  

EPA Science Inventory

Web cast presentation covered six topics: (1) Arsenic Chemistry, (2) Technology Selection/Arsenic Demonstration Program, (3) Case Study 1, (4) Caser Study 2, (5) Case Study 3, and (6) Media Regeneration Project. The presentation was considered a training session and consist of m...

295

CAST: Collaborative Agents for Simulating Teamwork  

Microsoft Academic Search

Psychological studies on teamwork have shown that an effective team often can anticipate information needs of teammates based on a shared mental model. Existing multi-agent models for teamwork are limited in their ability to support proactive information exchange among teammates. To address this issue, we have developed and implemented a multi-agent architecture called CAST that simulates teamwork and supports proactive

John Yen; Jianwen Yin; Thomas R. Ioerger; Michael S. Miller; Dianxiang Xu; Richard A. Volz

2001-01-01

296

Transient altitude-induced compartment syndrome associated with fiberglass casts using waterproof cast padding.  

PubMed

Changes in aircraft cabin pressure and its interplay with a fixed diameter fiberglass cylindrical cast and the closed air cells in waterproof cast padding may cause a transient altitude-induced compartment syndrome. In this case series, 2 patients reported transient compartment syndromes that resolved with aircraft decent. As proof of concept, this work displays photographic and video evidence showing the difference in air cell volume from experimental data in a vacuum chamber as well as real-world volume changes at cruise altitude in a commercial airliner. Transient altitude-induced compartment syndromes associated with fiberglass casts using waterproof cast padding are real and surgeons and patients should be advised of this potentially devastating complication. PMID:23431541

Kadzielski, John; Bae, Donald S

2013-01-01

297

Status of investment cast gamma titanium aluminides in the USA  

Microsoft Academic Search

Investment casting of gamma titanium aluminide alloys has become the near-term process of choice for component manufacture. This is largely due to its near-net shape processing capabilities which allow cast gamma components to be manufactured at a lower cost when compared with wrought or powder methods. Casting processes have been developed that are capable of producing aerospace quality components as

Donald E. Larsen

1996-01-01

298

Sensor-Based Assessment of Cast Placement and Removal  

PubMed Central

Appropriate pressure during the application of a cast is critical to provide adequate stabilization of fractures. Force-sensing resistors (FSR) were used to measure pressure during cast placement and removal. The data demonstrated a signature pattern of skin pressure during the different steps of cast placement and removal. This reproducible signal provides validity evidence for our model. PMID:24732518

MAAG, Anne-Lise D.; LAUFER, Shlomi; KWAN, Calvin; COHEN, Elaine R.; LENHART, Rachel L.; STORK, Natalie C.; HALANSKI, Matthew A.; PUGH, Carla M.

2014-01-01

299

New methods and materials for molding and casting ice formations  

NASA Technical Reports Server (NTRS)

This study was designed to find improved materials and techniques for molding and casting natural or simulated ice shapes that could replace the wax and plaster method. By utilizing modern molding and casting materials and techniques, a new methodology was developed that provides excellent reproduction, low-temperature capability, and reasonable turnaround time. The resulting casts are accurate and tough.

Reehorst, Andrew L.; Richter, G. Paul

1987-01-01

300

Democracy and the Recasting of Caste in India  

Microsoft Academic Search

The three books under review offer a fascinating account of how the processes of democracy and the practices of the modern Indian state have refashioned caste as an important feature of social stratification and self-definition. But the implication of the recasting of caste varies in the three accounts. According to Zoya Hasan, caste is an important marker of socio-economic backwardness

Juned Shaikh

2010-01-01

301

July 2008 Mold heat transfer in continuous casting  

E-print Network

July 2008 Mold heat transfer in continuous casting is important to mold life, surface quality, breakouts and many aspects of the process. Heat transfer in the thin slab casting mold is being investigated aspects of the continuous casting process, including shell and mold temperatures, heat flux, interfacial

Thomas, Brian G.

302

Preparation of alumina membranes by tape casting and dip coating  

Microsoft Academic Search

The preparation of an alumina ultrafiltration membrane with a mean pore size of 6.5 nm was performed by slip casting or tape casting of the support, dip coating or tape casting of the intermediate layer, followed by dip coating of the top layer. Controlled porosity and pore size in the support were obtained by the addition of starch particles which

Karin Lindqvist; Eva Lidén

1997-01-01

303

Shrinkage Prediction for the Investment Casting of Stainless Steels  

Microsoft Academic Search

In this study, the alloy shrinkage factors were obtained for the investment casting of 17-4PH stainless steel parts. For the investment casting process, unfilled wax and fused silica with a zircon prime coat were used for patterns and shell molds, respectively. Dimensions of the die tooling, wax pattern, and casting were measured using a Coordinate Measurement Machine in order to

Sabau; Adrian S

2007-01-01

304

TRANSPORT AND ENTRAPMENT OF PARTICLES IN CONTINUOUS CASTING OF STEEL  

E-print Network

TRANSPORT AND ENTRAPMENT OF PARTICLES IN CONTINUOUS CASTING OF STEEL Quan Yuan and Brian G. Thomas products. During continuous casting, particles may enter the mold with the steel flowing through. During continuous casting, particles may enter the mold with the steel flowing through the submerged

Thomas, Brian G.

305

Prediction of Reoxidation Inclusion Composition in Casting of Steel  

E-print Network

Prediction of Reoxidation Inclusion Composition in Casting of Steel Liang Wang and Christoph ABSTRACT A model is developed to calculate the composition of reoxidation inclusions in steel casting of Reoxidation Inclusion Composition in Casting of Steel," in Proceedings of the 59th SFSA Technical

Beckermann, Christoph

306

Prediction of Reoxidation Inclusion Composition in Casting of Steel  

E-print Network

Prediction of Reoxidation Inclusion Composition in Casting of Steel LIANG WANG and CHRISTOPH pouring of steel castings. The software package Thermo-Calc is used to obtain the inclusion phase in the production of steel castings. Removing inclusions and refilling the defect areas with the weld metal account

Beckermann, Christoph

307

Deformation during casting of steel: model and material C. Beckermann  

E-print Network

Deformation during casting of steel: model and material properties C. Monroe C. Beckermann hardening and strain rate dependence. Introduction Distortion in any steel casting is costly. Added is not presented. 1 Monroe, C., and Beckermann, C., "Deformation During Casting of Steel: Mold and Material

Beckermann, Christoph

308

Automatic optimal feeder design in steel casting process  

Microsoft Academic Search

A method for automatic optimal feeder design in steel casting processes is presented. The initial design is the casting part (without feeders) which is placed in a suitable mold box. Design of each feeder contains the following steps: determination of the feeder-neck connection point on the casting surface, initial feeder design, feeder shape optimization and feeder topology optimization. Completing designing

Rohallah Tavakoli; Parviz Davami

2008-01-01

309

A NEW STANDARD FOR RADIOGRAPHIC ACCEPTANCE CRITERIA FOR STEEL CASTINGS  

E-print Network

1 A NEW STANDARD FOR RADIOGRAPHIC ACCEPTANCE CRITERIA FOR STEEL CASTINGS Malcolm Blair and Raymond of steel castings. This standard allows the designer and user to specify acceptance criterion.A., and Beckermann, C., "A New Standard for Radiographic Acceptance Criteria for Steel Castings," in Proceedings

Beckermann, Christoph

310

Inclusion Removal by Bubble Flotation in a Continuous Casting Mold  

E-print Network

the removal of inclusions by bubbles during the continuous casting of steel. First, the attachment probability to quantify the removal of inclusions by bubbles in molten steel and applies them to the continuous casting elements. Bubbles injected into the SEN and continuous casting mold affect steel quality in several ways

Thomas, Brian G.

311

Numerical simulation of casting solidification in permanent metallic molds  

Microsoft Academic Search

Casting solidification is actually the transformation of liquid phase to solid phase with the liberation of latent heat of fusion. During this metallurgical process, it induces casting defects like shrinkage, porosity and hot tears. To eradicate and eliminate these problems, accurate casting design and proper design of gating system is necessary. This can be predicted and designed by means of

T. R. Vijayaram; S. Sulaiman; A. M. S. Hamouda; M. H. M. Ahmad

2006-01-01

312

Study on a CAD\\/CAE system of die casting  

Microsoft Academic Search

Increasing demans for premium quality, high productivity and cost-saving products provide powerful incentives to improve the way that die castings are made today. Research has shown that the fluid flow of the liquid metal and the temperature distribution of the dies and the die castings have a critical influence on the quality of the cast products, on the production rate

Zhang Weishan; Xiong Shoumei; Liu Baicheng

1997-01-01

313

A simplified thermal analysis of an inductively heated casting furnace  

Microsoft Academic Search

A simplified thermal analysis technique was developed to analyze an inductively heated casting furnace. Initial operation of the vacuum casting furnace indicated that the outer shell of the vessel was exceeding the temperature design limit. The casting furnace is very complex and not easily modeled in a short period of time through the use of general purpose heat transfer codes.

R. Clarksean; C. Solbrig

1995-01-01

314

49 CFR 192.755 - Protecting cast-iron pipelines.  

Code of Federal Regulations, 2010 CFR

...2010-10-01 2010-10-01 false Protecting cast-iron pipelines. 192.755 Section... Maintenance § 192.755 Protecting cast-iron pipelines. When an operator...that the support for a segment of a buried cast-iron pipeline is disturbed:...

2010-10-01

315

25 CFR 217.6 - Method of casting votes.  

Code of Federal Regulations, 2012 CFR

...superintendent in writing of the number of votes cast for and against the proposed or alternative...of the joint managers fails or refuses to cast his votes and to notify the superintendent...that such joint managers' votes have been cast against the proposed solution or...

2012-04-01

316

25 CFR 217.6 - Method of casting votes.  

...superintendent in writing of the number of votes cast for and against the proposed or alternative...of the joint managers fails or refuses to cast his votes and to notify the superintendent...that such joint managers' votes have been cast against the proposed solution or...

2014-04-01

317

49 CFR 192.755 - Protecting cast-iron pipelines.  

Code of Federal Regulations, 2013 CFR

...2013-10-01 2013-10-01 false Protecting cast-iron pipelines. 192.755 Section... Maintenance § 192.755 Protecting cast-iron pipelines. When an operator...that the support for a segment of a buried cast-iron pipeline is disturbed:...

2013-10-01

318

25 CFR 217.6 - Method of casting votes.  

Code of Federal Regulations, 2013 CFR

...superintendent in writing of the number of votes cast for and against the proposed or alternative...of the joint managers fails or refuses to cast his votes and to notify the superintendent...that such joint managers' votes have been cast against the proposed solution or...

2013-04-01

319

49 CFR 192.275 - Cast iron pipe.  

Code of Federal Regulations, 2013 CFR

...2013-10-01 2013-10-01 false Cast iron pipe. 192.275 Section 192...Materials Other Than by Welding § 192.275 Cast iron pipe. (a) Each caulked bell and spigot joint in cast iron pipe must be sealed with...

2013-10-01

320

49 CFR 192.275 - Cast iron pipe.  

Code of Federal Regulations, 2010 CFR

...2010-10-01 2010-10-01 false Cast iron pipe. 192.275 Section 192...Materials Other Than by Welding § 192.275 Cast iron pipe. (a) Each caulked bell and spigot joint in cast iron pipe must be sealed with...

2010-10-01

321

49 CFR 192.275 - Cast iron pipe.  

Code of Federal Regulations, 2012 CFR

...2012-10-01 2012-10-01 false Cast iron pipe. 192.275 Section 192...Materials Other Than by Welding § 192.275 Cast iron pipe. (a) Each caulked bell and spigot joint in cast iron pipe must be sealed with...

2012-10-01

322

49 CFR 192.755 - Protecting cast-iron pipelines.  

Code of Federal Regulations, 2012 CFR

...2012-10-01 2012-10-01 false Protecting cast-iron pipelines. 192.755 Section... Maintenance § 192.755 Protecting cast-iron pipelines. When an operator...that the support for a segment of a buried cast-iron pipeline is disturbed:...

2012-10-01

323

Simulation of Reoxidation Inclusion Formation in Steel Casting  

E-print Network

Simulation of Reoxidation Inclusion Formation in Steel Casting Antonio J. Melendez, Kent D. Carlson the formation of reoxidation inclusions in carbon and low-alloy steel castings. A model is developed in the casting simulation software MAGMAsoft. Measurements of total inclusion number density and volume fraction

Beckermann, Christoph

324

Modeling of Reoxidation Inclusion Formation During Filling of Steel Castings  

E-print Network

1 Modeling of Reoxidation Inclusion Formation During Filling of Steel Castings Kent D. Carlson cycle of inclusions during the filling of steel castings. There are two ways that inclusions can be introduced into the casting: inclusions can be released at the inlet to model tiny deoxidation or other

Beckermann, Christoph

325

49 CFR 192.275 - Cast iron pipe.  

Code of Federal Regulations, 2011 CFR

...2011-10-01 2011-10-01 false Cast iron pipe. 192.275 Section 192...Materials Other Than by Welding § 192.275 Cast iron pipe. (a) Each caulked bell and spigot joint in cast iron pipe must be sealed with...

2011-10-01

326

Beam casting implicit surfaces on the GPU with interval arithmetic  

E-print Network

Beam casting implicit surfaces on the GPU with interval arithmetic Francisco Ganacim, Luiz Henrique, Brazil Abstract--We present a GPU-based beam-casting method for rendering implicit surfaces in real time. INTRODUCTION Rendering surfaces with ray casting is perhaps the clearest example of a potentially

327

25 CFR 217.6 - Method of casting votes.  

Code of Federal Regulations, 2010 CFR

...superintendent in writing of the number of votes cast for and against the proposed or alternative...of the joint managers fails or refuses to cast his votes and to notify the superintendent...that such joint managers' votes have been cast against the proposed solution or...

2010-04-01

328

Effect of Shrinkage on Service Performance of Steel Castings  

E-print Network

Effect of Shrinkage on Service Performance of Steel Castings Richard Hardin and Christoph An overview of the objectives and progress made by the "Integrated Design of Steel Castings for Service service performance of steel castings with porosity are reviewed. Structural performance predictions

Beckermann, Christoph

329

AZIMUTHAL VARIATION OF RADIATION OF SEISMIC ENERGY FROM CAST BLASTS  

E-print Network

AZIMUTHAL VARIATION OF RADIATION OF SEISMIC ENERGY FROM CAST BLASTS D. Craig Pearson Brian W. Stump VARIATION OF RADIATION OF SEISMIC ENERGY FROM CAST BLASTS D. Craig Pearson and Brian W. Stump Los Alamos network of three-component seismic sensors were deployed around a large cast shot in the Black Thunder

330

Converge-Cast with MIMO , Xinbing Wang3  

E-print Network

Converge-Cast with MIMO Luoyi Fu1 , Yi Qin2 , Xinbing Wang3 , Xue Liu4 1,2,3 Depart. of Electronic, called converge-cast, where each of the n nodes in the network act as a destination with k ran- domly two many-to-one cooperative schemes under converge-cast for both static and mobile ad hoc networks

Wang, Xinbing

331

49 CFR 192.755 - Protecting cast-iron pipelines.  

Code of Federal Regulations, 2011 CFR

...2011-10-01 2011-10-01 false Protecting cast-iron pipelines. 192.755 Section... Maintenance § 192.755 Protecting cast-iron pipelines. When an operator...that the support for a segment of a buried cast-iron pipeline is disturbed:...

2011-10-01

332

Application of New Feeding Rules To Risering of Steel Castings  

E-print Network

1 Application of New Feeding Rules To Risering of Steel Castings Doug Smith , Tony Faivre , Shouzhu Engineering , ABC-NACO TECHNOLOGIES, Lombard, IL1 Project Engineer - Casting Simulation, ABC-NACO TECHNOLOGIES castings, and comparisons are made between these new rules and the feeding rules presently published

Beckermann, Christoph

333

Morphological castes in a vertebrate M. J. O'Riain*  

E-print Network

Morphological castes in a vertebrate M. J. O'Riain* , J. U. M. Jarvis , R. Alexander§ , R of reproduction in females. This is the only known example of morphological castes in a vertebrate and is distinct breeding vertebrates. The evolution of castes in a mammal and insects represents a striking example

Danchin, Etienne

334

Modelling of reoxidation inclusion formation in steel sand casting  

E-print Network

Modelling of reoxidation inclusion formation in steel sand casting A. J. Melendez, K. D. Carlson pouring, as well as their final locations on the surface of steel sand castings. Inclusions originate. The inclusion model is implemented in a general-purpose casting simulation code. The model is validated

Beckermann, Christoph

335

25 CFR 217.6 - Method of casting votes.  

Code of Federal Regulations, 2011 CFR

...superintendent in writing of the number of votes cast for and against the proposed or alternative...of the joint managers fails or refuses to cast his votes and to notify the superintendent...that such joint managers' votes have been cast against the proposed solution or...

2011-04-01

336

EFFECT OF POROSITY ON MECHANICAL PROPERTIES OF 8630 CAST STEEL  

E-print Network

EFFECT OF POROSITY ON MECHANICAL PROPERTIES OF 8630 CAST STEEL R.A. Hardin1 and C. Beckermann2 1.A., and Beckermann, C., "Effect of Porosity on Mechanical Properties of 8630 Cast Steel," in Proceedings of the 58th of steel castings. Likewise there are no guidelines relating non-destructive testing or non- destructive

Beckermann, Christoph

337

MODELING OF POROSITY FORMATION AND FEEDING FLOW IN STEEL CASTING  

E-print Network

MODELING OF POROSITY FORMATION AND FEEDING FLOW IN STEEL CASTING Kent D. Carlson, Zhiping Lin pressure, feeding flow, and porosity formation and growth in steel castings during solidification-phase model has been successfully implemented in a general-purpose casting simulation code. Results

Beckermann, Christoph

338

Modelling the dip coating process for hot metal castings  

E-print Network

Modelling the dip coating process for hot metal castings Mark J. McGuinness #3; A.J. Roberts y The Problem 3 2 Fluidised Beds 4 3 Material properties 6 4 Time to heat castings in furnace 6 4.1 Sensitivity Transfer CoeÃ?cient . . . . . . . . . . . . . . . . . . . . 12 5.2 Change in temperature of castings

McGuinness, Mark

339

Biological activity of earthworm casts: An assessment of plant growth promotor levels in the casts  

Microsoft Academic Search

Biochemical analyses and auxin and cytokinin bioassays were performed to test the biological activity of wormcasts. Both cellulose\\u000a paper pulp and soil casts ofLampito mauritii were rich in ammonia, urea, organic carbon content, organic matter, soluble phosphorus and ionic potassium levels. The total\\u000a nitrogen content of the soil remained unaffected by worm activations. The casts ofLampito mauritii, Pheretima elongata, Pontoscolex

R V Krishnamoorthy; S N Vajranabhaiah

1986-01-01

340

Viability changes: Microbiological analysis of dental casts  

PubMed Central

Background This study evaluated the survival of the most prevalent oral bacteria and fungi (Staphylococcus aureus, Klebsiella pneumoniae, Escherichia coli, and Candida albicans) in dental casts, and compared changes in the amounts of these microorganisms at different time intervals to determine how long dental casts may pose threat to the health of dental personnel and patients. Material/Methods When manufacturing the casts, regular water was replaced with sterile distilled water, where suspensions of the studied bacteria or the fungus at certain concentrations were prepared. When the dental casts were fully set (solidified), plaster shavings were examined immediately after the contact of the studied microorganism with the plaster, as well as after 1, 2, 24, 48, 72, 96, and 120 hours. Following that, we measured how the amount of the studied bacteria and fungi in 1 gram of the plaster changed within the studied period of time. Results Klebsiella pneumoniae survived in plaster for up to 4 days, and the reduction in the number of these bacteria became statistically significant after 1 day (p<0.05). Staphylococcus aureus remained viable in plaster for up to 4 days, and the number of these bacteria dropped after 1 day (p<0.05). Escherichia coli disappeared after 2 days, and a reduction was already observed after 2 hours (p<0.05). Candida albicans in plaster models died within 2 days, and a reduction in their number was observed after 1 day (p<0.05). Conclusions The microorganisms did not multiply in the gypsum casts and their number significantly dropped instead of increasing. PMID:24902637

Zilinskas, Juozas; Junevicius, Jonas; Ramonaite, Agne; Pavilonis, Alvydas; Gleiznys, Alvydas; Sakalauskiene, Jurgina

2014-01-01

341

Corrosion behaviour of high pressure die-cast and semi-solid cast AZ91D alloys  

Microsoft Academic Search

The microstructure and the corrosion behaviour of high pressure die-cast and semi-solid cast AZ91D magnesium alloys have been investigated. Semi-solid processing leads to a structure with large rounded grains of a solid solution of magnesium (? phase) whereas die-cast alloys are more homogeneous. Electrochemical measurements, particularly with impedance spectroscopy, have shown that the semi-solid cast alloy possesses a corrosion rate

S Mathieu; C Rapin; J Hazan; P Steinmetz

2002-01-01

342

Relationship between casting modulus and grain size in cast A356 aluminium alloys  

NASA Astrophysics Data System (ADS)

Microstructure of Al-Si alloy castings depends most generally on melt preparation and on the cooling rate imposed by the thermal modulus of the component. In the case of Al-Si alloys, emphasis is put during melt preparation on refinement of pro-eutectic (Al) grains and on modification of the Al-Si eutectic. Thermal analysis has been used since long to check melt preparation before casting, i.e. by analysis of the cooling curve during solidification of a sample cast in an instrumented cup. The conclusions drawn from such analysis are however valid for the particular cooling conditions of the cups. It thus appeared of interest to investigate how these conclusions could extrapolate to predict microstructure in complicated cast parts showing local changes in the solidification conditions. For that purpose, thermal analysis cups and instrumented sand and die castings with different thermal moduli and thus cooling rates have been made, and the whole set of cooling curves thus recorded has been analysed. A statistical analysis of the characteristic features of the cooling curves related to grain refinement in sand and die castings allowed determining the most significant parameters and expressing the cube of grain size as a polynomial of these parameters. After introduction of a further parameter quantifying melt refining an excellent correlation, with a R2 factor of 0.99 was obtained.

Niklas, A.; Abaunza, U.; Fernández-Calvo, A. I.; Lacaze, J.

2012-01-01

343

Characterization of Bimetallic Castings with an Austenitic Working Surface Layer and an Unalloyed Cast Steel Base  

NASA Astrophysics Data System (ADS)

The paper presents the technology of bimetallic castings based on the founding method of layer coating directly in the cast process of the so-called method of mold cavity preparation. The prepared castings consist of two fundamental parts, i.e., the base and the working surface layer. The base part of the bimetallic casting is typical foundry material, i.e., unalloyed cast steel, whereas the working layer is a plate of austenitic alloy steel sort X2CrNi 18-9. The quality of the joint between the base part and the working layer was evaluated on the basis of ultrasonic non-destructive testing and structure examinations containing metallographic macro- and microscopic studies with the use of a light microscope (LOM) with microhardness measurements and a scanning electron microscope (SEM) with microanalysis of the chemical composition (energy dispersive spectroscopy—EDS). On the basis of the obtained results it was confirmed that the decisive phenomena needed to create a permanent joint between the two components of the bimetallic casting are carbon and heat transport in the direction from the high-carbon and hot base material which was poured into the mold in the form of liquid metal to the low-carbon and cold material of the working layer which was placed in the mold cavity in the form of a monolithic insert.

Wróbel, Tomasz

2014-05-01

344

Influence of casting methods on marginal and internal discrepancies of complete cast crowns.  

PubMed

The relationship between the application of die-spacer prior to wax pattern fabrication and metal removal from the inner surface of the casting on marginal and internal discrepancies of complete cast crowns was evaluated. One hundred and twenty complete crowns were cast with palladium-silver alloy melted by gas-oxygen torch or electrical resistance and cast with a centrifuge casting machine. After casting, the crowns were seated on each type of different marginal configuration dies (90-degree shoulder, 20-degree beveled shoulder, and 45-degree chamfered shoulder) with a static load of 90 N during 1 min. Evaluation of the marginal fit of the specimens was made using a digital micrometer. The crowns were embedded in acrylic resin and longitudinally sectioned to verify the internal discrepancy that occurred in lateral and occlusal interfaces with a digital micrometer. The data were submitted to ANOVA and Tukey's test with a significance level of 5%. The best marginal and inner fits were obtained with the gas-oxygen torch source. The 45-degree chamfered shoulder showed the best marginal and inner fit, and better internal relief was obtained in the crowns abraded with 50 microm Al2O3 particles. PMID:15776195

Milan, Fábio Machado; Consani, Simonides; Correr Sobrinho, Lourenço; Sinhoreti, Mario Alexandre Coelho; Sousa-Neto, Manoel D; Knowles, Jonathan C

2004-01-01

345

B.G. Thomas, "Continuous Casting", Yearbook of Science and Technology, McGraw-Hill, 2004. 1 Continuous Casting (metallurgy)  

E-print Network

for steel and other metals to minimize the amount of rolling required. Steel Continuous Casting. Recent innovations have transformed the continuous casting of steel into a sophisticated, high-technology process in the continuous casting process (Fig. 2). Molten steel freezes against the water-cooled walls of a bottomless

Thomas, Brian G.

346

Microstructure and Elemental Distribution in a Cast Austenitic Steel  

SciTech Connect

Casting of austenitic stainless steels offers the possibility of directly producing large and/or complex structures, such as the first wall shield module or the diverter cassette for the International Tokomak Experimental Reactor. However, the resulting mechanical properties and the corrosion resistance of such cast components can be inferior compared to conventionally forged components because of the larger grain size, lower dislocation density and extensive segregation inherent in the cast material. This study examines the microstructural and compositional heterogeneities of a large casting of 316N stainless steel, as well as the possibility of improving the homogeneity and mechanical properties of such a cast material.

Kenik, Edward A [ORNL; Busby, Jeremy T [ORNL; Hoelzer, David T [ORNL; Rowcliffe, Arthur Frederick [ORNL; Vitek, John Michael [ORNL

2007-01-01

347

Caste in 21st Century India: Competing Narratives  

PubMed Central

Recent debates regarding inclusion of caste in 2011 Census have raised questions about whether caste still matters in modern India. Ethnographic studies of the mid-20th century identified a variety of dimensions along which caste differentiation occurs. At the same time, whether this differentiation translates into hierarchy remains a contentious issue as does the persistence of caste, given the economic changes of the past two decades. Using data from a nationally representative survey of 41,554 households conducted in 2005, this paper examines the relationship between social background and different dimensions of well-being. The results suggest continued persistence of caste disparities in education, income and social networks. PMID:22736803

Desai, Sonalde; Dubey, Amaresh

2012-01-01

348

Porosities in a dental silver-palladium casting alloy.  

PubMed

Twelve single crowns were cast in a silver-palladium alloy by six different casting techniques. Polished sections of the crowns were inspected and photographically recorded by light microscopy. The area of the inspected section of the casting and the number and area of pores were recorded on the photographs by means of a digitizing table connected to a microcomputer. A great number of defects were observed unevenly distributed in all castings. Only small variations were observed between the various casting techniques. PMID:3893023

Oilo, G; Holland, R I; Johansen, O A

1985-03-01

349

[Application to dental casting machine of the rapid heating infrared image furnace (author's transl)].  

PubMed

The authors tried to manufacture a casting machine in dentistry by application of the infrared image furnace with a high heating speed and an easy control of a heating temperature. This machine melts an alloy in a carbon crucible set in the furnace, held in the horizontal position. Then, the furnace is turned to the vertical position to drop a melted alloy on the casting mold, and the alloy is cast in the mold by the pressure of Argon gas. The functions of trial casting machine were follows. 1. The trial casting machine was capable of heating to 1250 degrees C within one minute under 4 kW electric power. 2. The castability of the 20% Au-Pd-Ag commercial alloy cast in all casting conditions by the trial casting machine was higher than that of Thermotrol D-2 automatic centrifugal casting machine. 3. Castings of the trial casting machine showed higher tensile strength and elongation than those of the centrifugal casting machine, and the deviation of values got by the trial casting machine was small. In particular, some casting of the trial casting machine showed three times or over elongation values as compared with those of the centrifugal casting machine. 4. When casting conditions (casting temperature, casting pressure) of the trial casting machine changed, the physical properties of castings did not change so much. However, when the mold was not prevented from heating by the furnace in casting, the elongation of castings increased. PMID:7017037

Etchu, Y; Noguchi, H

1980-10-01

350

Mold and method for making variable thickness cast articles  

SciTech Connect

A method for casting molten metal articles of variable thickness in a mold is described, said method comprising the steps of: forming cavity walls within a permanent mold to define a casting cavity; lining portions of the cavity walls with sand to conform with the size and shape of corresponding sections of the article to be cast within the cavity; forming unlined bare portions of the cavity walls to conform with the size and shape of other corresponding sections of the article; varying the thickness of the sand to form thick and thin portions of the sand liner which are reversely correlated to corresponding thin and thick sections of the resultant cast article such that the sand liner is thicker in sections where the cast article is thin and is thinner in sections where the cast article is thicker; casting molten metal into the casting cavity causing the varied thickness sections to cool at different rates with the thinner sections cooling at a relatively slower rate than the thicker sections for producing an approximately equalized cooling time for these sections of the cast article; and characterized by controlling the temperature of the bore portions of the cavity walls during casting for precisely controlling the cooling rates and resultant physical properties of the sections of the cast article in contact with the bare portions.

Ruff, G.F.; Kuhn, J.W.; Wylie, R.J.

1993-05-25

351

Die Casting Part Distortion: Prediction and Attenuation  

SciTech Connect

The goal of this research was to predict the part deformation and residual stresses after ejection from the die and cooling to room temperature. A finite element model was built to achieve this goal and several modeling techniques were investigated throughout this research. Die-casting is a very complex process and the researchers are faced with a large number of hard to solve physical problems when modeling the process. Several assumptions are made in our simulation model. The first significant assumption is the instantaneous cavity filling. This means that the cavity filling stage is not considered in our model. Considering the cavity filling stage increases the modeling complexity as a result of different flow patterns. expected in the shot sleeve, gate, runner and different cavity features. The flow of gas from the cavity through the vents is another problem that is ignored in our model as a result of this assumption. Our second assumption is that the cast metal has uniform temperature distribution inside the cavity, at the starting point of simulation. This temperature is assumed to be over liquidus limit, i.e. the solid fraction is 0.0% of the cast metal. The third assumption is due to ABAQUS (commercial software used in this research) limitations. ABAQUS cannot deal with multi-phase models; therefore we use solid elements to define the casting instead of multi-phase (liquid/solid) elements. Liquid elements can carry the hydrostatic pressure from the shot sleeve and apply it on the cavity surfaces, while the solid elements do not have this capability. To compensate for this assumption we add the cavity pressure as a boundary condition and apply it on the cavity surface separately from the part. Another issue with this assumption is that, liquid casting can follow the cavity shape when it distorts. With the use of solid elements to represent the casting during its liquid state, it loses this capability to follow the cavity. Several techniques were tested to overcome this problem.

Dr, R. Allen Miller

2002-02-12

352

Metallic Fuel Casting Development and Parameter Optimization Simulations  

SciTech Connect

One of the advantages of metallic fuel is the abilility to cast the fuel slugs to near net shape with little additional processing. However, the high aspect ratio of the fuel is not ideal for casting. EBR-II fuel was cast using counter gravity injection casting (CGIC) but, concerns have been raised concerning the feasibility of this process for americium bearing alloys. The Fuel Cycle Research and Development program has begun developing gravity casting techniques suitable for fuel production. Compared to CGIC gravity casting does not require a large heel that then is recycled, does not require application of a vacuum during melting, and is conducive to re-usable molds. Development has included fabrication of two separate benchscale, approximately 300 grams, systems. To shorten development time computer simulations have been used to ensure mold and crucible designs are feasible and to identify which fluid properties most affect casting behavior and therefore require more characterization.

R.S. Fielding; J. Crapps; C. Unal; J.R. Kennedy

2013-03-01

353

An investigation of squeeze-cast alloy 718  

NASA Technical Reports Server (NTRS)

Alloy 718 billets produced by the squeeze-cast process have been evaluated for use as potential replacements for propulsion engine components which are normally produced from forgings. Alloy 718 billets were produced using various processing conditions. Structural characterizations were performed on 'as-cast' billets. As-cast billets were then homogenized and solution treated and aged according to conventional heat-treatment practices for this alloy. Mechanical property evaluations were performed on heat-treated billets. As-cast macrostructures and microstructures varied with squeeze-cast processing parameters. Mechanical properties varied with squeeze-cast processing parameters and heat treatments. One billet exhibited a defect free, refined microstructure, with mechanical properties approaching those of wrought alloy 718 bar, confirming the feasibility of squeeze-casting alloy 718. However, further process optimization is required, and further structural and mechanical property improvements are expected with process optimization.

Gamwell, W. R.

1993-01-01

354

Genetic Evidence on the Origins of Indian Caste Populations  

PubMed Central

The origins and affinities of the ?1 billion people living on the subcontinent of India have long been contested. This is owing, in part, to the many different waves of immigrants that have influenced the genetic structure of India. In the most recent of these waves, Indo-European-speaking people from West Eurasia entered India from the Northwest and diffused throughout the subcontinent. They purportedly admixed with or displaced indigenous Dravidic-speaking populations. Subsequently they may have established the Hindu caste system and placed themselves primarily in castes of higher rank. To explore the impact of West Eurasians on contemporary Indian caste populations, we compared mtDNA (400 bp of hypervariable region 1 and 14 restriction site polymorphisms) and Y-chromosome (20 biallelic polymorphisms and 5 short tandem repeats) variation in ?265 males from eight castes of different rank to ?750 Africans, Asians, Europeans, and other Indians. For maternally inherited mtDNA, each caste is most similar to Asians. However, 20%–30% of Indian mtDNA haplotypes belong to West Eurasian haplogroups, and the frequency of these haplotypes is proportional to caste rank, the highest frequency of West Eurasian haplotypes being found in the upper castes. In contrast, for paternally inherited Y-chromosome variation each caste is more similar to Europeans than to Asians. Moreover, the affinity to Europeans is proportionate to caste rank, the upper castes being most similar to Europeans, particularly East Europeans. These findings are consistent with greater West Eurasian male admixture with castes of higher rank. Nevertheless, the mitochondrial genome and the Y chromosome each represents only a single haploid locus and is more susceptible to large stochastic variation, bottlenecks, and selective sweeps. Thus, to increase the power of our analysis, we assayed 40 independent, biparentally inherited autosomal loci (1 LINE-1 and 39 Alu elements) in all of the caste and continental populations (?600 individuals). Analysis of these data demonstrated that the upper castes have a higher affinity to Europeans than to Asians, and the upper castes are significantly more similar to Europeans than are the lower castes. Collectively, all five datasets show a trend toward upper castes being more similar to Europeans, whereas lower castes are more similar to Asians. We conclude that Indian castes are most likely to be of proto-Asian origin with West Eurasian admixture resulting in rank-related and sex-specific differences in the genetic affinities of castes to Asians and Europeans. PMID:11381027

Bamshad, Michael; Kivisild, Toomas; Watkins, W. Scott; Dixon, Mary E.; Ricker, Chris E.; Rao, Baskara B.; Naidu, J. Mastan; Prasad, B.V. Ravi; Reddy, P. Govinda; Rasanayagam, Arani; Papiha, Surinder S.; Villems, Richard; Redd, Alan J.; Hammer, Michael F.; Nguyen, Son V.; Carroll, Marion L.; Batzer, Mark A.; Jorde, Lynn B.

2001-01-01

355

Volatile Species Retention During Metallic Fuel Casting  

SciTech Connect

Metallic nuclear fuels are candidate transmutation fuel forms for advanced fuel cycles. Through the operation of the Experimental Breeder Reactor II metallic nuclear fuels have been shown to be robust and easily manufactured. However, concerns have been raised concerning loss of americium during the casting process because of its high vapor pressure. In order to address these concerns a gaseous diffusion model was developed and a series of experiments using both manganese and samarium as surrogates for americium were conducted. The modeling results showed that volatility losses can be controlled to essentially no losses with a modest overpressure. Experimental results also showed volatile species retention down to no detectable losses through overpressure, although the loss values varied from the model results the same trend was seen. Bases on these results it is very probably that americium losses through volatility can be controlled to no detectable losses through application of a modest overpressure during casting.

Randall S. Fielding; Douglas L. Proter

2013-10-01

356

Volatile species retention during metallic fuel casting  

NASA Astrophysics Data System (ADS)

Metallic nuclear fuels are candidate transmutation fuel forms for advanced fuel cycles. Through the operation of the Experimental Breeder Reactor II metallic nuclear fuels have been shown to be robust and easily manufactured. However, concerns have been raised concerning loss of americium during the casting process because of its high vapor pressure. In order to address these concerns a gaseous diffusion model was developed and a series of experiments using both manganese and samarium as surrogates for americium were conducted. The modeling results showed that volatility losses can be controlled to essentially no losses with a modest overpressure. Experimental results also showed volatile species retention down to no detectable losses through overpressure, and although the loss values varied from the model results the same trend was seen. Based on these results it is very probable that americium losses through volatility can be controlled to no detectable losses through application of a modest overpressure during casting.

Fielding, Randall S.; Porter, Douglas L.

2013-10-01

357

The USAMP magnesium powertrain cast components project  

NASA Astrophysics Data System (ADS)

Despite the demonstrated ability of magnesium alloys to significantly reduce weight at acceptable costs in many areas of an automobile, powertrain components have not benefited from this metal, primarily because the high-temperature alloys that are required for engines and transmissions are too expensive. However, the U.S. Department of Energy and the U.S. Automotive Materials Partnership have launched a project to evaluate several new, potentially low-cost magnesium alloys, design several pre-competitive power-train components for the best alloy properties, cast and dynamometer or vehicle test the components in assembled powertrains, develop a powertrain magnesium alloy design database and common alloy specification, and identify andpromote the funding of fundamental research into improved magnesium alloys and casting processes.

Powell, Bob R.

2002-02-01

358

Solar axion search with the CAST experiment  

E-print Network

The CAST (CERN Axion Solar Telescope) experiment is searching for solar axions by their conversion into photons inside the magnet pipe of an LHC dipole. The analysis of the data recorded during the first phase of the experiment with vacuum in the magnet pipes has resulted in the most restrictive experimental limit on the coupling constant of axions to photons. In the second phase, CAST is operating with a buffer gas inside the magnet pipes in order to extent the sensitivity of the experiment to higher axion masses. We will present the first results on the $^{4}{\\rm He}$ data taking as well as the system upgrades that have been operated in the last year in order to adapt the experiment for the $^{3}{\\rm He}$ data taking. Expected sensitivities on the coupling constant of axions to photons will be given for the recent $^{3}{\\rm He}$ run just started in March 2008.

CAST Collaboration; E. Arik; S. Aune; D. Autiero; K. Barth; A. Belov; B. Beltrán; S. Borghi; F. S. Boydag; H. Bräuninger; G. Cantatore; J. M. Carmona; S. A. Cetin; J. I. Collar; T. Dafni; M. Davenport; L. Di Lella; O. B. Dogan; C. Eleftheriadis; N. Elias; G. Fanourakis; E. Ferrer-Ribas; H. Fischer; J. Franz; J. Galán; E. Gazis; T. Geralis; I. Giomataris; S. Gninenko; H. Gómez; M. Hasinoff; F. H. Heinsius; I. Hikmet; D. H. H. Hoffmann; I. G. Irastorza; J. Jacoby; K. Jakov?i?; D. Kang; T. Karageorgopoulou; M. Karuza; K. Königsmann; R. Kotthaus; M. Kr?mar; K. Kousouris; M. Kuster; B. Laki?; C. Lasseur; A. Liolios; A. Ljubi?i?; V. Lozza; G. Lutz; G. Luzón; D. Miller; J. Morales; T. Niinikoski; A. Nordt; A. Ortiz; T. Papaevangelou; M. J. Pivovaroff; A. Placci; G. Raiteri; G. Raffelt; H. Riege; A. Rodríguez; J. Ruz; I. Savvidis; Y. Semertzidis; P. Serpico; S. K. Solanki; R. Soufli; L. Stewart; M. Tsagri; K. van Bibber; J5D. Villar; J. Vogel; L. Walckiers; K. Zioutas

2008-10-10

359

Process for slip casting textured tubular structures  

DOEpatents

A process for centrifugal slip casting a textured hollow tube. A slip made up of a carrier fluid and a suspended powder is introduced into a porous mold which is rotated at a speed sufficient to create a centrifugal force that forces the slip radially outward toward the inner surface of the mold. The suspended powder, which is formed of particles having large dimensional aspect ratios such as particles of superconductive BSCCO, settles in a textured fashion radially outward toward the mold surface. The carrier fluid of the slip passes by capillary action radially outward around the settled particles and into the absorbent mold. A layer of mold release material is preferably centrifugally slip cast to cover the mold inner surface prior to the introduction of the BSCCO slip, and the mold release layer facilitates removal of the BSCCO greenbody from the mold without fracturing.

Steinlage, Greg A. (West Lafayette, IN); Trumble, Kevin P. (West Lafayette, IN); Bowman, Keith J. (West Lafayette, IN)

2002-01-01

360

Effect of casting/mould interfacial heat transfer during solidification of aluminium alloys cast in CO2-sand mould  

NASA Astrophysics Data System (ADS)

The ability of heat to flow across the casting and through the interface from the casting to the mold directly affects the evolution of solidification and plays a notable role in determining the freezing conditions within the casting, mainly in foundry systems of high thermal diffusivity such as chill castings. An experimental procedure has been utilized to measure the formation process of an interfacial gap and metal-mould interfacial movement during solidification of hollow cylindrical castings of Al-4.5 % Cu alloy cast in CO2-sand mould. Heat flow between the casting and the mould during solidification of Al-4.5 % Cu alloy in CO2-sand mould was assessed using an inverse modeling technique. The analysis yielded the interfacial heat flux ( q), heat transfer coefficient ( h) and the surface temperatures of the casting and the mould during solidification of the casting. The peak heat flux was incorporated as a dimensionless number and modeled as a function of the thermal diffusivities of the casting and the mould materials. Heat flux transients were normalized with respect to the peak heat flux and modeled as a function of time. The heat flux model proposed was to estimate the heat flux transients during solidification of Al-4.5 % Cu alloy cast in CO2-sand moulds.

Kulkarni, S. N.; Radhakrishna, D. K.

2011-06-01

361

Efficient Runner Networks for Investment Castings  

SciTech Connect

We present a computational method that finds an efficient runner network for an investment casting, once the gate locations have been established. The method seeks to minimize a cost function that is based on total network volume. The runner segments are restricted to lie in the space not occupied by the part itself. The collection of algorithms has been coded in C and runner designs have been computed for several real parts, demonstrating substantial reductions in rigging volume.

GIVLER,RICHARD C.; SAYLORS,DAVID B.

2000-07-18

362

Thin sheet casting with electromagnetic pressurization  

DOEpatents

An apparatus, method and system for the casting of thin strips or strips of metal upon a moving chill block that includes an electromagnet located so that molten metal poured from a reservoir onto the chill block passes into the magnetic field produced by the electromagnet. The electromagnet produces a force on the molten metal on said chill block in the direction toward said chill block in order to enhance thermal contact between the molten metal and the chill block.

Walk, Steven R. (Winterport, ME); Slepian, R. Michael (Pittsburgh, PA); Nathenson, Richard D. (Pittsburgh, PA); Williams, Robert S. (Fairfield, OH)

1991-01-01

363

Phase transformations in cast duplex stainless steels  

Microsoft Academic Search

Duplex stainless steels (DSS) constitute both ferrite and austenite as a matrix. Such a microstructure confers a high corrosion resistance with favorable mechanical properties. However, intermetallic phases such as sigma (sigma) and chi (chi) can also form during casting or high-temperature processing and can degrade the properties of the DSS. This research was initiated to develop time-temperature-transformation (TTT) and continuous-cooling-transformation

Yoon-Jun Kim

2004-01-01

364

Theoretical Model of Steel Continuous Casting Technology  

Microsoft Academic Search

A theoretical model adapted for studying steel continuous casting technology was proposed. The model based on system theory contained input\\/output, command, and control parameters. The process was divided into five stages, i. e., tundish, mold, guiding system, guiding-drawing system, and guiding-drawing-soft reduction system. The model can be used to describe the physicochemical processes, thermal processes, chemical processes, and characteristics of

C Gheorghies; I Crudu; C Teletin; C Spanu

2009-01-01

365

SILICA EXPOSURE IN HAND GRINDING STEEL CASTINGS  

Microsoft Academic Search

Exposure to silica dust was studied in the grinding of castings in a steel foundry that used conventional personal sampling methods and new real-time sampling techniques developed for the identification of high-exposure tasks and tools. Approximately one-third of the personal samples exceeded the National Institute for Occupational Safety and Health recommended exposure limit for crystalline silica, a fraction similar to

Dennis OBrien; Phillip A. Froehlich; Michael G. Gressel; Ronald M. Hall; Nancy J. Clark; Patrick Bost; Thomas Fischbach

1992-01-01

366

Internal adaptation of cast titanium crowns.  

PubMed

As the adaptation of titanium crowns obtained by Rematitan Plus investment, specific for titanium, is not recognized to be suitable, this study evaluated the effect of the concentration of the specific liquid and the temperature of the mold of investments on the internal misfit of crowns cast on commercially pure titanium. Individual dies of epoxy resin were obtained, representing teeth prepared for full-crown restoration with a 6-degree axial surface convergence angle and shoulder (1.0 mm). For the waxing of each crown, a ring-shaped stainless steel matrix (8.0mm internal diameter; 7.5 mm height) was adapted above the individual dies of epoxy resin. The Rematian Plus investment was mixed according to the manufacturer's instructions using two different concentrations of the specific liquid: 100%, 75%. Casting was performed in a Discovery Plasma Ar-arc vacuum-pressure casting machine with molds at temperatures of 430 degrees C, 515 degrees C and 600 degrees C. The crowns were cleaned individually in a solution (1% HF + 13% HNO3) for 10 min using a ultrasonic cleaner, with no internal adaptations, and luted with zinc phosphate cement under a 5 kg static load. The crown and die assemblies were embedded in resin and sectioned longitudinally. The area occupied by cement was observed using stereoscopic lens (10X) and measured by the Leica Qwin image analysis system (mm(2)). The data for each experimental condition (n=8) were analyzed by Kruskal-Wallis non-parametric test (á=0.05). The results showed that liquid dilution and the increase in mold temperature did not significantly influence the levels of internal fit of the cast titanium crowns. The lowest means (+/-SD) of internal misfit were obtained for the 430 degrees C/100%: (7.25 mm(2) +/-1.59) and 600 degrees C/100% (8.8 mm(2) +/-2.25) groups, which presented statistically similar levels of internal misfit. PMID:19089139

da Rocha, Sicknan Soares; Adabo, Gelson Luis; Ribeiro, Ricardo Faria; Fonseca, Renata Garcia

2007-08-01

367

Ultrasonics examination of cast stainless steel  

SciTech Connect

The ultrasonics examination of Cast Stainless Steel is for the NDE expert a particularly difficult challenge. In this paper recent results of a program between CEA and EDF are shown. These results include: (1) comparison for different transducers, in particularly large aperture composite transducer; (2) comparison for different signal processing techniques (Split Spectrum Processing), image processing; and (3) detection capabilities for artificial defect in different structures (equiaxed, colonnar structures).

Serre, M.; Benoist, P. [Commissariat a l`Energie Atomique, Saclay (France); Villard, D.; Demathan, N. [EDF, Renardieres (France)

1994-12-31

368

Microdistribution of magnesium in overinoculated cast iron  

Microsoft Academic Search

eter and 300 mm long that were heated to 700°C. The cast iron was subjected to metallographic, microprobe, and limited-area diffraction analysis. The metallographic analysis was conducted with the MIM-7 and MIM-8 microscopes and the microprobe analysis with the Cameca MS-46 microanalyzer. The microdiffraetion analysis was conducted with the UEMV-100K electron microscope. Electron fractographic analysis was also used; positive carbon

M. V. Mozharov; T. M. Smolyakova; A. M. Petrichenko; S. I. Serkhovets; S. B. Vukelich

1976-01-01

369

Repair welding of gamma titanium aluminide castings  

NASA Astrophysics Data System (ADS)

This paper examines the GTA repair welding of cast Ti-48Al-2Cr-2Nb gamma titanium aluminide. Pre-weld heat treatment, preheat and welding parameters are evaluated and discussed. A wide range of GTAW parameters is demonstrated for use with this alloy and the resulting weld structure is examined. The effects of postweld heat treatment on the structure of the weld deposit is also determined.

Kelly, T. J.

370

Repair welding of gamma titanium aluminide castings  

Microsoft Academic Search

This paper examines the GTA repair welding of cast Ti-48Al-2Cr-2Nb gamma titanium aluminide. Pre-weld heat treatment, preheat and welding parameters are evaluated and discussed. A wide range of GTAW parameters is demonstrated for use with this alloy and the resulting weld structure is examined. The effects of postweld heat treatment on the structure of the weld deposit is also determined.

T. J. Kelly

1992-01-01

371

CAST: An Inspiring Axion Helioscope ala Sikivie  

SciTech Connect

CAST is a data taking axion helioscope using a recycled LHC test magnet, CERN's detector technology and cryogenics expertise. An imaging X-ray telescope improves substantially the detection sensitivity and axion-ID. Massive axion-like particles of the Kaluza-Klein type were first introduced to explain the paradox of the hot corona, which is even hotter at locations overlying magnetic spots. This is suggesting that the CAST detection principle might be at work there, but being somehow modified and performing better. Remarkably, the density profile of the Sun allows for resonance crossing (m{sub axion}c{sup 2{approx_equal}}h{omega}{sub plasma}), which axion helioscopes are aiming to reach. The restless Sun favours this occasionally even further. Then, such processes can give rise to a chimera of converted axions or the like, making the Sun appear, within known physics, as mysterious and unpredictable as it is. CAST axion limits were used to conclude also for the hidden sector paraphotons. This is then suggestive for novel helioscopes for exotica like paraphotons, chameleons, etc. Pierre Sikivie's pioneering idea was to use a magnetic field as a catalyst to transform particles from the dark sector to ours, and vice versa.

Zioutas, K.; Anastassopoulos, V. [University of Patras, Patras (Greece); Tsagri, M. [University of Patras, Patras (Greece); CERN, 1211 Geneve 23 (Switzerland); Semertzidis, Y. [Brookhaven National Laboratory, Upton, NY (United States); Papaevangelou, T. [IRFU, Centre d'Etudes Nucleaires de Saclay, Gif-sur-Yvette (France)

2010-08-30

372

Casting riser design optimization using genetic algorithms  

SciTech Connect

The design of rigging systems for castings in the foundry is largely based on past experience and empirical rules. Recent literature shows that attempts are being made to adopt a more scientific approach towards rigging design (location and size of risers, proper orientation of the casting, determination of parting plane, etc.) through the use of rule-based expert systems, process simulation and other tools. Riser design is a key element in the optimization of the overall rigging system since riser designs with large safety margins reduce yield and increase cost. This paper describes a methodology to optimize the riser design. A genetic algorithm is used for simplicity as well as robustness. Values of selected riser design parameters are examined using a modulus based approach to optimize the riser yield while achieving functional performance (i.e. effectiveness of the riser to adequately feed regions where shrinkage-type defects have a tendency of forming). Since the optimization is carried out on the solid model of the riser, the resultant design of the riser, together with the casting can be directly sent to a rapid prototyping system for production of a pattern.

Guleyupoglu, S.; Upadhya, G.; Paul, A.J.; Yu, K.O. [Concurrent Technologies Corp., Johnstown, PA (United States); Hill, J.L. [Univ. of Alabama, Tuscaloosa, AL (United States). Engineering Science and Mechanics Dept.

1995-12-31

373

Aging degradation of cast stainless steel  

SciTech Connect

A program is being conducted to investigate the significance of in-service embrittlement of cast-duplex stainless steels under light-water reactor operating conditions. Data from room-temperature Charpy-impact tests for several heats of cast stainless steel aged up to 10,000 h at 350, 400, and 450/sup 0/C are presented and compared with results from other studies. Microstructures of cast-duplex stainless steels subjected to long-term aging either in the laboratory or in reactor service have been characterized. The results indicate that at least two processes contribute to the low-temperature embrittleent of duplex stainless steels, viz., weakening of the ferrite/austenite phase boundary by carbide precipitation and embrittlement of ferrite matrix by the formation of additional phases such as G-phase, Type X, or the ..cap alpha..' phase. Carbide precipitation has a significant effect on the onset of embrittlement of CF-8 and -8M grades of stainless steels aged at 400 or 450/sup 0/C. The existing correlations do not accurately represent the embrittlement behavior over the temperature range 300 to 450/sup 0/C. 18 refs., 13 figs.

Chopra, O.K.; Chung, H.M.

1985-10-01

374

Die Soldering in Aluminium Die Casting  

SciTech Connect

Two types of tests, dipping tests and dip-coating tests were carried out on small steel cylinders using pure aluminum and 380 alloy to investigate the mechanism of die soldering during aluminum die casting. Optical and scanning electron microscopy were used to study the morphology and composition of the phases formed during soldering. A soldering mechanism is postulated based on experimental observations. A soldering critical temperature is postulated at which iron begins to react with aluminum to form an aluminum-rich liquid phase and solid intermetallic compounds. When the temperature at the die surface is higher than this critical temperature, the aluminum-rich phase is liquid and joins the die with the casting during the subsequent solidification. The paper discusses the mechanism of soldering for the case of pure aluminum and 380 alloy casting in a steel mold, the factors that promote soldering, and the strength of the bond formed when soldering occurs. conditions, an aluminum-rich soldering layer may also form over the intermetallic layer. Although a significant amount of research has been conducted on the nature of these intermetallics, little is known about the conditions under which soldering occurs.

Han, Q.; Kenik, E.A.; Viswanathan, S.

2000-03-15

375

Symposium on electroslag component casting: proceedings  

SciTech Connect

The US Department of Energy (DOE), Office of Fossil Energy, Office of Surface Coal Gasification, has established a Materials Program to develop and apply appropriate materials to coal gasification plant components. The overall goals of the Surface Gasification Materials Program (SGMP) are to improve operational reliability and system durability and to reduce fabrication and operating costs of coal gasification plant components. The SGMP Electroslag Component Casting Project is directed to the development of electroslag casting (ESC) technology for use in coal conversion components such as valve bodies, pump housings, and pipe fittings. The aim is to develop a sufficient data base to permit ESC to become an ASME Code-accepted process. It is also intended to transfer the ESC process technology to private industry. This symposium was planned to discuss not only the SGMP Electroslag Component Casting Project but the activities and experiences of other organizations as well. The symposium addressed descriptions of electroslag processes; a worldwide perspective on the status of ESC technology; and details of production, mechanical properties, economics, and use of ESC for coal gasification components. Ten papers were presented, and a panel discussion was held to provide participants an opportunity to express their opinions and to offer recommendations on the content of the DOE program. This document constitutes the proceedings of that symposium. The papers included here are minimally edited transcripts of the presentations made at the symposium. All papers have been processed for inclusion in the Energy Data Base.

Judkins, R.R.; Hobday, J.M. (eds.)

1984-03-01

376

Seal welded cast iron nuclear waste container  

DOEpatents

This invention identifies methods and articles designed to circumvent metallurgical problems associated with hermetically closing an all cast iron nuclear waste package by welding. It involves welding nickel-carbon alloy inserts which are bonded to the mating plug and main body components of the package. The welding inserts might be bonded in place during casting of the package components. When the waste package closure weld is made, the most severe thermal effects of the process are restricted to the nickel-carbon insert material which is far better able to accommodate them than is cast iron. Use of nickel-carbon weld inserts should eliminate any need for pre-weld and post-weld heat treatments which are a problem to apply to nuclear waste packages. Although the waste package closure weld approach described results in a dissimilar metal combination, the relative surface area of nickel-to-iron, their electrochemical relationship, and the presence of graphite in both materials will act to prevent any galvanic corrosion problem.

Filippi, Arthur M. (Pittsburgh, PA); Sprecace, Richard P. (Murrysville, PA)

1987-01-01

377

Thin section casting program: Volume 4, Static cast product bending, straightening, and rolling: Final report  

SciTech Connect

Statically cast 1/2'', 3/4'', and 1'' thick steel slabs were subjected to hot rolling in a laboratory reversing mill and to simulated coiling-uncoiling on a three-point bender-unbender. Tensile properties and microstructures of hot bands thinner than 0.15'' produced from the statically cast slabs were found to be independent of initial slab thickness and similar to those from conventionally cast 8''-10'' thick slabs. Cold rolled and batch annealed product from the statically cast slabs had mechanical properties equivalent to those of conventionally processed deep-drawing quality steel. Overall, the results of this task indicated that 1/2''-1'' thick steel sections produced in a twin belt caster can be coiled and uncoiled in a hot coiler box downstream of the caster without generating any cracks in the product, and that the total range of hot and cold rolled sheet and strip products with qualities equivalent to those of conventionally produced can be obtained from the 1/2''-1'' thick sections. This report is the fifth of a six volume set on thin section casting.

Not Available

1989-01-01

378

Centrifugal Casting Features/Metallurgical Characterization of Aluminum Alloys  

SciTech Connect

This paper deals with the study of centrifugal effects on aluminium castings under high G values. Most of the studies in this domain (FGMs obtained by centrifugal casting) deal with functionally graded composites reinforced with a solid phase such as silicon particles or others. However, in this study it will be shown that unreinforced aluminium alloys may be significantly influenced by the centrifugal effect and that functionally graded castings are also obtained. It has been observed that the centrifugal effect may increase in some alloys, depending on the relative position in the castings, the rupture strength by approx. 50%, and rupture strain by about 300%, as compared to the gravity casting technique. The Young's modulus may also increase by about 20%. It has also been reported that in vertical centrifugal castings there are mainly three aspects that affect the components thus obtained, namely: fluid dynamics; vibration (inherent to the system); and centrifugal force. These features have a different effect on the castings depending on the aluminium alloy. In this paper, an analysis of the most important effects of the centrifugal casting process on metallurgical features is conducted. A solidification characterization at several points along the mould will be made in order to have an accurate idea of both the fluid dynamics inside the mould during the casting and the solidification behavior in different parts of the component. These two analyses will be related to the metallurgical properties (phase distribution; SDAS; eutectic silicon content and shape, pores density and shape) along the component and mainly along the direction of the centrifugal pressure. A comparison between castings obtained by both centrifugal casting technique and gravity casting technique is made for reference (gravity casting)

Chirita, G.; Soares, D.; Cruz, D.; Silva, F. S. [Mechanical Engineering Department, School of Engineering, Minho University (Portugal); Stefanescu, I. [Faculty of Mechanical Engineering, Dunarea de Jos University Galati (Romania)

2008-02-15

379

Hickey, W8009C, casts 10-14,14A Hickey, W8009C, casts 10-14,14A, page 1  

E-print Network

Hickey, W8009C, casts 10-14,14A Hickey, W8009C, casts 10-14,14A, page 1 #12;Hickey, W8009C, casts 10-14,14A Hickey, W8009C, casts 10-14,14A, page 2 #12;Hickey, W8009C, casts 10-14,14A Hickey, W8009C, casts 10-14,14A, page 3 #12;Hickey, W8009C, casts 10-14,14A Hickey, W8009C, casts 10-14,14A, page 4 #12

Hickey, Barbara

380

Effects of casting temperature on some properties of Co-Cr-Mo dental casting alloys.  

PubMed

The castability of three Co-Cr-Mo-C alloys, taken as the percentage of a grid pattern that was filled by metal, increased almost linearly from less than 10% to nearly 100% when the casting temperature was increased by 150 degrees C. The surface finish became poor only at the highest applied casting temperature (1635 degrees C). The ductility was significantly reduced by increasing the volume fraction of eutectic hard particles containing carbides. These particles cracked in a direction vertical to the stress in tensile tests, initiating a brittle failure. They also affected the work-hardening rate, and their volume fraction increased with the content of C and Cr. PMID:6397959

Herø, H

1984-12-01

381

Steel castings Ultrasonic examination, Part 2: Steel castings for highly stressed components  

E-print Network

This European Standard specifies the requirements for the ultrasonic examination of steel castings (with ferritic structure) for highly stressed components and the methods for determining internal discontinuities by the pulse echo technique. This European Standard applies to the ultrasonic examination of steel castings which have usually received a grain refining heat treatment and which have wall thicknesses up to and including 600 mm. For greater wall thicknesses, special agreements apply with respect to test procedure and recording levels. This European Standard does not apply to austenitic steels and joint welds.

International Organization for Standardization. Geneva

2004-01-01

382

Application of mold filling simulation to die casting processes  

SciTech Connect

Recently the authors find many reports on mold filling simulation and the related subjects. Using a general use computer code FLOW-3D, they research the practical application of mold filling simulation to die casting processes. The paper describes the result of this application. They compare the results of a water model experiment for die castings with that of the simulation. They determine the analysis conditions which cause the same flow patterns. To estimate the casting defects from the conditions, they compare the casting by a test die with that of the simulation. The application of the analysis model to a casting of air conditioner compressor proves practically useful by measuring amount of gases contained in the die castings.

Masuda, Eiji; Itoh, Isao; Haraguchi, Kenta [Honda Engineering Co., Ltd., Tochigi (Japan). Tochigi Research Center

1995-12-31

383

Fracture Toughness of CF8 Castings at Four Kelvin  

Microsoft Academic Search

The first fracture toughness measurements for CF8 stainless steel castings in liquid helium at 4 K are reported. Single-phase\\u000a (austenite) and duplex (austenite + ?-ferrite) castings were tested. On the basis of estimates from J-integral data, the plane-strain\\u000a fracture toughness (Klc) of castings containing 3.2 to 14.5 pct ?-ferrite ranged from 84 to 179 MPa · ml\\/2 at 4 K.

E. L. Brown; T. A. Whipple; R. L. Tobler

1983-01-01

384

Fracture Toughness of CF8 Castings at Four Kelvin  

Microsoft Academic Search

The first fracture toughness measurements for CF8 stainless steel castings in liquid helium at 4 K are reported. Single-phase (austenite) and duplex (austenite + delta-ferrite) castings were tested. On the basis of estimates from .J-integral data, the plane-strain fracture toughness (K lc) of castings containing 3.2 to 14.5 pct delta-ferrite ranged from 84 to 179 MPa · m1\\/2 at 4

E. L. Brown; T. A. Whipple; R. L. Tobler

1983-01-01

385

Feeding and risering of high-alloy steel castings  

Microsoft Academic Search

A more accurate, less conservative set of feeding distance (FD) and riser sizing rules is developed for high-alloy steel castings\\u000a produced from alloy grades CF-8M, CA-15, HH, HK, and HP. These rules are designed to produce radiographically sound castings\\u000a at 2 pct sensitivity. By comparing results between plate casting trials and the corresponding simulations of those trials,\\u000a a relationship is

Shouzhu Ou; Kent D. Carlson; Christoph Beckermann

2005-01-01

386

Application of cast gamma TiAl for automobiles  

Microsoft Academic Search

Studies of cast gamma TiAl applied for engine valves and turbocharger confirmed excellent performances. The durability of TiAl valves was also proven. Two cast gamma TiAl alloys were developed for the engine valves and the turbine wheels of turbochargers. New precision casting process of LEVICAST and induction brazing process of the gamma TiAl and alloy steels were proposed as advanced

T. Noda

1998-01-01

387

Effect of serial casting in spastic cerebral palsy  

Microsoft Academic Search

Objective  Cerebral palsy (CP) is a range of non progressive syndromes of posture and motor impairment due to an insult to developing\\u000a brain. Spasticity and incoordination are major causes of disability in these children which can be managed by different modalities\\u000a like casting, botulinum toxin, surgery etc. Cast application in spastic equinus is a well established procedure in CP but\\u000a cast

Shweta Jain; Navnendra Mathur; Mrinal Joshi; Rajeshwari Jindal; Sunil Goenka

2008-01-01

388

Investment cast AISI H13 tooling for automotive applications  

SciTech Connect

While many techniques exist for production of soft tooling, for die casting there is limited recent experience with cast tooling. The most common US alloy used for manufacture of die casting tooling is wrought AISI H13. If the performance of the cast material is comparable to the wrought counterpart, the use of investment cast HI 3 tooling directly from patterns made via rapid prototyping is of considerable interest. A metallurgical study of investment cast H13 was conducted to evaluate the mechanical behavior in simulated die casting applications. Variable thickness plate investment castings of AISI H13 hot work die steel were produced and characterized in the as-cast and heat-treated conditions. The characterization included light microscopy and mechanical testing. Wrought samples of standard and premium grade H13 were heat-treated and characterized similarly for comparison. Microstructural differences were observed in as-cast samples produced in different section thicknesses. Dendrite cell size and carbide morphology constituted the most prominent microstructural differences observed. After a full heat-treatment, microstructural differences between the wrought material and cast materials were slight regardless of section thickness.The mechanical properties of the cast and heat-treated material proved similar to the properties of the standard heat-treated wrought material. A thermal fatigue testing unit was to con-elate the heat checking susceptibility of H13 steel to its processing and consequent microstructural condition. Surface hardness decreased significantly with thermal cycling, and heat checking was observed in as few as 50 cycles. Thermal softening and thermal fatigue susceptibility were quantified and discussed relative to the microstructural conditions created by processing and heat-treatment. It was found that the premium grade wrought H13 steel provided the best overall resistance to heat checking.

Maguire, M.C.; Baldwin, M.D. [Sandia National Labs., Albuquerque, NM (United States); Hochanadel, P.W.; Edwards, G.R. [Colorado School of Mines, Golden, OH (United States)

1995-07-01

389

Segregation band formation in Al-Si die castings  

Microsoft Academic Search

Banded defects are often found in high-pressure die castings. These bands can contain segregation, porosity, and\\/or tears,\\u000a and changing casting conditions and alloy are known to change the position and make-up of the bands. Due to the complex, dynamic\\u000a nature of the high-pressure die-casting (HPDC) process, it is very difficult to study the effect of individual parameters\\u000a on band formation.

Christopher M. Gourlay; Arne K. Dahle; Hans I. Laukli

2004-01-01

390

Cast prosthesis removal using ultrasonics and a thermoplastic resin adhesive.  

PubMed

Nonsurgical endodontic procedures are routinely performed on teeth with existing cast restorations. The internal anatomy of the tooth and location of the root canals may be obscured by a crown or fixed partial denture. Tooth morphology and canal location may, therefore, be better visualized without the cast restoration in place. This article describes a conservative technique to remove an existing cast restoration to facilitate nonsurgical root canal treatment. PMID:7996088

Parreira, F R; O'Connor, R P; Hutter, J W

1994-03-01

391

Modeling the surface contamination of dental titanium investment castings  

Microsoft Academic Search

Objective: The objective of this study was to develop a computational tool for assisting the design of titanium dental castings with minimal defects and to compare computational simulations with casting experiments.Methods: Modeling. An in-house cellular-automata solidification and finite-difference diffusion program was coupled with a commercial casting program and applied to (a) simple geometric wedge models and (b) a 3D-laser scan

R. C. Atwood; P. D. Lee; R. V. Curtis

2005-01-01

392

3D printing technique applied to rapid casting  

Microsoft Academic Search

Purpose – The purpose of this paper is to verify the feasibility and evaluate the dimensional accuracy of two rapid casting (RC) solutions based on 3D printing technology: investment casting starting from 3D-printed starch patterns and the ZCast process for the production of cavities for light-alloys castings. Design\\/methodology\\/approach – Starting from the identification and design of a benchmark, technological prototypes

Elena Bassoli; Andrea Gatto; Luca Iuliano; Maria Grazia Violante

2007-01-01

393

The twin-roll casting of magnesium alloys  

NASA Astrophysics Data System (ADS)

Recently, technologies for twin-roll casting have been widely developed to efficiently fabricate the lightweight Mg alloy sheets that are quite attractive for numerous weight-sensitive applications. This paper reviews the recent progress in the twin-roll casting of Mg alloys, focusing on the processing aspects that have close relations to the solidification behavior of Mg alloy strips. In addition, recent attempts to develop new Mg alloys utilizing the metallurgical advantages attainable by this novel casting process are also presented.

Park, S. S.; Park, W.-J.; Kim, C. H.; You, B. S.; Kim, Nack J.

2009-08-01

394

Japanese R&D on new cast alloys and materials  

SciTech Connect

On the basis of observations of the JTEC team, it appears that Japanese universities and research institutes are leading long-term R&D thrusts for development of new materials casting technologies. Significant efforts include amorphous metals, intermetallics, application of MHD in continuous casting of steel, and energy efficient furnace technology. Industrial R&D seems focused more on process improvements than on new product technologies, but significant efforts in new cast materials included cast metal matrix composites, materials substitutions for thinner wall products, and advanced ceramic products for foundry industry applications.

Hayden, H.W.

1996-05-01

395

Evaluation of cast creep occurring during simulated clubfoot correction.  

PubMed

The Ponseti method is a widely accepted and highly successful conservative treatment of pediatric clubfoot involving weekly manipulations and cast applications. Qualitative assessments have indicated the potential success of the technique with cast materials other than standard plaster of Paris. However, guidelines for clubfoot correction based on the mechanical response of these materials have yet to be investigated. The current study sought to characterize and compare the ability of three standard cast materials to maintain the Ponseti-corrected foot position by evaluating cast creep response. A dynamic cast testing device, built to model clubfoot correction, was wrapped in plaster of Paris, semi-rigid fiberglass, and rigid fiberglass. Three-dimensional motion responses to two joint stiffnesses were recorded. Rotational creep displacement and linearity of the limb-cast composite were analyzed. Minimal change in position over time was found for all materials. Among cast materials, the rotational creep displacement was significantly different (p < 0.0001). The most creep displacement occurred in the plaster of Paris (2.0°), then the semi-rigid fiberglass (1.0°), and then the rigid fiberglass (0.4°). Torque magnitude did not affect creep displacement response. Analysis of normalized rotation showed quasi-linear viscoelastic behavior. This study provided a mechanical evaluation of cast material performance as used for clubfoot correction. Creep displacement dependence on cast material and insensitivity to torque were discovered. This information may provide a quantitative and mechanical basis for future innovations for clubfoot care. PMID:23636764

Cohen, Tamara L; Altiok, Haluk; Wang, Mei; McGrady, Linda M; Krzak, Joseph; Graf, Adam; Tarima, Sergey; Smith, Peter A; Harris, Gerald F

2013-08-01

396

Advanced precision expendable pattern casting technology. 1994 Summary report  

SciTech Connect

Casting technology is described. The following areas are reported on: precision pattern production; pattern coating; sand fill and compaction; pattern gating; mechanical properties; and technology transfer efforts.

NONE

1995-05-01

397

[Studies on application of pure titanium for cast plate].  

PubMed

Pure titanium produced by a commercial pure titanium casting system was studied for use as a cast plate for clinical application. The mechanical properties, elemental analysis, castability, adaptability of pure titanium and adhesion to denture base resin were investigated. The interfacial zone of the pure titanium castings was composed of a layered structure obtained by reaction with phosphate bonded Al2O3/SiO2 investment material. Vicher's hardness at 100 microns thick from the surface was higher than that in the inner part by oxidation. Cast pure titanium showed tensile strength, elongation and hardness close to those of the type III or IV dental gold alloy. The castability of pure titanium was lower than that of Co-Cr alloy and pure titanium castings also had large casting defects. Adaptability between pure titanium cast plate and the working model was satisfactory when reversible hydrocolloid impression material was used with heating-bath treatment in the refractory model. The tensile and compressive shear bonding strength of pure titanium to heat-curing or self-curing resin were similar to that of the Co-Cr alloy, and surface treatment using a solution containing 2-vol% 3-methacryloxypropyltrimethoxysilane produced a higher bonding strength than non-treatment, MKV treatment and 4-META treatment. These findings suggest that pure titanium castings produced by this system have suitable mechanical properties, adaptability and adhesion to denture base resin, and is available for cast plate in clinical application. PMID:2134765

Sakai, M

1990-06-01

398

A simplified method of total contact casting for diabetic foot ulcers.  

PubMed

A simplified method of total contact casting for diabetic plantar ulcerations is described in which a standard, well-molded short-leg walking cast is applied. Weekly cast changes are performed initially, followed by longer cast change intervals. Either fiberglass or plaster casting tape appears equally efficacious. Healing of all ulcers was demonstrated in 12 patients treated with this technique. PMID:10148327

Huband, M S; Carr, J B

1993-02-01

399

75 FR 20387 - Contech Castings, LLC, Including Workers Whose Unemployment Insurance (UI) Wages Are Reported...  

Federal Register 2010, 2011, 2012, 2013

...to workers of Contech Castings, LLC, including on-site...aluminum and magnesium die casted component parts...new company, Contech Casting LLC was formed. Some...aluminum and magnesium die casted component parts...All workers of Contech Castings, LLC, including...

2010-04-19

400

Aging degradation of cast stainless steel  

SciTech Connect

A program is being conducted to investigate the significance of in-service embrittlement of cast duplex stainless steels under light-water reactor operating conditions. Microstructures of cast materials subjected to long-term aging either in reactor service or in the laboratory have been characterized by TEM, SANS, and APFIM techniques. Two precipitate phases, i.e., the Cr-rich ..cap alpha..' and Ni- and Si-rich G phase, have been identified in the ferrite matrix of the aged steels. The results indicate that the low-temperature embrittlement is primarily caused by ..cap alpha..' precipitates which form by spinodal decomposition. The relative contribution of G phase to loss of toughness is now known. Microstructural data also indicate that weakening of ferrite/austenite phase boundary by carbide precipitates has a significant effect on the onset and extent of embrittlement of the high-carbon CF-8 and CF-8M grades of stainless steels, particularly after aging at 400 or 450/sup 0/C. Data from Charpy-impact, tensile, and J-R curve tests for several heats of cast stainless steel aged up to 10,000 h at 350, 400, and 450/sup 0/C are presented and correlated with the microstructural results. Thermal aging of the steels results in an increase in tensile strength and a decrease in impact energy, J/sub IC/, and tearing modulus. The fracture toughness results show good agreement with the Charpy-impact data. The effects of compositional and metallurgical variables on loss of toughness are discussed.

Chopra, O.K.; Chung, H.M.

1986-10-01

401

Initial solidification phenomena in continuous casting  

NASA Astrophysics Data System (ADS)

Continuous casting is the main process route for the mass production of steel today, yielding in excess of 560 million tons annually, corresponding to 80% of total steel production worldwide. As with any process, as improvements are introduced and quality is enhanced, there is the ever greater push to reduce problems that were once minor. The restrictions on quality for certain products require that defects be kept to a minimum. Currently, the industry has developed a wealth of experience in how to deal with slabs with oscillation marks. However, these practices are circumventions of the symptoms of the problems, not solutions for the causes. By understanding the formation mechanism, one can then develop practices based on a logical consideration oft he causes. The goals of this current work were to develop a mold simulator that could replicate the surface quality of industrial slabs. The techniques developed allowed for a more detailed examination of the heat transfer interactions during continuous casting, such that the variations of heat flux due to irregular solidification could be observed. It is shown that the mechanisms proposed in the literature are not individually sufficient for the formation of an oscillation mark, but several are necessary and must occur in concert for one to form. A mechanism is proposed for the formation of oscillation marks based upon the experimental results. This hypothesis is formulated as a series of necessary conditions that must be satisfied for an oscillation mark to be formed. This hypothesis is described, and shown to be in agreement with the trends observed and reported in the literature. It can explain both the overflow- and depression-type mark seen in industrial slabs. Additionally, this hypothesis was successfully used as a method of predicting the locations of oscillation marks on cast shells based upon the mold heat transfer measurements.

Badri, Adam

402

Tribological Properties of Al-SiC Metal Matrix Composites: A Comparison Between Sand Cast and Squeeze Cast Techniques  

NASA Astrophysics Data System (ADS)

Tribological behaviour of Al-SiC metal matrix composites prepared using two different fabrication techniques, viz. sand cast and squeeze cast techniques are studied in a multi- tribotester (TR-25, DUCOM, India) under dry sliding conditions and ambient atmosphere for varying volume fraction of reinforcement, applied load and sliding speed. Friction increases with increase in applied load and sliding speed and volume fraction of reinforcement. Wear test results show increased wear rates at higher load and speed, while increase in SiC volume fraction yields decrease in wear rate. Corrosion study conducted in 3.5 % NaCl solution shows that squeeze cast composites have better corrosion resistance than sand cast composites. Vickers's microhardness test shows improved hardness properties for squeeze cast composites compared to sand cast ones. The microstructure study of wear tracks reveals domination of abrasive wear with minor traces of adhesive wear.

Ghosh, S.; Sahoo, P.; Sutradhar, G.

2014-10-01

403

Method and apparatus for strip casting  

DOEpatents

Casting nozzles will provide improved flow conditions with the parameters controlled according to the present invention. The gap relationships between the nozzle slot and exit orifice must be controlled in combination with converging exit passageway to provide a smooth flow without shearing and turbulence in the stream. The nozzle lips are also rounded to improve flow and increase refractory life of the lips of the nozzle. The tundish walls are tapered to provide improve flow for supplying the melt to the nozzle. The nozzle is located about 45[degree] below top dead center for optimum conditions. 2 figures.

Follstaedt, D.W.; Powell, J.C.; Sussman, R.C.; Williams, R.S.

1991-11-12

404

Phase Transformations in Cast Duplex Stainless Steels  

SciTech Connect

Duplex stainless steels (DSS) constitute both ferrite and austenite as a matrix. Such a microstructure confers a high corrosion resistance with favorable mechanical properties. However, intermetallic phases such as {sigma} and {chi} can also form during casting or high-temperature processing and can degrade the properties of the DSS. This research was initiated to develop time-temperature-transformation (TTT) and continuous-cooling-transformation (CCT) diagrams of two types of cast duplex stainless steels, CD3MN (Fe-22Cr-5Ni-Mo-N) and CD3MWCuN (Fe-25Cr-7Ni-Mo-W-Cu-N), in order to understand the time and temperature ranges for intermetallic phase formation. The alloys were heat treated isothermally or under controlled cooling conditions and then characterized using conventional metallographic methods that included tint etching, and also using electron microscopy (SEM, TEM) and wavelength dispersive spectroscopy (WDS). The kinetics of intermetallic-phase ({sigma} + {chi}) formation were analyzed using the Johnson-Mehl-Avrami (MA) equation in the case of isothermal transformations and a modified form of this equation in the case of continuous cooling transformations. The rate of intermetallic-phase formation was found to be much faster in CD3MWCuN than CD3MN due mainly to differences in the major alloying contents such as Cr, Ni and Mo. To examine in more detail the effects of these elements of the phase stabilities; a series of eight steel castings was designed with the Cr, Ni and Mo contents systematically varied with respect to the nominal composition of CD3MN. The effects of varying the contents of alloying additions on the formation of intermetallic phases were also studied computationally using the commercial thermodynamic software package, Thermo-Calc. In general, {sigma} was stabilized with increasing Cr addition and {chi} by increasing Mo addition. However, a delicate balance among Ni and other minor elements such as N and Si also exists. Phase equilibria in DSS can be affected by local composition fluctuations in the cast alloy. This may cause discrepancy between thermodynamic prediction and experimental observation.

Yoon-Jun Kim

2004-12-19

405

Continuation of Crosscutting Technology Development at Cast  

SciTech Connect

This Final Technical Report describes progress made on the sub-projects awarded in the Cooperative Agreement DE-FC26-05NT42457: Continuation of Crosscutting Technology Development at Center for Advanced Separation Technologies (CAST). The final reports for each sub-project are attached in the appendix. Much of the research to be conducted with Cooperative Agreement funds will be longer-term, high-risk, basic research and will be carried out in five broad areas: a) Solid-solid separation b) Solid-liquid separation c) Chemical/Biological Extraction d) Modeling and Control, and e) Environmental Control.

Yoon, Roe-Hoan

2012-03-31

406

Phase transformations in cast duplex stainless steels  

NASA Astrophysics Data System (ADS)

Duplex stainless steels (DSS) constitute both ferrite and austenite as a matrix. Such a microstructure confers a high corrosion resistance with favorable mechanical properties. However, intermetallic phases such as sigma (sigma) and chi (chi) can also form during casting or high-temperature processing and can degrade the properties of the DSS. This research was initiated to develop time-temperature-transformation (TTT) and continuous-cooling-transformation (CCT) diagrams of two types of cast duplex stainless steels, CD3MN (Fe-22Cr-5Ni-Mo-N) and CD3MWCuN (Fe-25Cr-7Ni-Mo-W-Cu-N), in order to understand the time and temperature ranges for intermetallic phase formation. The alloys were heat treated isothermally or under controlled cooling conditions and then characterized using conventional metallographic methods that included tint etching, and also using electron microscopy (SEM, TEM) and wavelength dispersive spectroscopy (WDS). The kinetics of intermetallic-phase (sigma + chi) formation were analyzed using the Johnson-Mehl-Avrami (JMA) equation in the case of isothermal transformations and a modified form of this equation in the case of continuous cooling transformations. The rate of intermetallic-phase formation was found to be much faster in CD3MWCuN than CD3MN due mainly to differences in the major alloying contents such as Cr, Ni and Mo. To examine in more detail the effects of these elements of the phase stabilities, a series of eight steel castings was designed with the Cr, Ni and Mo contents systematically varied with respect to the nominal composition of CD3MN. The effects of varying the contents of alloying additions on the formation of intermetallic phases were also studied computationally using the commercial thermodynamic software package, Thermo-Calc. In general, a was stabilized with increasing Cr addition and chi by increasing Mo addition. However, a delicate balance among Ni and other minor elements such as N and Si also exists. Phase equilibria in DSS can be affected by local composition fluctuations in the cast alloy. This may cause discrepancy between thermodynamic prediction and experimental observation.

Kim, Yoon-Jun

407

Sputtered protective coatings for die casting dies  

SciTech Connect

This investigation determined whether selected ion beam sputtered coatings on H-13 die steel would have the potential of improving the thermal fatigue behavior of the steel used as a die in aluminum die casting. The coatings were selected to test candidate insulators and metals capable of providing protection of the die surface. The studies indicate that 1 micrometer thick W and Pt coatings reduced the thermal fatigue more than any other coating tested and are candidates to be used on a die surface to increase die life.

Mirtich, M.J.; Nieh, C.Y.

1981-01-01

408

Reconciling the CAST and PVLAS Results  

E-print Network

The PVLAS experiment has recently claimed evidence for an axion-like particle in the milli-electron-Volt mass range with a coupling to two photons that appears to be in contradiction with the negative results of the CAST experiment searching for solar axions. The simple axion interpretation of these two experimental results is therefore untenable and it has posed a challenge for theory. We propose a possible way to reconcile these two results by postulating the existence of an ultralight pseudo-scalar particle interacting with two photons and a scalar boson and the existence of a low scale phase transition in the theory.

R. N. Mohapatra; Salah Nasri

2006-10-05

409

Indications and limitations of splints and casts.  

PubMed

Long bone fractures are relatively common in cattle, whether they result from a self-inflicted trauma or from external actors (herd mate or farm machinery). Various advanced orthopedic techniques have been described to stabilize and treat fractures in cattle with success. Unfortunately the use of most of those techniques remains unrealistic in a field setting, rendering the realization of splints and casts still accurate for the treatment of long bone fracture in cattle. This article refers to the use of all external coaptation and their specific indications as well as their limitations. PMID:24534659

Mulon, Pierre-Yves; Desrochers, André

2014-03-01

410

Optimal cooling strategies in continuous casting of steel with variable casting speed  

Microsoft Academic Search

In the “soft-reduction” zone of a continuous casting machine, the strand thickness is reduced slightly by compression to minimize center segregation which would decrease the steel quality. In order to successfully apply this technology, one has to ensure that final solidification takes place within the soft-reduction zone. This can be done by controlling solidification with cooling water sprayed onto the

Wilhelm Grever; Andreas Binder; Heinz W. Engl; Karl Mörwald

1996-01-01

411

Thin section casting program. Volume 3: Vertical TSC (Thin-Section Casting) approach  

NASA Astrophysics Data System (ADS)

A prototype vertical twin belt caster was designed, constructed and tested at Bethlehem Steel Corporation's Homer Research Laboratory for the development of a thin section casting process. In the prototype caster, the moving mold was aligned vertically and each of the two endless steel belts was tensioned around an upper and a lower large pulley by means of a third smaller pulley. The mold consisted of a long parallel lower section and a shorter V-shaped top section into which liquid steel was fed from a tundish via a submerged refractory nozzle. Mold length, defined as the distance from the meniscus in the V-mouth to the tangent point of the lower pulleys, was about eleven feet. The length of the V-mouth was 27 in. The belts were continuously supported between the upper and lower pulleys by a unique back-up system. Downstream support consisted of two pairs of foot rolls and a vertical water-cooled steel structure that would permit a cast length of about nineteen feet. A chain driven bar was used to start a cast and support the slab. The aim was to cast 1 in. by 17 in. sections at 250 in./min. The details of the prototype vertical caster, except the end walls, are given.

1989-01-01

412

Comparative study of two commercially pure titanium casting methods  

PubMed Central

The interest in using titanium to fabricate removable partial denture (RPD) frameworks has increased, but there are few studies evaluating the effects of casting methods on clasp behavior. Objective This study compared the occurrence of porosities and the retentive force of commercially pure titanium (CP Ti) and cobalt-chromium (Co-Cr) removable partial denture circumferential clasps cast by induction/centrifugation and plasma/vacuum-pressure. Material and Methods 72 frameworks were cast from CP Ti (n=36) and Co-Cr alloy (n=36; control group). For each material, 18 frameworks were casted by electromagnetic induction and injected by centrifugation, whereas the other 18 were casted by plasma and injected by vacuum-pressure. For each casting method, three subgroups (n=6) were formed: 0.25 mm, 0.50 mm, and 0.75 mm undercuts. The specimens were radiographed and subjected to an insertion/removal test simulating 5 years of framework use. Data were analyzed by ANOVA and Tukey's to compare materials and cast methods (?=0.05). Results Three of 18 specimens of the induction/centrifugation group and 9 of 18 specimens of plasma/vacuum-pressure cast presented porosities, but only 1 and 7 specimens, respectively, were rejected for simulation test. For Co-Cr alloy, no defects were found. Comparing the casting methods, statistically significant differences (p<0.05) were observed only for the Co-Cr alloy with 0.25 mm and 0.50 mm undercuts. Significant differences were found for the 0.25 mm and 0.75 mm undercuts dependent on the material used. For the 0.50 mm undercut, significant differences were found when the materials were induction casted. Conclusion Although both casting methods produced satisfactory CP Ti RPD frameworks, the occurrence of porosities was greater in the plasma/vacuum-pressure than in the induction/centrifugation method, the latter resulting in higher clasp rigidity, generating higher retention force values. PMID:21085805

RODRIGUES, Renata Cristina Silveira; FARIA, Adriana Claudia Lapria; ORSI, Iara Augusta; de MATTOS, Maria da Gloria Chiarello; MACEDO, Ana Paula; RIBEIRO, Ricardo Faria

2010-01-01

413

Spall behavior of cast iron with varying microstructures  

NASA Astrophysics Data System (ADS)

The spall strength of cast iron with varying microstructures has been investigated using plate impact at moderate speed. Stress history measurements were made with manganin stress gauges embedded between the back face of the specimen and a low impedance polycarbonate backing. Five separate cast irons were tested. Four of these consisted of gray cast iron with graphite in flake form, with three classified as Type VII A2 and the fourth containing a bimodal distribution of Types VII A4 and VII D8. The fifth casting consisted of ductile cast iron with graphite in nodular form, classified as Type I, size class 5. The spall strength for the Type VII A2 gray cast irons varied between 40 and 370 MPa, and that of the additional gray cast iron, between 410 and 490 MPa. The spall strength of the ductile cast iron fell within the range of 0.94-1.2 GPa. It is shown that the spall strength is linked to the damage level at the spall plane, where an increased level of tensile stress is required to generate higher levels of damage. Post mortem analysis was performed on the recovered samples, revealing the graphite phase to be the primary factor governing the spall fracture of cast irons, where crack nucleation is directly correlated to the debonding of graphite from the metal matrix. The average length of graphite found within a casting is linked to the material's strength, where strength increases as a function of decreasing length. The morphology and mean free path of graphite precipitates further govern the subsequent coalescence of initiated cracks to form a complete fracture plane. In cases where graphite spacing is large, increased energy level is required to complete the fracture process. A secondary factor governing the spall fracture of cast irons has also been linked to the microstructure of the metal matrix, with pearlite yielding higher spall strengths than free ferrite.

Plume, Gifford; Rousseau, Carl-Ernst

2014-07-01

414

Aluminum Alloy and Article Cast Therefrom  

NASA Technical Reports Server (NTRS)

A cast article from an aluminum alloy, which has improved mechanical properties at elevated temperatures, has the following composition in weight percent: Silicon 14 - 25.0, Copper 5.5 - 8.0, Iron 0.05 - 1.2, Magnesium 0.5 - 1.5, Nickel 0.05 - 0.9, Manganese 0.05 - 1.0, Titanium 0.05 - 1.2, Zirconium 0.05 - 1.2, Vanadium 0.05 - 1.2, Zinc 0.05 - 0.9, Phosphorus 0.001 - 0.1, and the balance is Aluminum, wherein the silicon-to-magnesium ratio is 10 - 25, and the copper-to-magnesium ratio is 4 - 15. The aluminum alloy contains a simultaneous dispersion of three types of Al3X compound particles (X=Ti, V, Zr) having a LI2, crystal structure, and their lattice parameters are coherent to the aluminum matrix lattice. A process for producing this cast article is also disclosed, as well as a metal matrix composite, which includes the aluminum alloy serving as a matrix and containing up to about 60% by volume of a secondary filler material.

Lee, Jonathan A. (Inventor); Chen, Po-Shou (Inventor)

2003-01-01

415

Advanced Lost Foam Casting Technology - Phase V  

SciTech Connect

Previous research, conducted under DOE Contracts DE-FC07-89ID12869, DE-FC07-93ID12230 and DE-FC07-95ID113358 made significant advances in understanding the Lost Foam Casting (LFC) Process and clearly identified areas where additional developments were needed to improve the process and make it more functional in industrial environments. The current project focused on eight tasks listed as follows: Task 1--Computational Model for the Process and Data Base to Support the Model; Task 2--Casting Dimensional Accuracy; Task 3--Pattern Production; Task 4--Improved Pattern Materials; Task 5--Coating Control; Task 6--In-Plant Case Studies; Task 7--Energy and the Environmental Data; and Task 8--Technology Transfer. This report summarizes the work done on all tasks in the period of October 1, 1999 through September 30, 2004. The results obtained in each task and subtask are summarized in this Executive Summary and details are provided in subsequent sections of the report.

Wanliang Sun; Harry E. Littleton; Charles E. Bates

2004-04-29

416

Software Computes Tape-Casting Parameters  

NASA Technical Reports Server (NTRS)

Tcast2 is a FORTRAN computer program that accelerates the setup of a process in which a slurry containing metal particles and a polymeric binder is cast, to a thickness regulated by a doctor blade, onto fibers wound on a rotating drum to make a green precursor of a metal-matrix/fiber composite tape. Before Tcast2, setup parameters were determined by trial and error in time-consuming multiple iterations of the process. In Tcast2, the fiber architecture in the final composite is expressed in terms of the lateral distance between fibers and the thickness-wise distance between fibers in adjacent plies. The lateral distance is controlled via the manner of winding. The interply spacing is controlled via the characteristics of the slurry and the doctor-blade height. When a new combination of fibers and slurry is first cast and dried to a green tape, the shrinkage from the wet to the green condition and a few other key parameters of the green tape are measured. These parameters are provided as input to Tcast2, which uses them to compute the doctor-blade height and fiber spacings needed to obtain the desired fiber architecture and fiber volume fraction in the final composite.

deGroh, Henry C., III

2003-01-01

417

ASM Handbook, Volume 15, Casting, Division 4: Modeling and Analysis of Casting Processes, American Society of Metals (2008) 449-461  

E-print Network

ASM Handbook, Volume 15, Casting, Division 4: Modeling and Analysis of Casting Processes, American the quality of the final product that is desired by the casting industry. Accurate calculation of displacements, strains, and stresses during the casting process is needed to predict residual stress

Paris-Sud XI, Université de

418

75 FR 54596 - Final Results of Expedited Sunset Review: Heavy Iron Construction Castings from Brazil  

Federal Register 2010, 2011, 2012, 2013

...of Expedited Sunset Review: Heavy Iron Construction Castings from...duty order (``CVD'') on heavy iron construction castings from...CVD order consists of certain heavy iron construction castings from...purposes for public utility, water and sanitary systems. The...

2010-09-08

419

40 CFR 466.20 - Applicability; description of the cast iron basis material subcategory.  

Code of Federal Regulations, 2010 CFR

...Applicability; description of the cast iron basis material subcategory. 466.20 Section...ENAMELING POINT SOURCE CATEGORY Cast Iron Basis Material Subcategory § 466.20 Applicability; description of the cast iron basis material subcategory. This...

2010-07-01

420

40 CFR 721.10667 - Slimes and sludges, aluminum and iron casting, wastewater treatment, solid waste.  

Code of Federal Regulations, 2013 CFR

...sludges, aluminum and iron casting, wastewater treatment, solid waste. 721.10667...sludges, aluminum and iron casting, wastewater treatment, solid waste. (a) Chemical...sludges, aluminum and iron casting, wastewater treatment, solid waste...

2013-07-01

421

76 FR 5840 - The Basic Aluminum Castings Co., Cleveland, OH; Notice of Revised Determination on Reconsideration  

Federal Register 2010, 2011, 2012, 2013

...related to the production of aluminum die castings. New information revealed that...or directly competitive aluminum die castings produced by the subject firm have...regarding their purchases of aluminum die castings during the relevant period....

2011-02-02

422

75 FR 49945 - Iron Construction Castings From Brazil, Canada, and China  

Federal Register 2010, 2011, 2012, 2013

...Review)] Iron Construction Castings From Brazil, Canada, and China AGENCY: United States...orders on iron construction castings from Brazil, Canada, and China...orders on iron construction castings from Brazil, Canada, and China would likely...

2010-08-16

423

75 FR 23295 - Iron Construction Castings From Brazil, Canada, and China  

Federal Register 2010, 2011, 2012, 2013

...concerning iron construction castings from...light'' iron construction castings. (4) The Domestic Industry is the U.S...found two Domestic Industries: (1) all domestic...heavy'' iron construction castings...

2010-05-03

424

21 CFR 888.5980 - Manual cast application and removal instrument.  

Code of Federal Regulations, 2010 CFR

...2010-04-01 2010-04-01 false Manual cast application and removal instrument...Surgical Devices § 888.5980 Manual cast application and removal instrument. (a) Identification. A manual cast application and removal...

2010-04-01

425

21 CFR 888.5980 - Manual cast application and removal instrument.  

Code of Federal Regulations, 2013 CFR

...2013-04-01 2013-04-01 false Manual cast application and removal instrument...Surgical Devices § 888.5980 Manual cast application and removal instrument. (a) Identification. A manual cast application and removal...

2013-04-01

426

40 CFR 466.20 - Applicability; description of the cast iron basis material subcategory.  

Code of Federal Regulations, 2011 CFR

...false Applicability; description of the cast iron basis material subcategory. 466...PORCELAIN ENAMELING POINT SOURCE CATEGORY Cast Iron Basis Material Subcategory § 466.20 Applicability; description of the cast iron basis material subcategory....

2011-07-01

427

40 CFR 466.20 - Applicability; description of the cast iron basis material subcategory.  

Code of Federal Regulations, 2013 CFR

...false Applicability; description of the cast iron basis material subcategory. 466...PORCELAIN ENAMELING POINT SOURCE CATEGORY Cast Iron Basis Material Subcategory § 466.20 Applicability; description of the cast iron basis material subcategory....

2013-07-01

428

76 FR 27668 - Algonac Cast Products, Inc., Algonac, MI; Notice of Revised Determination on Reconsideration  

Federal Register 2010, 2011, 2012, 2013

...Administration [TA-W-74,549] Algonac Cast Products, Inc., Algonac, MI; Notice...the workers and former workers of Algonac Cast Products, Inc., Algonac, Michigan...sales/production declines at Algonac Cast Products, Inc., Algonac,...

2011-05-12

429

40 CFR 466.20 - Applicability; description of the cast iron basis material subcategory.  

Code of Federal Regulations, 2012 CFR

...false Applicability; description of the cast iron basis material subcategory. 466...PORCELAIN ENAMELING POINT SOURCE CATEGORY Cast Iron Basis Material Subcategory § 466.20 Applicability; description of the cast iron basis material subcategory....

2012-07-01

430

49 CFR 192.369 - Service lines: Connections to cast iron or ductile iron mains.  

Code of Federal Regulations, 2010 CFR

...false Service lines: Connections to cast iron or ductile iron mains. 192.369...369 Service lines: Connections to cast iron or ductile iron mains. (a) Each service line connected to a cast iron or ductile iron main must be...

2010-10-01

431

Genetic caste determination in Pogonomyrmex harvester ants imposes costs during colony founding  

E-print Network

Genetic caste determination in Pogonomyrmex harvester ants imposes costs during colony founding T with marked morphological differences between the queen and worker castes. These differences usually result). However, genetically determined caste differentiation has been recently discovered in two populations

Alvarez, Nadir

432

21 CFR 888.5980 - Manual cast application and removal instrument.  

Code of Federal Regulations, 2012 CFR

...2012-04-01 2012-04-01 false Manual cast application and removal instrument...Surgical Devices § 888.5980 Manual cast application and removal instrument. (a) Identification. A manual cast application and removal...

2012-04-01

433

49 CFR 192.489 - Remedial measures: Cast iron and ductile iron pipelines.  

Code of Federal Regulations, 2013 CFR

...2013-10-01 false Remedial measures: Cast iron and ductile iron pipelines. 192...Control § 192.489 Remedial measures: Cast iron and ductile iron pipelines. (a) General graphitization. Each segment of cast iron or ductile iron pipe on which...

2013-10-01

434

49 CFR 192.489 - Remedial measures: Cast iron and ductile iron pipelines.  

Code of Federal Regulations, 2011 CFR

...2011-10-01 false Remedial measures: Cast iron and ductile iron pipelines. 192...Control § 192.489 Remedial measures: Cast iron and ductile iron pipelines. (a) General graphitization. Each segment of cast iron or ductile iron pipe on which...

2011-10-01

435

21 CFR 888.5980 - Manual cast application and removal instrument.  

...2014-04-01 2014-04-01 false Manual cast application and removal instrument...Surgical Devices § 888.5980 Manual cast application and removal instrument. (a) Identification. A manual cast application and removal...

2014-04-01

436

49 CFR 192.369 - Service lines: Connections to cast iron or ductile iron mains.  

Code of Federal Regulations, 2012 CFR

...false Service lines: Connections to cast iron or ductile iron mains. 192.369...369 Service lines: Connections to cast iron or ductile iron mains. (a) Each service line connected to a cast iron or ductile iron main must be...

2012-10-01

437

21 CFR 888.5980 - Manual cast application and removal instrument.  

Code of Federal Regulations, 2011 CFR

...2011-04-01 2011-04-01 false Manual cast application and removal instrument...Surgical Devices § 888.5980 Manual cast application and removal instrument. (a) Identification. A manual cast application and removal...

2011-04-01

438

49 CFR 192.369 - Service lines: Connections to cast iron or ductile iron mains.  

Code of Federal Regulations, 2011 CFR

...false Service lines: Connections to cast iron or ductile iron mains. 192.369...369 Service lines: Connections to cast iron or ductile iron mains. (a) Each service line connected to a cast iron or ductile iron main must be...

2011-10-01

439

49 CFR 192.489 - Remedial measures: Cast iron and ductile iron pipelines.  

Code of Federal Regulations, 2010 CFR

...2010-10-01 false Remedial measures: Cast iron and ductile iron pipelines. 192...Control § 192.489 Remedial measures: Cast iron and ductile iron pipelines. (a) General graphitization. Each segment of cast iron or ductile iron pipe on which...

2010-10-01

440

49 CFR 192.489 - Remedial measures: Cast iron and ductile iron pipelines.  

Code of Federal Regulations, 2012 CFR

...2012-10-01 false Remedial measures: Cast iron and ductile iron pipelines. 192...Control § 192.489 Remedial measures: Cast iron and ductile iron pipelines. (a) General graphitization. Each segment of cast iron or ductile iron pipe on which...

2012-10-01

441

49 CFR 192.369 - Service lines: Connections to cast iron or ductile iron mains.  

Code of Federal Regulations, 2013 CFR

...false Service lines: Connections to cast iron or ductile iron mains. 192.369...369 Service lines: Connections to cast iron or ductile iron mains. (a) Each service line connected to a cast iron or ductile iron main must be...

2013-10-01

442

Hickey-W8305A_casts31-39 Hickey-W8305A_casts31-39,page1  

E-print Network

Hickey-W8305A_casts31-39 Hickey-W8305A_casts31-39,page1 #12;Hickey-W8305A_casts31-39 Hickey-W8305A_casts31-39,page2 #12;Hickey-W8305A_casts31-39 Hickey-W8305A_casts31-39,page3 #12;Hickey-W8305A_casts31-39 Hickey-W8305A_casts31-39,page4 #12;Hickey-W8305A_casts31-39 Hickey-W8305A_casts31-39,page5 #12;Hickey

Hickey, Barbara

443

Hickey-W8305A,casts21-30 Hickey-W8305A,casts21-30,page1  

E-print Network

Hickey-W8305A,casts21-30 Hickey-W8305A,casts21-30,page1 #12;Hickey-W8305A,casts21-30 Hickey-W8305A,casts21-30,page2 #12;Hickey-W8305A,casts21-30 Hickey-W8305A,casts21-30,page3 #12;Hickey-W8305A,casts21-30 Hickey-W8305A,casts21-30,page4 #12;Hickey-W8305A,casts21-30 Hickey-W8305A,casts21-30,page5 #12;Hickey

Hickey, Barbara

444

The structures of fully eutectic aluminium-silicon alloy castings  

Microsoft Academic Search

Strontium-modified aluminium alloys containing 14 to 15 wt% silicon were cast with fully eutectic structures by using heated moulds and high-purity materials. In alloys containing the additional elements magnesium, copper or nickel, a distinct eutectic colony structure was evident outlined by intermetallic compounds. At the edges of the castings the eutectic colony structures and the aluminium grains (revealed by anodizing)

T. B. Abbott; B. A. Parker

1990-01-01

445

DIVISON 03 CONCRETE 03300 CAST-IN-PLACE CONCRETE  

E-print Network

DIVISON 03 ­ CONCRETE _____________________________________________________________ 03300 CAST-IN-PLACE CONCRETE A. Design Considerations 1. Testing and inspection will be required for cast-in-place concrete of the Building Code. All testing and inspection of concrete work will be contracted for and paid for directly

446

RAW COPPER SLABS USED IN CASTING OPERATIONS AT BUFFALO PLANT ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

RAW COPPER SLABS USED IN CASTING OPERATIONS AT BUFFALO PLANT OF AMERICAN BRASS COMPANY. MATERIALS STORAGE FOR THE CAST SHOP NOW OCCUPIES A PORTION OF THE ORIGINAL BRASS MILL BUILT BY THE BUFFALO COPPER AND BRASS ROLLING MILL IN 1906-07 AND EXPANDED IN 1911. - American Brass Foundry, 70 Sayre Street, Buffalo, Erie County, NY

447

MicroCast: Cooperative Video Streaming on Smartphones Lorenzo Keller  

E-print Network

MicroCast: Cooperative Video Streaming on Smartphones Lorenzo Keller School of I&C EPFL, Lausanne, applications on smartphones today. In this paper, we con- sider a group of smartphone users, within proximityCast, that uses the resources on all smartphones of the group in a co- operative way so as to improve

Markopoulou, Athina

448

Technical properties of slips for hot casting under pressure  

Microsoft Academic Search

The use of the thermoplastic method for manufacturing small articles of borosilicate glass for the frames of semiconductor devices has necessitated an investigation of the properties of the casting slip. Casting slip consists of a suspension of finely milled glass powder and organic bond. This article gives the results of an investigation of the effect of dispersion of the powder,

V. G. Bezborodov

1968-01-01

449

Thermal stresses in aluminium alloy die casting dies  

Microsoft Academic Search

The aim of this research is to analyze the influence of Aluminium Alloy die casting parameters, die material, and die geometry on in-service tool life. An innovative immersion testing apparatus is developed, at which Aluminium Alloy die casting is simulated. It enables controlled thermal fatigue cycling. Special specimens with different edge geometry and specimens with maraging steel welds deposited by

Damjan Klob?ar; Janez Tušek

2008-01-01

450

My shadow, myself: cast-body shadows are embodied.  

PubMed

Objects that serve as extensions of the body can produce a sensation of embodiment, feeling as if they are a part of us. We investigated the characteristics that drive an object's embodiment, examining whether cast-body shadows, a purely visual stimulus, are embodied. Tools are represented as an extension of the body when they enable observers to interact with distant targets, perceptually distorting space. We examined whether perceptual distortion would also result from exposure to cast-body shadows in two separate distance estimation perceptual matching tasks. If observers represent cast-body shadows as extensions of their bodies, then when these shadows extend toward a target, it should appear closer than when no shadow is present (Experiment 1). This effect should not occur when a non-cast-body shadow is cast toward a target (Experiment 2). We found perceptual distortions in both cast-body shadow and tool-use conditions, but not in our non-cast-body shadow condition. These results suggest that, although cast-body shadows do not enable interaction with objects or provide direct tactile feedback, observers nonetheless represent their shadows as if they were a part of them. PMID:24243137

Kuylen, Christopher; Balas, Benjamin; Thomas, Laura E

2014-06-01

451

A new model for caste development in social wasps.  

PubMed

Specialization into reproductive and non-reproductive castes is one of the defining traits of eusocial insects. Knowledge of the proximal causes of caste differentiation is therefore central to achieving an understanding of the evolution of eusociality. Castes are an example of a polyphenism, multiple, discrete phenotypes arising from a single genotype in response to differing environmental conditions. Here we focus on recent work in the social wasps to provide insight into how environmental conditions may trigger the development of caste across a range from independent- to swarm-founding social species. The amount of food larvae receive has long been recognized as a key input factor in the determination of caste, but that alone is insufficient to account for the range of combinations of size, development time and caste among the female offspring of Polistes, an independent-founding wasp. Recent experimental work on P. fuscatus has shown that vibrations that are associated with the feeding of larvae are another essential environmental input in the determination of caste. we present a model of how vibrational signaling in the context of feeding larvae could interact with nutritional input to account for the developmental patterns seen in these wasps. Mapping the distribution of vibrational signaling onto a phylogeny of the social wasps suggests that this trait characterized the common ancestor of the subfamilies vespinae + Polistinae, diversified in the independent-founding species, then was superseded by caste-determining mechanisms in the swarm-founding and vespine species that function more effectively in larger colonies. PMID:21966550

Jeanne, Robert L; Suryanarayanan, Sainath

2011-07-01

452

3D THICKNESS MEASUREMENT TECHNIQUE FOR CONTINUOUS CASTING BREAKOUT SHELLS  

E-print Network

3D THICKNESS MEASUREMENT TECHNIQUE FOR CONTINUOUS CASTING BREAKOUT SHELLS Begoña Santillana1 European Continuous-Casting Conference, 2011, MetTec InSteelCon, (Dusseldorf, Germany, June 27- July 1 following a breakout have been accurately measured using a laser scanner and the variations in shell

Thomas, Brian G.

453

43. DETAIL OF TOP OF CAST IRON GATE TO FRIERSON ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

43. DETAIL OF TOP OF CAST IRON GATE TO FRIERSON AND VAUGHAN CEMETERY PLOT, SHOWING YEAR OF CONSTRUCTION (1860) AND DETAILS OF CASTINGS HABS SC, 43-STATBU. V, 1A-4 - Church of the Holy Cross, State Route 261, Stateburg, Sumter County, SC

454

Rapid Tooling via Investment Casting and Rapid Prototype Patterns  

SciTech Connect

The objective of this work to develop the materials processing and design technologies required to reduce the die development time for metal mold processes from 12 months to 3 months, using die casting of Al and Mg as the example process. Sandia demonstrated that investment casting, using rapid prototype patterns produced from Stereo lithography or Selective laser Sintering, was a viable alternative/supplement to the current technology of machining form wrought stock. A demonstration die insert (ejector halt) was investment cast and subsequently tested in the die casting environment. The stationary half of the die insert was machined from wrought material to benchmark the cast half. The two inserts were run in a die casting machine for 3,100 shots of aluminum and at the end of the run no visible difference could be detected between the cast and machined inserts. Inspection concluded that the cast insert performed identically to the machined insert. Both inserts had no indications of heat checking or degradation.

Baldwin, Michael D.

1999-06-01

455

Steel, Cast Iron and Concrete: Security Engineering for  

E-print Network

Steel, Cast Iron and Concrete: Security Engineering for Real World Wireless Sensor Networks Frank.): ACNS 2008, LNCS 5037, pp. 460­478, 2008. c Springer-Verlag Berlin Heidelberg 2008 #12;Steel, Cast Iron of the main steel cables of a suspension bridge or the middle section of a 3 km stretch of subway tunnel

Cambridge, University of

456

Control design and implementation in continuous steel casting  

Microsoft Academic Search

Accurate control of the mold level in continuous casting is believed to be a key factor in improving the quality of the cast product. This paper describes an application of advanced control to this problem leading to a complete recommissioning of the mold level control system. Careful physical modeling identified smooth as well as nonsmooth nonlinearities in the process. Three

S. F. Graebe; G. C. Goodwin; G. Elsley

1995-01-01

457

Automatic 3D modeling of palatal plaster casts Marco Andreetto  

E-print Network

duplicated by 3D printers. A second application where 3D models of palatal casts could also be usefulAutomatic 3D modeling of palatal plaster casts Marco Andreetto Dept. of Information Engineer corte@dei.unipd.it Abstract This work introduces a procedure for automatic 3D model- ing and discusses

Abu-Mostafa, Yaser S.

458

Vacuum assisted high pressure die casting of aluminium alloys  

Microsoft Academic Search

High pressure die castings usually contain gas porosity due mainly to the entrapment of air or gas in the melt during the very high speed injection of the molten metal into the cavity. In this paper, the advantages of using an evacuated die cavity during mould filling were evaluated. ASTM standard die casting tensile specimens of three Al alloys, Al–5%Si,

X. P. Niu; B. H. Hu; I. Pinwill; H. Li

2000-01-01

459

Copper die-cast rotor efficiency improvement and economic consideration  

Microsoft Academic Search

Significant motor efficiency improvement can be achieved by substituting aluminum with copper die-cast rotor in a squirrel cage induction motor. This paper summarizes the experiments conducted by Westinghouse Motor Company Canada Ltd. in our copper die-cast rotor induction motors project

SIAN LIE; CARLO DI PIETRO

1995-01-01

460

Die-cast copper rotors for improved motor performance  

Microsoft Academic Search

Aluminum has been the common conductor material for the squirrel cage of the induction motor largely because of ease of manufacturing by pressure die casting. Short die life in die casting the higher melting copper resulting in high production cost has prevented the copper rotor from attaining a place in integral horsepower motors. Because of its higher electrical conductivity, copper

John G. Cowie; D. T. Brender

2003-01-01

461

A quick esthetic remount cast for all-ceramic restorations.  

PubMed

A technique is presented for the expedited fabrication of a remount cast for the alteration of all-ceramic crowns and fixed partial dentures. The remount cast allows the laboratory technician to know the precise location of the gingival tissues and allows modification of all-ceramic restorations. PMID:20456029

Hansen, Paul A; Gist, Julie

2010-08-01

462

FRICTION AND WEAR MODEL FOR POLYMER AND CAST IRON COUPLE  

Microsoft Academic Search

The sliding contact deformation of plastic material with cast iron will be appreciated as a plastically. It is analysed the friction and wear for two plastic material in contact with sliding cast iron conical cutter. It is defined a theoretical friction and wear model by used Challen-Oxley and Yang-Torrance models. The new model is experimental deformation, hardness and strength of

Ivona Petre; Andrei Tudor

463

8. VIEW OF A MOLD FOR PRECISION CASTING. THE MOLD ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

8. VIEW OF A MOLD FOR PRECISION CASTING. THE MOLD WAS USED IN FOUNDRY OPERATIONS THAT CAST PLUTONIUM EITHER AS INGOTS SUITABLE FOR ROLLING AND FURTHER WROUGHT PROCESSING OR INTO SHAPES AMENABLE TO DIRECT MACHINING OPERATIONS. (5/6/59) - Rocky Flats Plant, Plutonium Fabrication, Central section of Plant, Golden, Jefferson County, CO

464

Squeeze casting of light alloys and their composites  

Microsoft Academic Search

Squeeze casting is the term used commonly to describe processes in which liquid metal is solidified under the action of a relatively high external pressure. The fundamentals of the process have been known for decades, the process having been used in Russia for more than 50 years. However, it is only recently that squeeze casting has been commercialised in the

T. M. Yue; G. A. Chadwick

1996-01-01

465

Investigation of sub-surface cracks in continuous cast billets  

Microsoft Academic Search

Sub-surface cracks in the continuous cast product of steel were studied to understand the causes of such defects and to suggest remedial measures. Even after hot rolling the cracks were not welded. The diameter of the as cast billets were 225 mm and most of the cracks were located around l cm away from the edges. The cracks were visible

G. Das; Sukomal Ghosh; S. Ghosh Chowdhury; Sabita Ghosh; Swapan Das; D. K. Bhattacharaya

2003-01-01

466

Using EShP to obtain cast electroslag forging billets  

Microsoft Academic Search

The results of experimental industrial tests show convincingly that the use of cast electroslag die billets makes it possible to increase the strength of the die attachment, manufactured from the most modern high strength brands of steels 1.5 to 2 times, under operating conditions on highly productive presses and on the most recent automatic presses. Extensive introduction of cast electroslag

G. A. Boyko; V. S. Grinyuk; V. M. Shneyberg; N. A. Tsvetkov

1974-01-01

467

EFFECT OF MELTING TECHNIQUES ON DUCTILE IRON CASTINGS PROPERTIES  

Microsoft Academic Search

The study was designed to investigate the effects of the charge, melting conditions, nodularizing and inocula- tion on the ductile iron castings properties. Results showed that the temperature and holding time of the melt in an induction furnace and the intensity of spheroidizing effect on the carbon and residual magnesium contents in the ductile iron castings. The same grade of

S. BOCKUS; A. DOBROVOLSKIS

2006-01-01

468

Casting Porosity-Free Grain Refined Magnesium Alloys  

SciTech Connect

The objective of this project was to identify the root causes for micro-porosity in magnesium alloy castings and recommend remedies that can be implemented in production. The findings confirm the key role played by utilizing optimal gating and risering practices in minimizing porosity in magnesium castings.?

Schwam, David [Case Western Reserve University] [Case Western Reserve University

2013-08-12

469

Button versus buttonless castings for removable partial denture frameworks.  

PubMed

Casting removable partial dentures (RPDs) without completely filling the sprue channels and generating casting buttons would result in saving metal and making more defect-free castings. This investigation tested whether a complete and sound RPD casting can be obtained when a minimal amount of metal is used. A factorial experimental design, three spruing methods, two metal feeding directions, and two different weights of metal were used to cast 60 Kennedy class II, modification 1 RPDs. The metal used to cast each framework was either enough to result in a full button or in no button. Visual and radiographic examinations and counting of defects were made by two independent operators who were unaware of the spruing method, feeding direction, or amount of metal used to make the framework. The completeness of the casting and the presence of porosities were evaluated for clasps, major connectors, and meshworks. The use of minimal metal to cast RPDs was equally as successful as using enough for a full button, provided that the appropriate spruing arrangement and metal feeding direction were chosen. Indirect metal feeding for maxillary RPDs was successful with the proper spruing arrangement. PMID:7990051

Mohammed, H; Hassaballa, M A; Talic, Y F

1994-10-01

470

Gold jewellery casting: Technology design and defects elimination  

Microsoft Academic Search

Investment casting is widely used in the production of gold jewellery. In contrast to the state of other metal casting industry, however, their technological characteristics such as gating, melting and pouring are given little consideration. In this article, the technological characteristics of 18K (carat) gold alloys have been studied and are discussed. Some defects such as shrinkage porosity, gas porosity,

X. J. Zhang; K. K. Tong; R. Chan; M. Tan

1995-01-01

471

Tribological behavior of coatings for continuous casting of steel  

Microsoft Academic Search

There are a large number of steel making processes in which great demands are made on the surface behavior of several components that come into direct contact with steel under various conditions. Continuous casting is mainly a heat-extraction process. The mold must rapidly transfer heat from the steel to the cooling water. In continuous casting, steel solidification starts when it

Alejandro Sanz

2001-01-01

472

The Childhood Asperger Syndrome Test (Cast): Test--Retest Reliability  

ERIC Educational Resources Information Center

The Childhood Asperger Syndrome Test (CAST) is a 37-item parental self-completion questionnaire to screen for autism spectrum conditions in research. Good test accuracy was demonstrated in studies with primary school aged children in mainstream schools. The aim of this study was to investigate the test-retest reliability of the CAST. Parents of…

Williams, Jo; Allison, Carrie; Scott, Fiona; Stott, Carol; Bolton, Patrick; Baron-Cohen, Simon; Brayne, Carol

2006-01-01

473

AERIAL VIEW OF MC WANE CAST IRON PIPE, LOOKING WEST ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

AERIAL VIEW OF MC WANE CAST IRON PIPE, LOOKING WEST TO BIRMINGHAM CITY CENTER. I-20-59 RUNNING DIAGONALLY FROM RIGHT MIDDLE GROUND. L&N RAILROAD TRACKS IN FOREGROUND. - McWane Cast Iron Pipe, 1201 Vanderbilt Road , Birmingham, Jefferson County, AL

474

21. GENERAL INTERIOR VIEW OF CARRIE No. 3 CAST HOUSE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

21. GENERAL INTERIOR VIEW OF CARRIE No. 3 CAST HOUSE SHOWING BUSTLE PIPE AND TUYERES OF FURNACE No. 3. THE DOUBLE TRUSSING OF THE CAST HOUSE ROOF IS ALSO VISIBLE. - U.S. Steel Homestead Works, Blast Furnace Plant, Along Monongahela River, Homestead, Allegheny County, PA

475

LUNG MODEL CASTING TECHNIQUES FOR INTERSPECIES MORPHOMETRIC COMPARISONS  

EPA Science Inventory

Techniques have been developed for casting both solid and hollow lung models from lung specimens. These techniques have been used to make casts of rat, rabbit, baboon, and human lungs and may be used for other species. An air line at a positive pressure of 25 cm of water is conne...

476

A method for signature casting on digital images  

Microsoft Academic Search

Signature (watermark) casting on digital images is an important problem, since it affects many aspects of the information market. We propose a method for casting digital watermarks on images and we analyze its effectiveness. The satisfaction of some basic demands in this area is examined and a method for producing digital watermarks is proposed. Moreover, immunity to subsampling is examined

I. Pitas

1996-01-01

477

The Childhood Autism Spectrum Test (CAST): Sex Differences  

ERIC Educational Resources Information Center

The Childhood Autism Spectrum Test (CAST) (formally known as the Childhood Asperger Screening Test) identifies autism spectrum conditions by measuring social and communication skills. The present study explored the sex distribution of scores. The CAST was distributed to 11,635 children aged 4-9 years in Cambridgeshire primary schools (UK). 3,370…

Williams, Joanna G.; Allison, Carrie; Scott, Fiona J.; Bolton, Patrick F.; Baron-Cohen, Simon; Matthews, Fiona E.; Brayne, Carol

2008-01-01

478

GUIDES TO POLLUTION PREVENTION: METAL CASTING AND HEAT TREATING INDUSTRY  

EPA Science Inventory

This guide provides an overview of the major waste generating process of metal casting and heat treating operations and presents options for reducing this waste through source reduction and recycling. ost waste generated by the metal casting, or foundry, industry is from melting ...

479

126. EXTERIOR VIEW, LOOKING NORTH, SHOWING CAST SHED NO. 2, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

126. EXTERIOR VIEW, LOOKING NORTH, SHOWING CAST SHED NO. 2, FURNACE NO. 2, STOVES, POWER HOUSE, STACKS, FURNACE NO. 1 CAST SHED. FURNACE NO. 2 IS IN PROCESS OF RESTORATION. - Sloss-Sheffield Steel & Iron, First Avenue North Viaduct at Thirty-second Street, Birmingham, Jefferson County, AL

480

Energy Saving Melting andRevert Reduction Technology (E0SMARRT): Predicting Pattern Tooling and Casting Dimension for Investment Casting  

SciTech Connect

The investment casting process is an expendable mold process where wax patterns of the part and rigging are molded, assembled, shelled and melted to produce a ceramic mold matching the shape of the component to be cast. Investment casting is an important manufacturing method for critical parts because of the ability to maintain dimensional shape and tolerances. However, these tolerances can be easily exceeded if the molding components do not maintain their individual shapes well. In the investment casting process there are several opportunities for the final casting shape to not maintain the intended size and shape, such as shrinkage of the wax in the injection tool, the modification of the shape during shell heating, and with the thermal shrink and distortion in the casting process. Studies have been completed to look at the casting and shell distortions through the process in earlier phases of this project. Dr. Adrian Sabau at Oak Ridge National Labs performed characterizations and validations of 17-4 PH stainless steel in primarily fused silica shell systems with good agreement between analysis results and experimental data. Further tasks provided material property measurements of wax and methodology for employing a viscoelastic definition of wax materials into software. The final set of tasks involved the implementation of the findings into the commercial casting analysis software ProCAST, owned and maintained by ESI Group. This included: o the transfer of the wax material property data from its raw form into separate temperature-dependent thermophysical and mechanical property datasets o adding this wax material property data into an easily viewable and modifiable user interface within the pre-processing application of the ProCAST suite, namely PreCAST o and validating the data and viscoelastic wax model with respect to experimental results

Nick Cannell; Dr. Mark Samonds; Adi Sholapurwalla; Sam Scott

2008-11-21

481

SCAN DEPTH TEMP Hickey, TT162, Casts 8-16, page 1 CTD008  

E-print Network

SCAN DEPTH TEMP Hickey, TT162, Casts 8-16, page 1 CTD008 #12;Hickey, TT162, Casts 8-16, page 2 CTD008 #12;Hickey, TT162, Casts 8-16, page 3 CTD008 #12;Hickey, TT162, Casts 8-16, page 4 CTD009 #12;Hickey, TT162, Casts 8-16, page 5 CTD009 #12;Hickey, TT162, Casts 8-16, page 6 CTD010 #12;Hickey, TT162

Hickey, Barbara

482

Grain Refinement of Permanent Mold Cast Copper Base Alloys  

SciTech Connect

Grain refinement is a well established process for many cast and wrought alloys. The mechanical properties of various alloys could be enhanced by reducing the grain size. Refinement is also known to improve casting characteristics such as fluidity and hot tearing. Grain refinement of copper-base alloys is not widely used, especially in sand casting process. However, in permanent mold casting of copper alloys it is now common to use grain refinement to counteract the problem of severe hot tearing which also improves the pressure tightness of plumbing components. The mechanism of grain refinement in copper-base alloys is not well understood. The issues to be studied include the effect of minor alloy additions on the microstructure, their interaction with the grain refiner, effect of cooling rate, and loss of grain refinement (fading). In this investigation, efforts were made to explore and understand grain refinement of copper alloys, especially in permanent mold casting conditions.

M.Sadayappan; J.P.Thomson; M.Elboujdaini; G.Ping Gu; M. Sahoo

2005-04-01

483

Waterproof versus cotton cast liners: a randomized, prospective comparison.  

PubMed

Casting injured extremities can cause complications (eg, itching, odor, rashes, skin maceration), many of which are associated with the inability to wash the extremity because of water retention and slow drying of conventional cast liners. A waterproof cast liner allows casts to become wet and perhaps improves hygiene and comfort. Fifty-nine patients (age, > or = 10 years) with upper or lower extremity injuries were randomized to a waterproof-liner group (n = 29) or a cotton-liner group (n = 30). Both groups had casts made of fiberglass tape. At each clinic visit, patients and physicians completed questionnaires evaluating comfort and skin condition, respectively. The waterproof-liner group had better scores for itch (P = .008), discomfort (P < .001), irritation (P = .002), overall patient score (P = .012), and overall physician score (P = .049). PMID:16610379

Haley, Chad A; DeJong, E Schuyler; Ward, John A; Kragh, John F

2006-03-01

484

Prediction of ALLOY SHRINKAGE FACTORS FOR THE INVESTMENT CASTING PROCESS  

SciTech Connect

This study deals with the experimental measurements and numerical predictions of alloy shrinkage factors (SFs) related to the investment casting process. The dimensions of the A356 aluminum alloy casting were determined from the numerical simulation results of solidification, heat transfer, fluid dynamics, and deformation phenomena. The investment casting process was carried out using wax patterns of unfilled wax and shell molds that were made of fused silica with a zircon prime coat. The dimensions of the die tooling, wax pattern, and casting were measured, in order to determine the actual tooling allowances. Several numerical simulations were carried out, to assess the level of accuracy for the casting shrinkage. The solid fraction threshold, at which the transition from the fluid dynamics to the solid dynamics occurs, was found to be important in predicting shrinkage factors (SFs). It was found that accurate predictions were obtained for all measued dimensions when the shell mold was considered a deformable material.

Sabau, Adrian S [ORNL

2006-01-01

485

Method and apparatus for planar drag strip casting  

DOEpatents

The present invention is directed to an improved process and apparatus for strip casting. The combination of a planar flow casting nozzle positioned back from the top dead center position with an attached nozzle extension, provides an increased level of casting control and quality. The nozzle extension provides a means of containing the molten pool above the rotating substrate to increase the control of molten metal at the edges of the strip and increase the range of coating thicknesses which may be produced. The level of molten metal in the containment means is regulated to be above the level of melt supplying the casting nozzle which produces a condition of planar drag flow with the casting substrate prior to solidification. 5 figures.

Powell, J.C.; Campbell, S.L.

1991-11-12

486

Method and apparatus for planar drag strip casting  

DOEpatents

The present invention is directed to an improved process and apparatus for strip casting. The combination of a planar flow casting nozzle positioned back from the top dead center position with an attached nozzle extension, provides an increased level of casting control and quality. The nozzle extension provides a means of containing the molten pool above the rotating substrate to increase the control of molten metal at the edges of the strip and increase the range of coating thicknesses which may be produced. The level of molten metal in the containment means is regulated to be above the level of melt supplying the casting nozzle which produces a condition of planar drag flow with the casting substrate prior to solidification.

Powell, John C. (Pittsburgh, PA); Campbell, Steven L. (Middletown, OH)

1991-01-01

487

The Influence of Casting Conditions on the Microstructure of As-Cast U-10Mo Alloys: Characterization of the Casting Process Baseline  

SciTech Connect

Sections of eight plate castings of uranium alloyed with 10 wt% molybdenum (U-10Mo) were sent from Y-12 to the Pacific Northwest National Laboratory (PNNL) for microstructural characterization. This report summarizes the results from this study.

Nyberg, Eric A.; Joshi, Vineet V.; Lavender, Curt A.; Paxton, Dean M.; Burkes, Douglas

2013-12-13

488

Relationship Between Casting Distortion, Mold Filling, and Interfacial Heat Transfer in Sand Molds  

SciTech Connect

This project sought to determine the relationship between casting dimensions and interfacial heat transfer in aluminum alloy sand castings. The program had four parts; measurement of interfacial heat transfer coefficients in resin bonded and green sand molds, the measurement of gap formation in these molds, the analysis of castings made in varying gatings, orientations and thicknesses, and the measurement of residual stresses in castings in the as-cast and gate removed condition. New values for interfacial heat transfer coefficients were measured, a novel method for gap formation was developed, and the variation of casting dimensions with casting method, gating, and casting orientation in the mold was documented.

J. K. Parker; K. A. Woodbury; T. S. Piwonka; Y. Owusu

1999-09-30

489

Mathematical and physical modeling of systems for metal delivery in the continuous casting of steel and DC casting of aluminum  

Microsoft Academic Search

In the continuous casting of steel, various nozzles have been used (e.g., bifurcated nozzles with ports inclined at various angles to the horizontal) to deliver metal from the tundish into the caster. An even greater variety of devices is used in the case of semi-continuous (direct chill (DC) or electromagnetic (EM)) casting of aluminum, for example, nozzles delivering metal into

D Xu; W. K Jones Jr; J. W Evans; D. P Cook

1998-01-01

490

Casting defects and fatigue strength of a die cast aluminium alloy: a comparison between standard specimens and production components  

Microsoft Academic Search

The influence of casting defects on static and fatigue strength is investigated for a high pressure die cast aluminium alloy. Defects exist in gas and shrinkage pores as well as cold fills, dross and alumina skins. For the three batches of specimens, differing for the sprue–runner design, the influence was straightforward, while no significant variation in the fatigue strength was

M. Avalle; G. Belingardi; M. P. Cavatorta; R. Doglione

2002-01-01

491

Casting inorganic structures with DNA molds.  

PubMed

We report a general strategy for designing and synthesizing inorganic nanostructures with arbitrarily prescribed three-dimensional shapes. Computationally designed DNA strands self-assemble into a stiff "nanomold" that contains a user-specified three-dimensional cavity and encloses a nucleating gold "seed." Under mild conditions, this seed grows into a larger cast structure that fills and thus replicates the cavity. We synthesized a variety of nanoparticles with 3-nanometer resolution: three distinct silver cuboids with three independently tunable dimensions, silver and gold nanoparticles with diverse cross sections, and composite structures with homo- and heterogeneous components. The designer equilateral silver triangular and spherical nanoparticles exhibited plasmonic properties consistent with electromagnetism-based simulations. Our framework is generalizable to more complex geometries and diverse inorganic materials, offering a range of applications in biosensing, photonics, and nanoelectronics. PMID:25301973

Sun, Wei; Boulais, Etienne; Hakobyan, Yera; Wang, Wei Li; Guan, Amy; Bathe, Mark; Yin, Peng

2014-11-01

492

Fractal structures in casting films from chlorophyll  

NASA Astrophysics Data System (ADS)

Chlorophyll (Chl) molecules are important because they can act as natural light-harvesting devices during the photosynthesis. In addition, they have potential for application as component of solar cell. In this work, we have prepared casting films from chlorophyll (Chl) and demonstrated the occurrence of fractal structures when the films were submitted to different concentrations. By using optical microscopy and the box-count method, we have found that the fractal dimension is Df = 1.55. This value is close to predicted by the diffusion-limited aggregation (DLA) model. This suggests that the major mechanism - which determines the growth of the fractal structures from Chl molecules - is the molecular diffusion. Since the efficiencies of solar cells depend on the morphology of their interfaces, these finds can be useful to improve this kind of device.

Pedro, G. C.; Gorza, F. D. S.; de Souza, N. C.; Silva, J. R.

2014-04-01

493

FInal Report - Investment Casting Shell Cracking  

SciTech Connect

This project made a significant contribution to the understanding of the investment casting shell cracking problem. The effects of wax properties on the occurrence of shell cracking were demonstrated and can be measured. The properties measured include coefficient of thermal expansion, heating rate and crystallinity of the structure. The important features of production molds and materials properties have been indicated by case study analysis and fractography of low strength test bars. It was found that stress risers in shell cavity design were important and that typical critical flaws were either oversize particles or large pores just behind the prime coat. It was also found that the true effect of fugitive polymer fibers was not permeability increase, but rather a toughening mechanism due to crack deflection.

Von Richards

2003-12-01

494

TiC reinforced cast Cr steels  

SciTech Connect

A new class of materials, namely TiC-reinforced cast chromium (Cr) steels, was developed for applications requiring high abrasion resistance and good fracture toughness. The research approach was to modify the carbide structure of commercial AISI 440C steel for better fracture resistance while maintaining the already high abrasion resistance. The new alloys contained 12Cr, 2.5–4.5Ti, and 1–1.5C (wt.%) and were melted in a vacuum induction furnace. Their microstructure was composed primarily of a martensitic matrix with a dispersion of TiC precipitates. Modification of TiC morphology was accomplished through changing the cooling rate during solidification. Wear rates of the TiC-reinforced Cr steels were comparable to that of AISI 440C steel, but the impact resistance was much improved.

Dogan, O.N.; Hawk, J.A.; Schrems, K.K.

2006-06-01

495

Biomimetic membrane arrays on cast hydrogel supports.  

PubMed

Lipid bilayers are intrinsically fragile and require mechanical support in technical applications based on biomimetic membranes. Tethering the lipid bilayer membranes to solid substrates, either directly through covalent or ionic substrate-lipid links or indirectly on substrate-supported cushions, provides mechanical support but at the cost of small molecule transport through the membrane-support sandwich. To stabilize biomimetic membranes while allowing transport through a membrane-support sandwich, we have investigated the feasibility of using an ethylene tetrafluoroethylene (ETFE)/hydrogel sandwich as the support. The sandwich is realized as a perforated surface-treated ETFE film onto which a hydrogel composite support structure is cast. We report a simple method to prepare arrays of lipid bilayer membranes with low intrinsic electrical conductance on the highly permeable, self-supporting ETFE/hydrogel sandwiches. We demonstrate how the ETFE/hydrogel sandwich support promotes rapid self-thinning of lipid bilayers suitable for hosting membrane-spanning proteins. PMID:21526805

Roerdink Lander, Monique; Ibragimova, Sania; Rein, Christian; Vogel, Jörg; Stibius, Karin; Geschke, Oliver; Perry, Mark; Hélix-Nielsen, Claus

2011-06-01

496

Thin section casting program: Volume 3, Vertical TSC (thin-section casting) approach: Final report  

SciTech Connect

A prototype vertical twin belt caster was designed, constructed and tested at Bethlehem Steel Corporation's Homer Research Laboratory for the development of a thin section casting process. In the prototype caster the moving mold was aligned vertically and each of the two endless steel belts was tensioned around an upper and a lower large pulley by means of a third smaller pulley. The mold consisted of a long parallel lower section and a shorter V-shaped top section into which liquid steel was fed from a tundish via a submerged refractory nozzle. Mold length, defined as the distance from the meniscus in the V-mouth to the tangent point of the lower pulleys, was about eleven feet. The length of the V-mouth was 27 in. The belts were continuously supported between the upper and lower pulleys by a unique back-up system. Downstream support consisted of two pairs of foot rolls and a vertical water-cooled steel structure that would permit a cast length of about nineteen feet. A chain driven bar was used to start a cast and support the slab. The aim was to cast 1 in. /times/ 17 in. sections at 250 in./min. The details of the prototype vertical caster, except the end walls, are given. The water modeling studies conducted at USSteel to establish tundish nozzle port sizes, inclinations and depth of submergence below the meniscus for optimum flow pattern in the V-mouth are included. The design analyses of the copper end walls and the 10-ton liquid steel trials conducted with the refractory end walls are presented. The fourteen liquid steel trials conducted with the vertical caster and the concluding remarks on vertical feeding system development are discussed.

Not Available

1989-01-01

497

Drug release mechanisms of cast lipid implants.  

PubMed

The aim of this work was to better understand which physicochemical processes are involved in the control of drug release from lipid implants prepared by melting and casting. Lipid implants gain steadily in importance as controlled parenteral drug delivery systems: In contrast to PLGA-based devices, no acidic microclimates are created, which can inactivate incorporated drugs. The melting and casting method offers various advantages over the commonly used direct compression technique. For example, powder de-mixing during manufacturing and highly challenging scale-up due to poor powder flowability are avoided. Importantly, broad spectra of drug release patterns can be easily provided by varying the type of lipid. The resulting drug release rates are generally lower than those of implants prepared by direct compression. This is probably due to the differences in the microstructure of the pore network of the systems. Drug or water diffusion plays a dominant role for the control of drug release, potentially combined with limited drug solubility effects, caused by the low amounts of water available within the implants. In the case of pure diffusion control, a mechanistic realistic mathematical theory is proposed, which allows for quantitative predictions of the effects of formulation parameters on the resulting drug release kinetics. Importantly, these theoretical predictions could be successfully confirmed by independent experiments. Thus, the obtained new insight into the underlying drug release mechanisms can significantly facilitate the optimization of this type of advanced drug delivery systems. This is particularly helpful if long release periods are targeted, requiring time-consuming experimental studies. PMID:21352913

Kreye, F; Siepmann, F; Willart, J F; Descamps, M; Siepmann, J

2011-08-01

498

Predicting Pattern Tooling and Casting Dimensions for Investment Casting, Phase III  

SciTech Connect

Efforts during Phase III focused mainly on the shell-alloy systems. A high melting point alloy, 17-4PH stainless steel, was considered. The experimental part of the program was conducted at ORNL and commercial foundries, where wax patterns were injected, molds were invested, and alloys were poured. Shell molds made of fused-silica and alumino-silicates were considered. A literature review was conducted on thermophysical and thermomechanical properties alumino-silicates. Material property data, which were not available from material suppliers, was obtained. For all the properties of 17-4PH stainless steel, the experimental data available in the literature did not cover the entire temperature range necessary for process simulation. Thus, some material properties were evaluated using ProCAST, based on CompuTherm database. A comparison between the predicted material property data and measured property data was made. It was found that most material properties were accurately predicted only over several temperature ranges. No experimental data for plastic modulus were found. Thus, several assumptions were made and ProCAST recommendations were followed in order to obtain a complete set of mechanical property data at high temperatures. Thermal expansion measurements for the 17-4PH alloy were conducted during heating and cooling. As a function of temperature, the thermal expansion for both the alloy and shell mold materials showed different evolution on heating and cooling. Numerical simulations were performed using ProCAST for the investment casting of 17-4PH stainless steel parts in fused silica molds using the thermal expansion obtained on heating and another one with thermal expansion obtained on cooling. Since the fused silica shells had the lowest thermal expansion properties in the industry, the dewaxing phase, including the coupling between wax-shell systems, was neglected. The shell mold was considered to be a pure elastic material. The alloy dimensions were obtained from numerical simulations. For 17-4PH stainless steel parts, the alloy shrinkage factors were over-predicted, as compared with experimental data. Additional R&D focus was placed on obtaining material property data for filled waxes, waxes that are common in the industry. For the first time in the investment casting industry, the thermo-mechanical properties of unfilled and filled waxes were measured. Test specimens of three waxes were injected at commercial foundries. Rheometry measurement of filled waxes was conducted at ORNL. The analysis of the rheometry data to obtain viscoelastic properties was not completed due to the reduction in the budget of the project (approximately 50% funds were received).

Sabau, Adrian S [ORNL

2008-04-01

499

Development of a thin steel strip casting process. Final report  

SciTech Connect

This is a comprehensive effort to develop direct strip casting to the point where a pilot scale program for casting carbon steel strip could be initiated. All important aspects of the technology were being investigated, however the program was terminated early due to a change in the business strategy of the primary contractor, Armco Inc. (focus to be directed at specialty steels, not low carbon steel). At termination, the project was on target on all milestones and under budget. Major part was casting of strip at the experiment casting facility. A new caster, capable of producing direct cast strip of up to 12 in. wide in heats of 1000 and 3000 lb, was used. A total of 81 1000-1200 lb heats were cast as well as one test heat of 3000 lb. Most produced strip of from 0.016 to 0.085 in. thick. Process reliability was excellent for short casting times; quality was generally poor from modern hot strip mill standards, but the practices necessary for good surface quality were identified.

Williams, R.S.

1994-04-01

500

Solidification science in cast MMCs: The influence of merton flemings  

NASA Astrophysics Data System (ADS)

The solidification science of cast metalmatrix composites (MMC) evolved as a subset of the broad field of solidification of monolithic alloys pioneered by Merton Flemings and his students. As a result of advances in solidification, the cast MMC field has evolved from its early incarnation—employing empirical research to engineer novel materials using versatile and cost-effective casting techniques—to using solidification-science-based approaches to tailor advanced materials for application-specific needs. The current and emerging applications of cast MMCs in a variety of automotive, aerospace, electronic packaging, and consumer-good industries exemplify the maturity of the field and the materials. Innovations in composite-forming techniques and efforts at wider industrial acceptance of MMCs will undoubtedly continue. However, the scientific principles underlying the solidification microstructure evolution that governs the composite properties have become well established, to a great extent, due to Flemings’ early, pioneering work on monolithic alloys and some of his more recent studies on solidification of reinforced metals. This paper reviews some aspects of solidification of discontinuously reinforced cast metals that owe their current understanding to Flemings’ contributions, in particular, the scientific understanding of macro- and microsegregation, fluidity and rheology of multiphase slurries, and stircasting, semi-solid casting, and preform infiltration. Current research to develop and test prototype components made from cast composites, including Al-flyash, Cu-graphite, Al-graphite, Al-alumina, and SiC-Al, is also presented, along with directions for future research.

Rohatgi, Pradeep; Asthana, Rajiv

2001-09-01