... commercial casting alloys can be remelted and cast to shape ... of al4c3, which also affects the casting fluidity of ... p/2014, (sic)p/6061, (sic)p/a356, (sic)p ...

... Title : Casting Defects and Properties of Cast A356 Aluminium Alloy Reinforced With SiC Particles. Descriptive Note : Journal article,. ...

Melting and casting characteristics of A356 (Al 7% Si) alloy reinforced with 10, 15, and 20 vol. % SiC particles were studied. Remelting followed by holding and solidification of these composites leads to settling of the SiC particles to the bottom of the mold. The height of the SiC particle-free zone formed at the top of the mold, as a result of settling, ...

... of a centrifugally cast A356 Al-SiCp ... MATERIALS), *ALUMINUM ALLOYS, *METAL MATRIX COMPOSITES, *CASTING, THERMOMECHANICS ...

... Title : A-356 TYPE ALUMINUM CASTING ALLOY. ... on the mechanical properties and part strengths of 'high purity' 356-T6 type aluminum alloys. ...

... Title : Hardness Characteristics in Aged Particulate SiC/A356 Cast Aluminium Alloy Composites. ... types:, (sic)w/al, a356 matrix, al alloys, al matrix ...

... Title : Fatigue and Fracture Toughness of Water-Chilled A356-T6 Cast Aluminum Alloy. Descriptive Note : Journal article,. ...

... IN EMBRITTLED ALUMINUM ALLOY A356, AN AGE HARDENING CASTING ALLOY, CRACKS ... BETWEEN THE CAST STRUCTURE'S ...

... ALUMINUM-SILICON ALLOY A356 WAS INVESTIGATED. ... EXPERIMENTS ON A356 SUBJECTED TO ... TEXTURE IN A CONVENTIONAL CASTING. ...

Centrifugation is a casting technology that allows the production of cylindrical and graduated parts with different mechanical properties through the section. The need for materials with good quality and specific mechanical properties has been driven this technology in order to produce different types of materials such as zinc alloys and graduated metal matrix composites ...

... 2. Bailey, WA, A356 Type Aluminum Casting ... of the Aluminum-Silicon- Magnesium Alloy System, Part ... Alloying Elements on Aluminum Casting Alloys ...

The ductility of casting allows is usually low and it is thus important to simultaneously assess the effect of changes to the microstructure and heat treatment on both ductility and strength of the material. The use for this purpose of the quality index charts is common in the casting industry with regard to the Al-Si-Mg casting alloys ...

A356 and A319 are aluminum-silicon casting alloys used in automobile powertrain castings such as engine blocks and cylinder heads. It is of interest to model solidification and microstructure evolution in these alloys as a function of melt composition and processing conditions. There are ...

... Abstract : Fatigue fractography of cast particulate-sic-reinforced al(a356) metal matrix ... at processing defects, such as casting shrinkage and ...

This investigation was performed to determine the effect of trace amounts of antimony (Sb) on the microstructure, mechanical properties, and casting properties of strontium-modified A356.2 aluminum alloy that was cast in chemically bonded sand molds. The ...

is an alloy which contains a percentage of beryllium ... A356 aluminum contains no beryllium, but is lower strength than the TENS. 50. A356 aluminum ...... Cast housing, mylar shaft seals, cast ball, revised seat ...

... Title : A-356 TYPE ALUMINUM CAST ALLOY. ... content on the mechanical properties and part strengths of ''high purity'' 356-T6 type aluminum alloys. ...

... hot water quenching for premium cast parts. ... presents that portion of the effort involving alloy A356. ... tests were made on different casting heats using ...

... of trace amounts of Sb on the microstructure, mechanical properties, and casting properties of Sr modified A356.2 Al casting alloy cast in chemically ...

... Fibre Reinforcement of Investment Cast Parts. ... types:, 201 matrix, a356 matrix, a357 ... young's modulus manufacturing:, casting process, fabrications ...

... Title : MICROSTRUCTURAL CHARACTERISATION OF SAND CAST ALUMINIUM ALLOY A356-SIC PARTICLE METAL MATRIX COMPOSITE. ...

A statistical grain nucleation model was implemented as a part of a multiphase flow and solidification simulation code for metallic alloys. Three characteristic parameters control the solution accuracy of the nucleation model: the total grain density, the mean undercooling, and the standard deviation of the undercooling. These parameters were obtained experimentally for ...

The present work was aimed at determining the minimum amount of Cu that would trigger the development of increased levels of microporosity in Sr-modified Al-Cu-Si-Mg alloys. Starting with (Cu-free) A356.2 alloy, three target levels of Cu were examined, 0.2%, 0.4% and 1%. The phases formed during solidification and the level of porosity ...

With the emerging demand for energy efficient and environment-friendly automobiles, cast aluminum alloys are increasingly being used in their manufacture. In this context, two permanent mold casting processes, namely, Squeeze Cast Permanent Mold and Low Pressure Permanent Mold (LPPM) have become very popular in the production of high ...

... Mechanical test were carried out to study the deformation behavior of particulate sic-reinforced al (a356) matrix composites produced through direct ...

... a gas that does not dissolve easily in the alloy, HIPping can ... selected from regions of various castings of aluminum alloys 356-T6, A356-T6, and ...

... nonheat-treatable titanium alloy offering moderate ... A356 cast aluminum possesses good castability and ... other high-strength aluminum casting alloys ...

... technology that can locally eliminate casting defects and ... 1) a doubling of strength of cast nickel-aluminium ... in ductility of Al alloy A356, (3) increased ...

... should be no great difficulty in designing an alloy that can ... improvements these alloys offer compared to two common casting alloys A356 and A201 ...

... ceramic particles to conventional aluminum alloys results in ... of Al2O3 particles and the casting alloy A356-T6 with ... was found that the cast matrix has ...

... Corporate Author : Personal Author(s) : Yarandi, FM ; Rohatgi, PK ; Ray, S. Report Date : 01 JAN 1992. Pagination or Media Count : 495. ...

... in this study, consisting of six different matrix alloys with lithium ... baseline minimum properties of conventional aluminum casting Alloy A356, as well ...

... micrometers SiC particles of varying volume fractions, dispersed uniformly in a modified aluminum A356 alloy by the melt stirring technique, were ...

Differential scanning calorimetry was conducted using centrifugally cast monolithic A356 aluminum material and 26 volume percent silicon carbide (SiC) particle reinforced A356 aluminum matrix composite material in as-cast, cast and rolled, and ...

In this paper, a relatively new approach is presented in order to predict the microstructure of A356 using finite element technique and artificial neural network. In the training and test modules of the neural network, different primary and secondary dendrite arm spacing obtained from finite element method were used as inputs and eutectic volume percentage, silicon volume percentage, silicon rod ...

... A356.0-T6 Casting *359.0-T6 Casting *520.0-T4 Casting ... Tin, Manganese, and Aluminum Bronze Castings Aluminum Bronze Bar ... Low Alloy Steels ...

... both A357 and A356 casting alloys indicates that ... heat treatment for high-strength aluminum alloy castings is ... A356 is the predecessor alloy of A357 ...

Cast Al alloys reinforced with SiC particulates offer improved resistance to wear, creep and fatigue crack initiation as well as significant increase in elastic modulus and strength in comparison with unreinforced Al alloys. In addition, they can be cast into near net shape or formed by conventional metal working techniques. However, incorporation of SiC ...

The main phases that are present in A356 aluminum alloy castings are the primary aluminum and eutectic silicon phases. It is the morphology of these phases, together with the microporosity, that determines the mechanical properties, notably the fatigue life of structural aluminum alloy castings. As part of a program to develop optimized tooling for the ...

Experimental data on directional and bulk solidification of hydrogen- charged samples of aluminum alloy A356 and nickel alloy Inconel 718 are discussed. The solidification structure of the porous zone is shown to be dependent on many process variables. Of...

A quantitative prediction of the amount of gas microporosity in aluminum and magnesium-alloy castings is performed with a continuum model of dendritic solidification. The distribution of the pore volume fraction and pore size is calculated from a set of conservation equations that solves the transport phenomena during solidification at ...

... The outer wing section of the assembly is a casting fabricated from A356 aluminum-alloy tempered to a T6 condition. INS TRUMENTAT ION ...

... Prelil- Snary studies of a numer of commercially available A356. ... Strength Aluminum Alloy Shaped Castings" concerns alloys containing 4 ...

aluminum alloys for piece-parts that experience relative motion in a GO2 or ..... All ball valve housings made of cast A356 material were subject to this ...

... composite material used was SiC particle reinforced A356 Al alloy, originally procured from Dural Aluminum Composites Corporation ...

... 3] has been applied to many types of aluminum, steel and ... Microstructure-based Fatigue Modeling of Cast A356- T6 Alloy.� Engineering Fracture ...

Mechanical Configuration. The monochromator is constructed in a monolithic housing. Cast from A356 aluminum alloy, the housing is precision machined ...

... manufactured by the squeeze casting technique was ... transition zone between unreinforced alloy and composite ... zone for saffil a356 aluminum alloy ...

... scanning calorimetry was conducted using centrifugally cast monolithic a356 aluminum material and 26 volume percent silicon carbide (sic ...

... Magnesium and its alloys (use requires approval), Aluminum alloy 5052, 5056, A356 (and other casting alloys), 6061 6013, and 6063 (and other ...

The plastic deformation behavior of aluminum casting alloys A356 and A357 has been investigated at various solidification rates with or without Sr modification using monotonic tensile and multi-loop tensile and compression testing. The results indicate that at low plastic strains, the eutectic particle aspect ratio ...

... casting macrosegregation, formation of channel type casting defects, and casting grain structure. Dendritic solidification experiments during ...

... type), when heat treated in 3-inch casting thickness, exhibits ... a heat treated, 1-inch thick, cast plate ... Alloy A356 (silicon-magnesium type) ranked third ...

Experimental data on directional and bulk solidification of hydrogen-charged samples of aluminum alloy A356 and nickel alloy Inconel 718 are discussed. The solidification structure of the porous zone is shown to be dependent on many process variables. Of these variables, hydrogen content in the melt prior to ...

All previous studies on interfacial heat transfer coefficient have been based on indirect methods for estimating the heat flux that employed either inverse heat transfer analysis procedures or instrumentation arrangements to measure temperatures and displacements near the metal-mold interface. In this paper, the heat transfer at the metal-mold interfaces is investigated using a sensor for the ...

In recent years, the squeeze casting process has been widely used with various aluminum alloys to manufacture near-net shape automotive components. Preliminary research has also demonstrated technical feasibility potential of squeeze casting for magnesium. A better understanding of squeeze casting process is essential for applying the ...

Autogenous Nd:YAG laser welding wrought 4047, 1100, 3003, 2219, 5052, 5086, 5456, and 6061 and cast A356 aluminum alloys to cast A356 aluminum alloy in restrained annular weld joints was investigated. The welds were 12.7 mm (0.375 in.) and 9.5 mm (0.375 i...

Fatigue life- and cyclic stress response curves for specimens in four different aging conditions are obtained from a DC-cast A356 alloy. During aging a change in the precipitation structure is observed, which affect the fatigue behavior and the surface cr...

Corrosion characteristics of as-cast, silicon carbide particulate-aluminum (Al) alloy A356 (SiC[sub p]-A356 [UNS A13560]) were examined in chloride (Cl[sup [minus

Forgings: ASTM B-247, alloy 6061 T6. f. Castings: ASTM B-26, alloy A356 T6. g. Finish: Fluoropolymer, Kynar. Aluminum: Fluoropolymer, Kynar 500. b. Stainless Steel: AISI No. 4, bright directional polish. c. Steel. f. Castings: ASTM B-26, alloy A356 T6. g. Finish: ...

A method is presented to use a dimensionless form of the well-known Niyama criterion to directly predict the amount of shrinkage porosity that forms during solidification of metal alloy castings. The main advancement offered by this method is that it avoids the need to know the threshold Niyama value below which shrinkage porosity forms; such threshold ...

The semi-solid-metal, SSM, processing deals with semi solid slurries, in which non dendritic solid particles are dispersed in a liquid matrix with apparent viscosity values near to that of liquid. It is able to flow easily under pressure and fills complicated die cavities to manufacture sound as-cast products with high integrity. The SSM slurry is prepared through different ...

A drop forge viscometer was employed to investigate the flow behavior under very rapid compression rates of A357, A356 diluted with pure aluminum and Al-4.5%Cu alloys. The A357 alloys were of commercial origin (MHD and SIMA) and the rheocast, modified A356 and Al-4.5Cu alloys were produced by a process developed at ...

In the present work, functionally graded (FG) aluminum alloy matrix in-situ composites (FG-AMCs) with TiB2 and TiC reinforcements were synthesized using the horizontal centrifugal casting process. A commercial Al-Si alloy (A356) and an Al-Cu alloy were used as matrices in the present study. The material parameters (such as matrix and ...

... Metal-Matrix Composites Manufactured by Squeeze Casting. ... Abstract : Squeeze-cast mmc ingots have ... manufactured by recasting a356/10% sic(p ...

... Abstract : The detailed microstructure of cast aluminum alloys based on Al-7 pct Si-0.3 pct Mg (A356) has been investigated as a function of Fe and ...

... Abstract : By the addition of 10-20 vol.% fine sic particles to investment-cast al alloys (a356.0 and a357.0), increases in strength will be realized. ...

... temperatures; to photograph several fractured A356-T6 cast test bars ... R-5 tensile specimens machined from an A356-T6 sand casting (57-23215 ...

... Title : Corrosion Behavior of As-Cast Silicon Carbide Particulate-Aluminum Alloy Metal-Matrix ... material types:, (sic)p/356, (sic)p/a356, (sic)p ...

The Casting and Solidification Technology (CAST) experiment will study the phenomena that occur during directional solidification of an alloy, e.g., constitutional supercooling, freckling, and dendrite coarsening. The reduced gravity environment of space ...

... Title : Refining of the Solidification Structure of Continuously Cast 18%Cr Stainless Steel by Electromagnetic Stirring,. Corporate Author : ...

... Title : SOLIDIFICATION, STRUCTURES, AND PROPERTIES OF CAST METAL-CERAMIC PARTICLE COMPOSITES. Corporate Author : ...

... Title : INVESTIGATION OF SOLIDIFICATION OF HIGH STRENGTH STEEL CASTINGS UNDER SIMULATED PRODUCTION CONDITIONS. ...

Cerium enhances formation of graphite nodules. Preliminary experiments in directional solidification

Autogenous Nd:YAG laser welding wrought 4047, 1100, 3003, 2219, 5052, 5086, 5456, and 6061 and cast A356 aluminum alloys to cast A356 aluminum alloy in restrained annular weld joints was investigated. The welds were 12.7 mm (0.375 in.) and 9.5 mm (0.375 in.) diameter with ...

The tensile properties and fracture behavior of cast aluminum alloys A356 and A357 strongly depend on secondary dendrite arm spacing (SDAS), Mg content, and, in particular, the size and shape of eutectic silicon particles and Fe-rich intermetallics. In the unmodified alloys, increasing the cooling rate during ...

... ferrous, one titanium, and two aluminum cast alloys. The alloys evaluated were Marage 250, 17-4PH (H900), D6AC (220-240 ksi), A356-T61, CH70 ...

... Inlet 77' - - SS 347 Housi Y 29. Fuel Boost Pump Discharge 770 - - Al A356 Cast Housing 30. Fuel Boost Pum, mpeller 77" - - Al 7075-T73 31. ...

... BODY, 24S-T4 OR EQUIVALENT ALUMINUM ALLOY LINER, NON-POROUS TEFLON ... Aluminum Alloys 356A Cast ... U- I- A356-T6 Hard Anodized ...

... 26. ... 1. Bearings - all M50, except the brake bearings are 52100 2. All aluminum housingo - A356-T6 castings 3. Quill shaft, high-speed assembly - ...

Aluminum Alloys: A356 -T6, 606.1-T6, 7079-116, 7075-T6, 2219-T61, .... The 347-C alloy was cast in bars and annealed at. 19500 for 30 minutes. ...

Ni-Span-C, 440C stainless steel, A356 cast aluminum, Berylco x. "Super PEL" beryllium, and Ti-5A1-2.5 Sn. With the exception of. 1 the titanium alloy, these ...

... Abstract : The dry sliding wear behaviour of cast aluminium 7% si alloys (a356) reinforced with ... 100) occurred in the unreinforced al-si alloy at 95 n ...

cast in a graphite mold. Change of apparent viscosity of 20vol%SiC/Al-6.5wt%Si ...... (A356 aluminum alloy) with silicon carbide of 10 to 20 _m. ...

... (TENSILE VALUES REPORTED ARE THI FOUNDRY CHILLING MAGNESIUM 2 HOURS 3 HOURS ... 0 H cay'i I;MflOd Page 34. SM-43094 Page: 25 I ...

Aluminum Alloy A356-T6, Microstructure h6. lO1. Average Tensile Properties of. Aluminum Alloys. 18. 102. Tensile Properties of Cast Aluminum ...

The stainless steel alloy 17-4PH contains a martensitic microstructure and second phase delta ({delta}) ferrite. Strengthening of 17-4PH is attributed to Cu-rich precipitates produced during age hardening treatments at 900-1150 F (H900-H1150). For wrought 17-4PH, the effects of heat treatment and microstructure on mechanical properties are well-documented [for example, Ref. 1]. Fewer studies are ...

Centrifugal casting is a widely applied method for production of graded metal matrix composites (MMCs). This paper discusses some aspects of the macrostructure management of centrifugally cast particle reinforced MMCs. A specially developed software product is applied for the analysis of many technological regimes for casting ...

The study on the behavior of metals in the semisolid state was pioneered by David Spencer at MIT in 1971. He applied a shear strain on solidifying Sn-15 pct Pb alloy, and discovered a remarkable reduction in shear stress comparing with those that were not sheared during solidification. The grain structure of the sheared alloy was nondendritic, as opposed to the dendritic ...

The solidification behavior of ceramic particle-reinforced metal-matrix composites (MMCs) is different from that of the bare matrix, not only because of the presence of the ceramic particles, but also due to their redistribution in the melt that results in nonhomogeneous thermophysical properties. The MMCs comprised of 10- to 15-{micro}m SiC particles of varying volume ...

The solidification behavior of ceramic particle-reinforced metal-matrix composites (MMCs) is different from that of the bare matrix, not only because of the presence of the ceramic particles, but also due to their redistribution in the melt that results in nonhomogeneous thermophysical properties. The MMCs comprised of 10-to 15-?m SiC particles of varying volume fractions, ...

The experimental observations of the solidification of cast iron have been interpreted using modern ideas in solidification theory to explain spheroidal graphite formation. In addition to experiments with cast iron, spherulites of ice were grown in the tr...

A solution method for finding the unknown solidification interface in manufacturing slab ingots as a

... Title : On Refining the Solidification Structure of Continuously Casted 18% Cr Stainless Steel Slab Electromagnetic Stirring. Corporate Author : ...

... Accession Number : AD0676235. Title : INVESTIGATION OF SOLIDIFICATION OF HIGH-STRENGTH STEEL CASTINGS. ...

... Accession Number : AD0661056. Title : INVESTIGATION OF SOLIDIFICATION OF HIGH-STRENGTH STEEL CASTINGS. ...

A solution, developed to obtain solidification-interface shapes for complex situations in which both

... of Unidirectional Solidification of Single Crystals of High ... Abstract : A model has been developed to ... in the production of single crystal castings; the ...

... Accession Number : ADD133146. Title : Analysis of Solidification and Cooling Process in Continuously Casted Aluminum Slab,. Corporate Author : ...

Application of nondestructive electronic property measurements to assess the strengthening of Mg2Si precipitates in aluminum A356.2 casting has been demonstrated. The results indicated the evolution of precipitation phase through over aging with increased cooling time or thickness of the cast part. The classical ...

... dendrite spacing of different aluminum castings (DC cast ... block casters; and Properzi cast rod) has ... of a variation in the casting conditions discussed. ...

Topics included are: Process improvement, Mold-steel interface reactions, Precision-cast dies, Directional solidification techniques, Ferrous die casting, and Titanium castings.

... Title : Mechanical Properties of Sand Cast Aluminum Alloy Test Castings ... of the variations in solidification rate which might be expected in a casting. ...

... Title : Solidification, Structures, and Properties of ... cast metal-ceramic particle composite materials ... or soft ceramic particles (including microballoons ...

... A rapid-cycle casting process for steel vis diffusion solidification (SD) has been developed. Solidification takes place by carbon redistribution ...

DIRECTIONAL SOLIDIFICATION OF FLAKE AND NODULAR. CAST IRON DURING KC-135 LOW-G MANEUVERS. P. A. Curreri. Space Science Laboratory ...

Video compilation of videos on casting manufacturing with the following titles: * Metal pouring * Induction melting of metal * Mold filling movie * Investment casting * Lost foam filling movie * Casting filling animation * Horizontal centrifugal casting * Horizontal centrifugal casting * ...

A microstructural analysis of local microfracture of cast A356 Al-SiC{sub p} composites fabricated by permanent mold re-casting and squeeze-casting methods was made. Notch fracture toughness tests were conducted on these composites to identify critical fracture parameters using a ...

Pressure and velocity are generally discontinuous at the solidification front when the solid domain is deformed. This discontinuity, which has been ignored in most conventional solidification models for continuous casting processes, could cause significant numerical error around the solidification front in ...

... Status of projects related to directional solidification of peritectics, segregration of nickel base supperalloys, and casting of NITINOL are summarized ...

... Pagination or Media Count : 72. ... Descriptors : *IRON ALLOYS, *CASTING, *SOLIDIFICATION, SLURRIES, THERMAL ANALYSIS, ZINC ALLOYS ...

... Descriptors : *MICROSTRUCTURE, *ALUMINUM ALLOYS, *SOLIDIFICATION, *CASTING, *CASTING ALLOYS, *LEAD ALLOYS, *TIN ALLOYS ...

... Abstract : The relation of dendrite structure, nonmetallics and microporosity to solidification time and refinement by inoculation was investigated and ...

... Title : CAST MICROSTRUCTURE OF INCONEL 713C AND ITS DEPENDENCE ON SOLIDIFICATION VARIABLES,. Corporate Author : ...

Video compilation of videos on casting manufacturing with the following titles: * Metal pouring * Induction melting of metal * Mold filling movie * Investment casting * Lost foam filling movie * Casting filling animation * Horizontal centrifugal casting * Horizontal centrifugal casting * ...

Nanoparticles in metal matrix nanocomposites (MMNCs) were shown to act as catalysts for nucleation of solidification of the matrix alloy, as well as to alter the intermetallic phase formation. These phenomena were studied in zinc, aluminum, and magnesium alloys. In all alloys studied, a refinement of the microstructure was seen with the addition of the nanoparticles. Various ...

... solidification rates in end-chilled cast plates of A356 aluminum alloy. ... severely impaired in directionally fed sections of cast plates from ...

... Title : Rapid Cycle Casting of Steel. ... Abstract : In the SD (diffusion solidification) casting process high carbon liquid iron is brought into contact with ...

Two solidification models were extended to encompass a broader range of solidification conditions consistent with the directional solidification (DS) methods at Marshall Space Flight Center (MSFC). The restriction to horizontal solidification was removed,...

The paper deals about a new patented process able to the production of high resistance and high toughness parts, taking into consideration also the tooling need. The molten alloy is introduced into the die cavity at low pressure, then the alloy is forged. The forging action takes place during the alloy solidification process, favouring the reduction of the duration of the ...

Based on a review of recent as well as of classic literature selected topics of the physical metallurgy of cast iron are presented. Solidification of cast iron is given special attention. Some nucleation and growth theory is included, and eutectic solidif...

This book contains papers divided among the following sections: process monitor and control in welding; plasma processing and refining; strip casting; modelling of welding processes; CAD/CAM in casting; investment and die casting; ingot, continuous and other shape casting; and rapid ...

Microporosity in cast aluminum alloys may originate from hydrogen gas evolution, microshrinkage, or a combination of both. A spatial analysis method for the quantitative discrimination between shrinkage and gas porosity is presented and explained. It is shown that shrinkage pores can be selected and analyzed separately from gas pores by nearest-neighbor analysis. The ...

... Title : Modeling Characteristics for Solidification in Single-Crystal, Investment-Cast Superalloys. Descriptive Note : Journal article,. ...

Page 1. INVESTIGATION OF SOLIDIFICATION OF HIGH-STRENGTH STEEL CASTINGS AMMRC CR 63-04/F FINAL REPORT for ...

A356. 0.10. 35. 35. 0.35. 0.35 10. 10. 1,.0 1.0. TITAN 11 I. CAST ...... development, or ln alloy development ln recent times. Currently, the ...

PROJECT NERVA. Contract SNP-1. 3. "i ,. ^* f\\~^. 5 .... 2. Braze Alloy. Specimens .of A-286 alloy have been vacuum brazed with AGC-7 and ... Material specifications for 85$ of the components in the NRX A-l ...... APPLIED RESEARCH. 1. Coating Systems ... shown evidence of a metallurgical bond to cast A356 aluminum. ...

A preliminary master engine -layout drawing of the NERVA ..... Report No. I0560- 10-1. Item 1.1.5 WTW ASPECTS OF ENGINE DESIGN ... mum design can be selected for this application. . ,. Page 7. 4. GiONF. IDENT'I,AL -rRD ..... Report No. L0560- 10-1 is. Evaluation of cast aluminum A356 was initiated to determine ...

In the present paper a thorough study of the fatigue crack initiation mechanisms of a defect-free and a commercially cast A356 aluminum alloy are presented. Further, fatigue crack growth has been investigated in these materials. Finally an attempt to desc...

A number of 7xx aluminum casting alloys are based on the ternary Al-Zn-Mg system. These alloys age naturally to high strength at room temperature. A high temperature solution and aging treatment is not required. Consequently, these alloys have the potential to deliver properties nearly equivalent to conventional A356-T6 (Al-Si-Mg) ...

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 to predict dimensional changes occurring during solidification and cooling of a steel casting

A successful method of die casting plutonium is described. The method is an improvement over conventional pour-cast techniques in that the plutonium can be solidified more rapidly. One advantage of rapid solidification is that cast structures can be impro...

The usual method for simulating die-castings consists of a solidification analysis of the casting process--a computer calculation of heat transfer between the casting and the die components. The use of cyclic simulations, coupled with the geometric accura...

In casting, fluidity is the measure of the distance a metal can flow in a channel before being stopped by solidification. During mold filling, the metal loses heat to the surrounding mold, thereby cooling and becoming more viscous until the leading portio...

In the SD (diffusion solidification) casting process high carbon liquid iron is brought into contact with low carbon solid iron isothermally, and the liquid solidifies by rejecting carbon to the solid. The solidification mechanism is controlled by mass tr...

The influence of B content on solidification and porosity formation in cast N-base superalloys was examined. Because the solubility of B in gamma-solid solution is limited, the melt at the solidification front may be enriched in B. For superalloys contain...

... of Sn-15% Pb alloy and aluminum alloys 6061 and A356 were heated to ... SOLIDIFICATION, FORGING, RHEOLOGY, CASTING, CASTING ALLOYS. ...

The evolution of the new technology of producing CAD models by ultraviolet solidification of resin materials (''STEREOLITHOGRAPHY'') continues to progress. The potential application area of rigid fabrication of prototype investment castings is becoming mo...

The current study deals with the microstructural modification of a nodular cast iron during solidification under the influence of high magnetic fields (up to 18 tesla).

... unit, used for casting Sn-15%Pb alloy. ... Iron alloys, Solidification, Machines, Costs, Copper alloys, Compatibility, Tin alloys, Lead alloys. ...

An Optical Study of Grain Formation: Casting and Solidification Technology (CAST ) (2-IML-1). Information concerning the objectives, procedures, ...

electro-slag casting or remelting (ESC or ESR), vacuum arc melting (VAR) and continuous casting, in addition to che directionally solidified single crystal ...

... Crack Growth in AC4CH Cast Aluminum Alloys. ... strength processing: casting miscellaneous and ... technical terms: aluminum alloys , eutectic particles ...

... numerical simulation of casting processes, two ... a small brake cylinder (cast in permanent ... keywords: experimental, ductile iron, graphite, austenite ...

The purpose of this paper is to review important aspects of titanium alloy properties, casting methods, and solidification modeling. The survey provides a background on the physical metallurgy of titanium alloys including alloying and microstructure, the ...

... Title : VARIATION OF MC CARBIDE GEOMETRY WITH LOCAL SOLIDIFICATION TIME IN CAST INCONEL 713C ALLOY,. Corporate Author : ...

Casting of metal matrix composites can develop imperfections either as non- uniform distributions of

... Abstract : The purpose of this paper is to describe the structure and the properties of a well known conventionally cast alloy, AZ91 HP, rapidly ...

Abstract: ... reactions, rapid solidification processes, the electroslag casting process, the role of cathodic depolarizers in the corrosion of aluminum in ...

... Automation, Stainless steel, Nickel alloys, Solidification, Mechanical properties, Rupture, Porosity, Molding materials, Cracking(Fracturing ...

... tool industry, Sand, Annealing, Grain structures(Metallurgy), Solidification, Cracks, Microstructure, Photomicrography, Penetration, Ordnance steel ...

... of Solute Redistribution on the Structure and Properties of Cast Alloys. ... This report summarizes work on composite and alloy solidification presently ...

cal model for the casting of alloys, an experimental study has been conducted to generate benchmark data with which such a solidification ...

Use of integral analysis for development of appriximate solution for solidification in cylindrical thermally resistive mold.

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 ...

In the absence of gross defects such as cold shuts, the fatigue properties of castings are largely determined by the sizes of microstructural defects, particularly pores and oxide films. In contrast, the effects of grain size, second-phase particles, and nonmetallic inclusions are insignificant. The authors review the fatigue properties of castings made by ...

The paper discusses theoretical and technical aspects related to computer modeling of the two main phases of casting process: turbulent or laminar metal flow by the CASTFILL model and nonisothermal solidification by the CASTSOL model. The formulation of the filling and the solidification problems, the simulation results, and the ...

Casting of Lead-free Solder Bulk Specimens With Various Solidification Rates J. Madeni*, S. Liu*, T The casting of lead-free solder bulk samples has been investigated by varying the conditions of solidification. Cooling rate effects were specifically analyzed using small solder droplets. Excellent correlations

The presence of microporosity can, in certain circumstances, lead to a significant reduction in the mechanical properties of cast aluminum alloys. The size of the microporosity is especially crucial to the performance of castings in fatigue applications. The aim of this study is to investigate the effect of cooling rate and degassing time on the formation ...

Fracture related mechanical properties of materials (ductility, toughness, etc.) depend on microstructure. Materials science literature contains large number of contributions where attempts have been made to relate the average properties of microstructure (for example, average particle size, average grain size, etc.) to the mechanical properties such as ductility, toughness, etc. However, the ...

We examine the dependence of fatigue properties on the different size scale microstructural inclusions of a cast A356 aluminum alloy in order to quantify the structure-property relations. Scanning electron microscopy (SEM) analysis was performed on fatigue specimens that included three different dendrite cell sizes (DCSs). Where past ...

The Bauschinger effect is interpreted as anisotropic work hardening that arises upon reverse loading from internal backstresses that are attributed to dislocations accumulating at obstacles. Studies to describe the Bauschinger effect have either focused on continuum mechanics modeling or on analyzing dislocation build-up at a microscopic scale. In continuum mechanics, the focus often is on the ...

Alloy casting solidification processes involve many physical phenomena such as chemistry variation, phase transformation, heat transfer, fluid flow, microstructure evolution, and mechanical stress.1 Simulation technologies are applied extensively in casting industries to understand the effects of these phenomena on the formation of ...

Solidification is a critical phase change occurring during welding that controls weld metal microstructure, properties, and ultimately weldability of alloys. In recent years, significant advances have been made in the solidification theories that relate to castings and rapidly solidified materials. A critical need exists to understand ...

Ten MC4073/4369 programmer base plates were analyzed. This component, a programmer base plate for the SRAM II (and later the SRAM A), is specified as a Grade C quality casting made of aluminum Alloy A356, heat treated to the T6 condition. A concern was expressed regarding the choice of an A356 casting for this ...

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 allo...

Grain structure and dendrite morphology play key roles in determining the shape, size, and distribution of microsegregation, inclusions, and microporosity in as-cast alloys. The casting parameters that most directly control solidification structure are lo...

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 composit...

The relation of dendrite structure, nonmetallics and microporosity to solidification time and refinement by inoculation was investigated and correlated to mechanical properties of AISI 4335 steel castings. The dendrite spacing is determined by solidificat...

In the research work presented here, mechanical properties of a thixoformed A356 alloy were measured and compared with the mechanical properties of rheocast and gravity-cast alloy with the same composition. In the thixoforming process, a 60% solid fraction rheocast alloy was reheated to 600 deg. C or 610 deg. C, held about 10 min, and ...

Transmission (TEM) and scanning electron microscopy (SEM) are employed to study the SiC/Al-alloy interface in a cast SiCp/Al(A356) metal matrix composite (MMC). Magnesium aluminate (spinel), MgAl2O4, was found at the interface as a reaction product after material processing. Comparisons of the crystal structure, structure factor, and ...

Here, is the macro-micro modeling, in its present form, does not include the effect of melt superheat. In this work, identical castings of sand, permanent mold, and lost foam processes were produced by pouring aluminum alloy A356 at 700, 750, 800, 850, and 900 C. Grain size increased with pouring temperatures to different levels in the ...

Papers are presented on titanium, aluminum, magnesium, and ferrous-metal castings. Particular attention is given to the titanium castings for Space Shuttle attachment fittings, the die filling and solidification of Al-Si alloys in high-pressure die casting, the 1988 investment casting industry, ...

Cast iron is an alloy that has long known and still remains one of the most important structural materials. It is a unique composite material whose properties depend on the close control of composition and mode of solidification. As the applications increase and demands for properties become more severe, there is an ever increasing need for the better ...

Solidification behavior controls the size and shape of grains, the rate and extent of segregation, the distribution of inclusions, the extent of defects such as porosity and hot-cracking, and, ultimately, the properties of weld metal. In the past, theories related to single crystal growth technology and castings have been extrapolated to describe weld ...

The purpose of the present study is to understand the nature of the solidification of cast irons using the directional solidification technique. Cast irons can solidify directly by either the graphite-austenite or the iron carbide-austenite eutectic reactions. The existence of two eutectic systems is probably the ...

The integrity and performance of a weld is, to a large extent, controlled by the solidification behavior of the weld metal or fusion zone (FZ). It controls weld-metal microstructure, grain structure, inclusion distribution, porosity, hot-cracking behavior, and, ultimately, weld-meted properties. Weld metal solidification can be understood in the light of ...

The integrity and performance of a weld is, to a large extent, controlled by the solidification behavior of the weld metal or fusion zone (FZ). It controls weld-metal microstructure, grain structure, inclusion distribution, porosity, hot-cracking behavior, and, ultimately, weld-meted properties. Weld metal solidification can be understood in the light of ...

Using the finite difference method, a nonstationary problem of metal solidification in a wedge-like casting mold has been solved in a two-dimensional statement with allowance for natural convection. For isolated instants of time the positions of the solidification front, the profiles of temperature, horizontal and vertical velocity ...

The process of melting and solidification in metal casting is considered. The process is modeled by a three-dimensional two-phase initial-boundary value problem of the Stefan type. The mathematical formulation of the problem and its finite-difference approximation are given. A numerical algorithm is presented for solving the direct problem. The results are ...

The purpose of the present study is to understand the nature of the solidification of cast irons using the directional solidification technique. Cast irons can solidify directly by either the graphite-austenite or the iron carbide-austenite eutectic react...

The influences of different electromagnetic field intensities on the solidification structures of industrially centrifugally cast 25Cr20Ni stainless steel tubes have been investigated in detail. The results reveal that the electromagnetic field exerted during the centrifugal solidification causes a marked variation in the structures of ...

Solidification of molten metals during various casting methods poses many practical problems associated with phase transformation and heat transfer processes. Evaluation of solidification time is one of the very important parameters used for assessing the properties of the material. In the present study, experimental investigation is ...

The current state-of-the-art of computer simulation of solidification was reviewed. Brief descriptions are given for methods of handling the latent heat of fusion and analog, finite element, finite difference, and pseudo-steady state technique used to simulate solidification. Methods of reducing manpower requirements are discussed as well as general ...

At least one element of a superalloy cast into a refractory oxide-silica investment mold is oxidized to form a metal oxide barrier layer at the mold-metal interface to permit directional solidification of the cast superalloy at elevated temperatures without metal-mold reaction. 3 figures.

A mathematical description of centrifugal casting of long pipes in rapidly-rotating ingot molds is given. The effect of gravity force is neglected. A numerical solution is obtained for the solidification of a steel casting in a thermally insulated mold. The effect of the rate of metal pouring on the motion of the ...

Incremental spray casting (ISC) is a novel approach to direct processing of alloys requiring rapid solidification to achieve desired properties. The process is a variation of spray casting in which a thin liquid layer of metal is maintained on the substrate surface. Microstructures and tensile properties of aluminum alloys processed by ...

The microstructure of austenitic stainless steel welds can contain a large variety of ferrite morphologies. It was originally thought that many of these morphologies were direct products of solidification. Subsequently, detailed work on castings suggested...

This report comprises the second year of a two year program on a Rapid Solidification, extrusion processing and mechanical property measurement of Magnesium alloys. During the second year, samples were cast using a controlled atmosphere (He gas), and vert...

The plasma-melt-overflow process combines transferred plasma-arc, skull-melting techniques and melt-overflow, rapid-solidification technology to cast ...

By studying the unidirectional growth of a metal-model material in microgravity, an attempt is made to characterize alloy solidification. Using holograms and supporting temperature measurements obtained during processing in the Fluids Experiment System (F...

The studies are part of a continuing research activity on solidification and thermomechanical processing of aluminum ingots. The work is presented in three parts. (I) Experimental Verification of a New Heat Flow Analysis of Solidification; (II) Filtration...

The work comprises a theoretical and experimental study of macrosegregation in solidification of ingots and castings. A general expression is given for macrosegregation, which is viewed as resulting from mass flow into, or out of, local regions of the ing...

The distribution of reinforcement in 10% SiC and 20% SiC{sub p} reinforced A356 alloy processed by gravity casting, squeeze casting, and roll casting is studied by using the mean free path, nearest neighbor distance, radial distribution function, and quadrat methods. The study is performed by ...

The effect of quenching condition on the mechanical properties of an A356 (Al-7 wt pct Si-0.4 wt pct Mg) casting alloy has been studied using a combination of mechanical testing, differential scanning calorimetry (DSC), and transmission electron microscopy (TEM). As the quench rate decreases from 250 C/s to 0.5 C/s, the ultimate tensile strength (UTS) and yield strength ...

The effect of quenching condition on the mechanical properties of an A356 (Al-7 wt pct Si-0.4 wt pct Mg) casting alloy has been studied using a combination of mechanical testing, differential scanning calorimetry (DSC), and transmission electron microscopy (TEM). As the quench rate decreases from 250 �C/s to 0.5 �C/s, the ultimate tensile strength (UTS) and yield strength ...

This investigation was performed to determine the effect of trace amounts of antimony (Sb) on the microstructure, mechanical properties, and casting properties of strontium-modified A356.2 aluminum alloy that was cast in chemically bonded sand molds. The aluminum-silicon alloys were prepared in a high-frequency ...

Mechanical tests were carried out to study the deformation behavior of particulate SiC-reinforced Al (A356) matrix composites produced through direct casting using the molten metal mixing method. The matrix alloy-Al (A356) was also tested as a control material for comparison. The elastic ...

A concentric solidification technique was employed to simulate the segregation of alloying elements that occur during solidification at the centreline of continuously cast steel. Microstructural development of low carbon steel upon solidification has been observed in situ in a laser-scanning confocal microscope. ...

A simulation of a benchmark test casting has been performed with the CaPS-3D casting process simulator software. The test casting was made at the University of Birmingham in the UK for the 7th International Conference on the Modeling of Casting, Welding and Advanced Solidification Processes. ...