... Title : The Problem of the Dependence of Wear Resistance of Metals during Abrasive Wear on Their Physicomechanical Properties,. ...
DTIC Science & Technology
... Title : Comparison of the Microstructures and Abrasive Wear Properties of Stellite Hardfacing Alloys Deposited by Arc Welding and Laser Cladding,. ...
... Title : The Influence of Particle Properties on the Erosive Wear of Sintered ... that their wear resistance depends on the nature of the abrasive particles. ...
The article examines the dependence of wear resistance of metals during abrasive wear on the basic physicomechanical parameters. The dependence of wear resistance and critical velocity on the same parameters during friction of metals on an abrasive surfac...
National Technical Information Service (NTIS)
General theories of abrasive wear are reviewed, and wear is related to abrasive size, shape, hardness and degradation tendency. Treatment of matrix effects includes the roles of matrix microhardness, subsurface deformation and retained austenite on abrasion resistance. Discussion of second ...
Energy Citations Database
... Title : The Effect of Abrasion Resistance and Thermal Properties of the Cemented Carbide Cutting Tool Grade on the Flank Wear Characteristics. ...
A systematic study of abrasive wear resistance of Fe/Cr/Mn based alloys has been carried out using a two body pin-on-disc wear machine. Abrasives used were silicon carbide, alumina and quartz. The objective of this study was to evaluate the abrasive wear ...
... from federally funded research, testing and training ... showed some detectable abrasion by five ... WEAR RESISTANCE, TEST AND EVALUATION ...
... from federally funded research, testing and training ... agencies for Research Development Test and Evaluation ... tear strength, and abrasion resistance ...
... from federally funded research, testing and training ... agencies for Research Development Test and Evaluation ... room temperature in abrasion and dry ...
... Title : The Abrasive Wear of Borosilicate Glass. Descriptive Note : Journal article,. ... Abstract : The abrasive wear of borosilicate glass was studied. ...
... ion implantation, titanium addition, tungsten addition testing and test conditions: abrasion test miscellaneous and special technical terms: wear. ...
High stress abrasive wear behavior of mild steel, medium carbon steel, and hardfacing alloy has been studied to ascertain the extent of improvement in the wear properties after hardfacing of steel. High stress abrasive wear tests were carried out by sliding the specimen ...
The development of commercially viable diesel engines that operate directly on pulverized coal-fuels will require solution to the problem of severe abrasive wear. The purpose of the work described in this report was to investigate the nature of the abrasive wear problem. Analytical studies were carried out to ...
DOE Information Bridge
This monograph gives a general classification of the various types of wear, including abrasive wear; it describes the principles and systems of laboratory tests for abrasive wear, the regularities of this form of wear under various conditions - during fri...
A systematic study of abrasive wear resistance of Fe/Cr/Mn based alloys has been carried out using a two body pin-on-disc wear machine. Abrasives used were silicon carbide, alumina and quartz. The objective of this study was to evaluate the abrasive wear resistance and to ...
... Title : ABRASIVE WEAR RESISTANCE OF POLYMERS USED IN ULTRASONIC FLAW INSPECTION. Corporate Author : ...
... Accession Number : AD0682112. Title : ABRASIVE WEAR RESISTANCE OF CONSTRUCTIONAL MATERIALS AND MACHINE PARTS,. ...
The properties of composite resin for dental fillings were improved by development, but its weakness continues to be its wear strength. Several tests have been proposed to evaluate wear in composite resin materials. The aim of this study was to verify how polishing and the type of abrasive can influence the ...
PubMed
The abrasive wear properties of stir-cast A356 aluminum alloy-5 vol pct fly ash composite were tested against hard SiC{sub p} abrasive paper and compared to those of the A356 base alloy. The results indicate that the abrasive wear resistance of aluminum-fly ash composite is ...
It is well known that abrasive wear resistance is not strictly a materials property, but also depends upon the specific conditions of the wear environment. Nonetheless, characteristics of the ceramic microstructure do influence its hardness and fracture toughness and must, therefore, play an active role in ...
This book discusses the properties of coal mineral matter abrasion and particle impaction erosion wear in those power plants using coal. Its main thrust is to provide remedial measures for these problems, Since coal is such a soft, flow-strength material, its wear-causing characteristics depend largely on the ...
Contents: Peculiarities of a micro-impact load in cavitation-abrasive action; Cavitation and cavitation-abrasive wear in the flow around a rectangular projection by a hydroabrasive current; Structure and properties of cavitation-resistant steel 30Kh10G10;...
... ABRASIVE WEAR OF MATERIALS IN A BLAST FURNACE UNDER ACTUAL WORKING CONDITIONS by ... 09.TI1rLE ABRASIVE WEAR OF ...
The research approach undertaken by the authors relative to the subject, and examples of results from the authors are reviewed. The studies include programs in adhesion, friction, and various wear mechanisms (adhesive and abrasive wear). The materials which have been studied include such ceramic and metallic materials as silicon ...
The effect of different experimental factors on the high-stress abrasive wear properties of steels has been studied. A correlation among the factors has been established by linear regression analysis. A computer software in Microsoft Basic language utilizing linear regression analysis has been developed with the capability of ...
The effects of slurry rheological properties on the erosive wear of grinding media and grinding efficiency (percent minus 325 mesh) have been studied in a laboratory ball mill using minus 10 mesh quartzite. A laboratory procedure was also utilized to eval...
A systematic study of abrasive wear resistance of Fe/Cr/Mn experimental steels has been carried out in two-body pin-on-disc abrasion tests. Silicon carbide, alumina, and quartz were used as abrasives. The relationships between microstructures, mechanical properties, and ...
... only abrasive but also corrosion wear has been established [1-5]. ... Since abrasive wear is taken as the main mechanism of wear, ...
... abrasive are presented; and the capability of the grain geometry parameters to ... Subject Categories : SOLVENTS, CLEANERS AND ABRASIVES. ...
... Accession Number : AD0720379. Title : The Mechanism of the Variation in the Abrasive Wear Resistance of G13L Steel After Hardening,. ...
... Accession Number : AD0749769. Title : The Abrasive Wear Resistance of Vacuum-Condensed Coatings,. Corporate Author ...
... Title : STUDIES ON ABRASIVE WEAR OF MONOLITHIC SILICON NITRIDE AND A SILICON CARBIDE WHISKER-REINFORCED SILICON ...
... Accession Number : AD0724985. Title : Resistance to Abrasive Wear of Chromium Alloys with Additions of Carbide-Forming Elements,. ...
... Title : RESEARCH ON THE ABRASIVE WEAR RESISTANCE OF MANGANESE CAST IRON INOCULATED WITH CERIUM, USING THE Kh4-B ...
... Title : QUICK AND SIMPLE TEST FOR ABRASIVE WEAR RESISTANCE AND ITS PRACTICAL USE,. Corporate Author : ...
... Accession Number : ADD139343. Title : On the Abrasive Wear of AISI 4340 Steel,. Descriptive Note : Conference Paper,. ...
... IN A RUBBER-WHEEL ABRASION TEST (RWAT) AND ... IN A GRINDING WHEEL TEST (GWAT ... WEAR TESTING ON THE WHITE IRONS HAS BEEN ...
... The deformation studies included abrasive wear, elastic strain, and plas- ... Major results are as follows: 1. Abrasive Wear ...
... Title : ABRASIVE WEAR RESISTANCE OF STRUCTURAL STEELS DEPENDING ON THE HEAT-MECHANICAL TREATMENT (HIGH ...
... Accession Number : AD0193871. Title : ABRASION AND WEAR STUDIES BY MEANS OF RADIOACTIVE ISOTOPES. Corporate Author : ...
... Effect of Aging on the Abrasion Behavior of ... characteristics and data fields:, abrasions, aging data ... sizes, wear rates, wear resistances testing and test ...
... cu, whiskers, material characteristics and data fields:, abrasive wear data, fiber data testing and test conditions:, abrasion tests, sem manufacturing ...
... Accession Number : ADD150933. Title : The Abrasion and Abrasion- Corrosion Properties of 9 Percent Chromium Steel. ...
The abrasive wear of brittle materials, while not a true property of materials, is generally modeled as an inverse function of both the bulk hardness and fracture toughness. According to these models, an increase in the hardness and/or fracture toughness of a material will therefore enhance its wear resistance. In ...
An evaluation is made of the tribological properties of particle-dispersed Al alloy matrix composites, which encompass sliding wear, friction, seizure-resistance, and abrasive wear; this last obtains in composites incorporating a solid lubricant as well as the hard ceramic particles. In the case of prospective ...
Wear-resistant hard-alloy coatings (facings) of high-carbon iron-based alloys, with a composition close to that of tool steels, are used to increase the abrasive-wear resistance of working friction surfaces of products. The authors aim here is to study the mechanical properties of the deposited metal after different technological ...
The structure, hardness, abrasion, and erosion wear of Cr-Mo white iron (containing approximately 28% Cr and 1% Mo) heat treated at certain temperatures were studied. Results show that the heat treatment of white iron changes the structures and properties; that is morphology, amount, size, and distribution of secondary phases are ...
... Title : ABRASION DAMAGE OF TEXTILE FIBERS. ... Descriptors : *PHYSICAL PROPERTIES, *TEST EQUIPMENT, *TEXTILES, ABRASIVES. ...
A series of alloy white irons and Co-base superalloys are being tested for low-stress abrasion resistance in a rubber-wheel abrasion test (RWAT) and for gouging wear resistance in a grinding wheel test (GWAT). The objective of the tests is to establish general relations for the improvement of wear resistance by the ...
In the present work, the effect of an Mg addition on the mechanical properties of the Al-60 vol pct SiC p composites were investigated by uniaxial compression, three-point bending, impact and wear tests (composite-metal and composite-abrasive types). The composites were produced by the pressure-infiltration technique. The composition ...
NASA Astrophysics Data System (ADS)
Two medium carbon low-alloy MnSiCrB cast steels containing different Cu contents (0.01 wt pct and 0.62 wt pct) were designed, and the effect of Cu on the mechanical properties and corrosion-abrasion wear behavior of the cast steels was studied. The results showed that the low-alloy MnSiCrB cast steels obtained excellent hardenability ...
A composite material consisting of WC-Co particles in a steel matrix was fabricated by sintering mixtures of WC-Co particles and a steel powder and infiltrating the sintered pieces with a copper alloy. Its wear resistance and mechanical properties were studied as a function of the content in WC-Co particles and other characteristics of the composite ...
The article deals with the evaluation of abrasive wear resistance and adhesive strength of thermally sprayed coatings. The main attention was paid to differences between low- and high-stress abrasive conditions of the measuring. Conclusions include the evaluation of specific properties of the WC-Co and the ...
The volume theory of ball wear ascribes ball consumption in grinding mills only to impactive wear, whereas the surface theory ascribes it only to abrasive wear, and ball-wear data are often in good agreement with either or both of these theories. In this ...
Techniques for characterizing and improving the wear properties of metals and composites are discussed in reviews and reports. Topics addressed include the use of interatomic potentials to study the relationship between abrasive wear and other mechanical properties, gas-detonation powder ...
Wear 252 (2002) 322�331 A physically-based abrasive wear model for composite materials Gun Y. Leea 2001 Abstract A simple physically-based model for the abrasive wear of composite materials is presented-matrix composite material. � 2002 Elsevier Science B.V. All rights reserved. Keywords: ...
E-print Network
The dry reciprocating wear characteristics of two abrasion-resistant steels, C1095 and 15B37H, against an abrasive material were studied. Results showed that abrasive wear and surface fatigue were the primary wear mechanisms. The wear failure of the ...
An ultra-high strength steel based on Fe-3Cr-0.4C for structural and abrasive applications has been designed and its structure-property relationships have been established. The microstructure has been characterized as dislocated lath martensite containing...
Research is presented which focuses on the micro-mechanical processes that dominate the friction and wear of rubber. New test concepts and equipment were developed to study the dynamic and kinematic effects involved in these processes. Several new analytical tools were presented to explain the observed results in quantifiable terms. Experiments conducted on filled NR confirmed ...
A plain carbon steel was overlayed with a wear-resistant hardfacing alloy by manual arc welding. Low stress abrasive wear tests were conducted with an ASTM rubber wheel abrasion tester using crushed silica and as the abrasive medium. The wear rate decreased with sliding ...
Aggregates are subject to crushing and abrasive wear during manufacturing, placing, and compacting hot mix asphalt concrete (HMAC), and, therefore, must be hard and tough to resist degradation and disintegration at different stages. Within the last few ye...
The properties of synthetic aluminum oxides (sapphire and ruby) and their applications in watchmaking (watch bearings and watchglasses) and as hard-wearing components such as centering devices for optical fibres and water jet nozzles for material cutting ...
The friction coefficient of steel during drilling in various lubricating media decreased in the order water, drilling muds, air, and oil drilling fluids. The properties of the boundary liquid layer had a decisive effect on the lubricating capacity when dr...
Research on the physicomechanical properties and structure of the strengthened layer obtained by diffusional alloying of carbon steel reveals the laws governing the surface-layer destruction of strengthened and unstrengthened steel in an abrasive and corrosional medium. Carbide layers obtained by multicomponent saturation are shown to have greater ...
Tungsten-based metal matrix composites (MMCs) were produced by compacting tungsten powder followed by infiltration with liquid 56Cu-43Zn-1Sn and 60Cu-40Ag. It was found that higher tungsten contents were associated with improved wear resistance. This effect, however, is small compared to the effect of different infiltrant alloys. An infiltrated species of higher ductility ...
The two major goals of the project are to improve our understanding of the mechanisms of carbide removal and of the role of matrix properties in abrasion. In the area of carbide removal mechanisms, progress this year has included completion of the fixed-depth scratch test apparatus and its use to demonstrate the occurrence of gross carbide cracking under ...
... Title : Wear of Si3N4 Ceramics by Abrasive Water Jet. ... Abstract : The wear mechanism of ceramics by abrasive water jet (AWJ) has been studied. ...
The three-body abrasive wear characteristics of four different ceramic materials were investigated. The work focused on the influence of the type of abrasive particles (alumina and silicon carbide) on the wear rate and the dominating wear mechanisms. A solid-state-sintered silicon carbide ...
... from federally funded research, testing and training ... agencies for Research Development Test and Evaluation ... mechanisms in the abrasion of Co ...
... AND FOR GOUGING ABRASION TESTING, BASED ON A ... BEEN EVALUATED AS TEST STANDARDS FOR ... LOW-STRESS TESTING HAS BEEN ...
... from federally funded research, testing and training ... for Research Development Test and Evaluation ... AND HIGH-STRESS (GOUGING) ABRASION. ...
... from federally funded research, testing and training ... for Research Development Test and Evaluation ... ON THE ABRASION WEAR RESISTANCE OF ...
... Title : An Improved Multipurpose Abrasion Tester and Its Application for the Evaluation of the Wear Resistance of Textiles. ...
... Abstract : Mild alloy and stainless steels are compared regarding wear abrasion and corrosion resistance for tools and comminution devices. ...
Aug 6, 2011 ... The Mars Pathfinder Rover Wheel Abrasion Experiment was designed to study the abrasive wear of the martian soil on various types of metals ...
NASA Website
... ABSTRACT A standard off-the-shelf Taber Abraser instrument is used to quantify the abrasive wear resistance of high-density polyethylene jackets ...
... Accession Number : ADD138359. Title : Wear Resistance of Steels Under Wet-Abrasive Erosion Conditions,. Descriptive Note : Journal Article,. ...
Results show that increased deformation in Duralumin during age hardening and after annealing increases the wear resistance to flowing abrasive particles. (R.V.J.)
... federally funded research, testing and training ... for Research Development Test and Evaluation ... for Severe Abrasion-Wear Hardfacing Application,. ...
... Abstract : Laboratory testing procedures used to evaluate ... for their resistance to adhesive wear and dry ... The abrasion test described utilizes a gravity ...
... wear resistances parameter values relevant to the data:, volume fractions testing and test conditions:, abrasion tests, abrasive wear tests, sem, three ...
... Title : Influence of a Corrosive-Abrasive Medium on the Wear Resistance of 12Kh18N10T Steel with Surface Hardening,. ...
... a strong grain size effect on abrasive wear mechanisms in ceramics, a series of tests were conducted under severe sliding contact conditions in an ...
... Accession Number : ADD201218. Title : Corrosion-Resistant and Abrasive Wear-Resistant Composite Material for Centrifugally Cast Linings,. ...
... Accession Number : ADD126259. Title : Abrasive Wear of Cast Aluminium Alloy-Zircon Particle Composites,. Corporate Author : ...
... Accession Number : ADD150069. Title : Abrasive Wear Study of Bainitic Nodular Cast Iron. Descriptive Note : Journal article,. ...
... Accession Number : ADD150868. Title : Abrasive Wear Resistance of High-Carbon Chrome-Nickel Steel. Descriptive Note : Journal article,. ...
A comparative study of the influence of randomly-oriented SiC whiskers on the abrasive wear behavior of several commercially-produced Si3N4- and Al2O3-based ceramics suggested that the residual stress states present within the materials can be important in predicting their wear resistance. The addition of SiC whiskers to the Si3N4 ...
An empirical approach to tool wear, which requires a series of machining tests for each combination of insert and work material, has been a standard practice for industries since early part of the twentieth century. With many varieties of inserts and work materials available for machining, the empirical approach is too experiment-intensive that the demand for the development ...
A detailed review of wear resistance properties of austempered ductile iron (ADI) was undertaken to examine the potential applications of this material for wear parts, as an alternative to steels, alloyed and white irons, bronzes, and other competitive materials. Two modes of wear were studied: adhesive ...
This work provides readers with practical advice on the selection of wear resistant materials for specific engineering purposes. Contents include: general review of wear; nature of wear; fretting; three body abrasion; gouging wear; low stress abrasion; erosion; corrosive ...
The authors examine the relationships between the ultrasonic machining, grain size, and wear resistance of boron and silicon carbides, candidate tool materials for cutting nitride ceramics. On the basis of mechanical tests and microscopic and fractographic analysis they recommend grain sizes of 60-100 micrometers for boron carbide and 80-100 micrometers for silicon carbide for ...
Wear resistant TiCo/Ti2Co dual-phase intermetallic coatings were fabricated on a titanium alloy by laser cladding. Microstructure of the coatings consists of isolated irregular block-like TiCo primary phase in the Ti2Co matrix. The coatings have high hardness and excellent abrasive and adhesive wear resistance under dry sliding ...
The article presents the characteristics of pearlite rail steels used in the construction of railways. The article discusses the influence of isothermal annealing process parameters on the pearlite morphology and properties of the R260 steel. The pearlite structure with a diverse pearlite morphology was obtained in the physical modeling of the isothermal annealing on the 3800 ...
The purpose of the M.I.T. research on wear during the calendar year 1977 was to apply the delamination theory of wear in minimizing the wear rate of splines and door hinges. The technique explored was the use of thin soft metal coatings on hard substrates...
Nanocrystalline Ni-Co, amorphous Cr-C alloy and nanocrystalline Cr-C coatings were electrodeposited from 'environmentally acceptable' electrolytes as potential substitutes for conventional nanocrystalline Cr coatings electrodeposited from noxious hexavalent chromium. The structure, morphology and hardness of coatings are investigated using a transmission electron microscope, a scanning electronic ...
The microstructure of cobalt-based hardfacing alloys deposited by manual metal arc (MMA) welding, tungsten inert gas (TIG) welding, and laser cladding has been investigated as part of a study attempting to establish the relationship between microstructure and abrasive wear properties. For typical deposition conditions, the differences ...
The design of a hazardous waste immobilization facility at the Savannah River Site (SRS) set material requirements for both abrasion resistance and corrosion resistance in process equipment. Standard ASTM slurry wear test G75 was modified to permit evaluation and comparison of abrasive resistance of candidate materials of construction ...
... from federally funded research, testing and training ... for Research Development Test and Evaluation ... Wear Debris; The Abrasion Characteristics of ...
... The wear and abrasion resistance of various plastics used for various applications (automotive brake linings, pipe linings, gun barrel surfaces ...
... Title : WEAR RESISTANCE OF HIGH-CHROMIUM STEELS IN AN AIR-ABRASIVE MEDIUM AT HIGH TEMPERATURES,. ...
... Abstract : The forms and character of wear of hydraulic turbines, axial and centrifugal pumps due to abrasion by suspended accretions and ...
... The epoxy compounds were more resistant to abrasion by sand blasting than the other compounds. The maximum wear ...
... from federally funded research, testing and training ... of simultaneous action of abrasion and chemical wear ... in a laboratory test, predict performance ...
... PRINCIPAL WEAR MECHANISMS INVOLVES REMOVAL OF PLASTICALLY DEFORMED, EXPOSED MATERIAL FROM THE LIPS OF IMPACT ...
... Wear resistance of Fiberglass Reinforced Polyester surfaces are usually considered to be somewhat less than that of melamine surfaced laminates. ...
... a flow of gas under conditions ... Descriptors : *BLAST FURNACES, CORROSION INHIBITION ... ELECTROCHEMISTRY, CORROSIVE GASES, WEAR ...
Page 1. TRANSLATION ABRASIVE PROPERTIES OF MICROCONTAMI NATION AND OXIDATION PRODUCTS OF JET FUELS BY ...
This paper describes recent developments of a practical, low cost embedded plastic optical fiber (POF) wear sensor system for the condition based maintenance of external outboard water lubricated bearings aboard U.S. Navy Ships. The benefit of this measurement system over the status quo is the ability to remotely monitor bearing wear. The Embedded ...
The abrasive wear resistance of the Fe64Co30Si3B3, Co86.5Cr4Si7B2.5, Fe73.5Nb3Cu1Si13.5B9, and Fe82.6Nb5Cu3Si8B1.4 commercial amorphous alloys (ribbon 0.03 mm thick and 12 mm wide) has been investigated under the conditions of abrasive and adhesive wear upon sliding friction. The character of fracture of the ...
Earthmoving, mining, and minerals processing each involve frequent, and often severe, mechanical interactions between metals, and between metals and abrasive nonmetallic and metallic materials (i.e., mineral bearing ores). The abrasive nature of ores causes significant wear to extracting, handling, and processing equipment. ...
The effect of composition on the wear resistance of plastics was studied. Wear was related qualitatively to friction, strength, and ductility. Two types of wear were analyzed: ordinary wear due to repeated surface deformation, and abrasive wear due to mic...
In densifying engineering ceramics such as TiB2 using nonmetallic sinter additives, it is important to assess the influence of the addition of sinter-aid on the properties of TiB2. The present article reports how a small addition of MoSi2 (5 wt pct) sinter-aid enhances the wear resistance of TiB2 at mode-I fretting contact. This has been confirmed using a ...
During the Apollo era, astronauts exploring the Moon experienced numerous unexpected material wear issues that were attributed to the presence of fine-grained lunar dust. These jagged, irregularly shaped dust particles are created by constant micrometeorite bombardment and retain their abrasive properties due to lack of weathering in ...
The authors assess the feasibility of recreating the mechanical properties of tungsten carbides in a titanium carbide-chromium steel composite for the purpose of conserving tungsten and reducing materials costs in the production of highly wear-resistant alloys. To this end they investigate the effects of production, materials content, surface hardening, ...
In this program, Advanced Ceramics Research, Inc. (ACR) proposed to develop a process to fabricate abrasive fluid (such as ore slurries) handling components with ceramic liners that exhibit improved wear and friction properties when compared to metal or c...
Silicon carbide ceramics (SiC) with 2 wt% Al2O3 and without additive were fabricated by hot-pressing. Their sliding and abrasion wear were investigated in relation to hot-pressing temperature. SiC hardly densified without sintering additive. The bulk dens...
The objective is to establish quantitative relations between microstructure and wear resistance for highly alloyed white irons and Co-base powder metallurgy (PM) alloys commonly used in coal mining, handling and conversion processes. The studies on cast irons and Co-base alloys clearly illustrate the importance of tailoring the microstructure of an alloy to the ...
... COMPARISON OF WARP AND FILLING DIRECTION ABRASION RESULTS ... inserted into a hole drilled into the ... was not possible to drill beyond this ...
... and agencies for Research Development Test and Evaluation ... DRY SLIDING, ABRASION, AND EROSION TESTING WAS PERFORMED. ...
A 12-channel wear screening device was used to compare the wear properties of a variety of prosthetic joint materials. Two types of tests were run: (1) Ultrahigh molecular weight (UHMW) polyethylene bearing against metal or ceramic counterfaces and (2) various polymers bearing against 316 stainless steel as a standard counterface. ...
Titanium and its alloys are used significantly in defense, aerospace and biomedical device components. However, their poor wear resistance and surface integrity leads to galling and seizure of surfaces when contact or relative motions of surfaces are involved. Surface hardening of Ti is therefore actively pursued to minimize the wear and fretting of ...
Standard procedures have been developed for low-stress abrasion testing, based on a rubber wheel test system, and for gouging abrasion testing, based on a grinding wheel test system. AISI 1020 and 4340 steels have been evaluated as test standards for both systems, and the 1020 has been found to provide best reproducibility. Low-stress testing has been ...
The material, mechanical, and clinical aspects of surface degradation of resin composite dental restorative materials by in vitro wear simulation continues to be an area of active research. To investigate wear mechanisms, a series of experimental resin composites with variable and controlled filler particle shape and loading were studied by in vitro ...
Hard and super-hard materials have very good abrasive wear resistance. However, in many severe wear environments that make use of these materials, impact is a significant component of that environment. Consequently, the behavior of many of these hard materials in impact-wear conditions need to be understood with ...
The presence of hard abrasive particles in the impact zone between parts of machines is the reason for their intensiveabrasive-impact wear. No attempt to analytically account for the features of the interaction of hard abrasive particles with the wear surface during impact has been made, even though such ...
... and wear behavior which was primarily abrasive (Ref 5:38, 45). This ... fer plate and measuring its thickness with a micrometer. The wear of ...
During the past two decades there has been significant progress in the field of surface treatments for reducing wear in engineering tools and components. These developments have further stimulated the study of wear mechanisms, especially in the tribologically important ferrous alloys. Wear rates are strongly dependent on the ...
In the progress report for 1977-1979, an extensive literature survey was completed in the areas of abrasive wear mechanisms, wear testing and microstructural effects on abrasive wear. Definitions of the various abrasive wear processes were clarified. A ...
Cemented carbides are used for a wide variety of applications where wear is a problem. Usually the wear of the cemented carbides is a combination of metal-to-metal and abrasion. Wear can occur at room or elevated temperatures. This research summarizes initial research to understand the abrasive ...
Aim of this research program is to establish the effect of mill size and batch or continuous operation on the role of corrosive and abrasive wear during mineral grinding operations. Grinding ball wear tests are being conducted on the laboratory, pilot pla...
The relative contributions of abrasion and corrosion and the effect of scale-up on the wear rates of three different grind materials in molybdenite and taconite ore milling under three mill atmospheres was investigated. A standardized marked ball wear tes...
A simple physically-based model for the abrasive wear of composite materials is presented based on the mechanics and mechanisms associated with sliding wear in soft (ductile) matrix composites containing hard (brittle) reinforcement particles. The model i...
The author proposes a wear model for the abrasive wear of solids. The model scheme is based on the following: microscopic contacts appearing in the course of friction of deforming surfaces exist in coupled states of adhesion and slip which do not prevent ...
... a digestive tract as opposed to occlusal or abrasive wear. None of the wear facets have the ... cusps and blades of this tooth show significant abrasive wear. The empty tooth spaces mesial to the ... ...
NBII National Biological Information Infrastructure
The book deals with theoretical and applied problems of the wear resistance of materials and machine parts. Main attention is devoted to abrasive wear which shortens the service life of agricultural, mining, construction, and other machines and industrial...
The microstructural properties of WC-Co-Cr and WC-Co coatings deposited by high-velocity oxygen fuel (HVOF) and high-velocity air fuel (HVAF) processes were investigated. The tribological behavior of the coatings was studied by means of pin-on-disk tests. Microcracking of the HVOF sprayed WC-Co coatings did not allow preparation of suitable disks for wear ...
The sliding abrasion wear rates of metallic materials against flint, measured between 25 and 1050 C under an argon atmosphere, are shown and discussed. Above 550 C, wear is governed mainly by the properties of the metal matrix and can be correlated with its resistance to plastic deformation. Thus, the hot hardness ...
The friction and abrasive wear behaviour of an Al-Si1MgMn aluminium alloy reinforced with 10, 15 and 30 vol.% of alumina fibers has been evaluated. The influence of fiber content, matrix hardness, applied load as well as the hardness and size of the abrasive grits was investigated. The tests were performed with a pin-on-drum two-body ...
Plasma-sprayed aluminum oxide (AI2O3) and chromium oxide (Cr2O3) coatings were sealed by aluminum phosphates. Phosphates were formed throughout the coating, down to the substrate, and were verified by scanning electron microscopy and hardness measurements. The sealing increased the hardness of the coatings by 200 to 300 Vickers hardness (HV) units. Abrasion and erosion ...
Abrasive wear is the most common type of wear that causes failure of machine elements. Examinations of abraded surfaces revealed presence of embedded particles and grooves elongated along the sliding direction. This indicates that, there are two sequential stages of an abrasion process. In the first stage, ...
The use of ferrographic analysis in conjunction with light and scanning electron microscopy is described for the elucidation of wear mechanisms taking place in operating equipment. Example of adhesive wear, abrasive wear, corrosive wear, rolling element f...
The structure-property relationships of an ultra-high strength steel with a chemical composition that was based on Fe-3Cr-0.4C are described. The microstructure, which consisted of dislocated lath martensite containing fine carbides and interlath thin films of retained austenite, was found to give combinations of mechanical properties and ...
The effect of abrasive particle size on the wear behavior of the SiC particle-reinforced aluminium composites produced by liquid metallurgy was investigated under different sizes of SiC grits at a fixed speed. The results show that the wear loss of composite was considerably lower than that of aluminium alloy. The ...
The abrasive wear behavior of titanium metal-matrix composites produced by powder metallurgical techniques was studied. Ti powder was mixed with 0, 20, or 40 volume percent (v%) TiB2, TiC, TiN, SiC, an B4C powder to produce a composite powder blend. The blends were consolidated by hot-pressing at 1200° C and 20 MPa for 2 hours. Also a series of Ti-TiB2 ...
The main emphasis of this work has been to determine the wear rate of silicon in fluid environments and the parameters that influence wear. Three tests were carried out on single crystal Czochralski silicon wafers: circular and linear multiple-scratch tests in fluids by a pyramidal diamond simulated fixed-particle abrasion; ...
Dual phase (DP) steels have been prepared from low carbon steel (0.14% C) at intercritical temperature 740�C and time is varied from 1 minute to 30 minutes followed by water quenching. These steels have been characterized by optical microscopy, FE-SEM, hardness measurements, tensile properties and electron backscattered diffraction (EBSD) studies. Tensile ...
There has been an increase in interest of late regarding the properties of thermally sprayed WC-Co cermets with nanograin carbide particles. These powders have shown interesting properties in sintered components, giving high values of hardness (2200 2300 VHN) and improved wear properties. The method used for the ...
ZrO2-Al2O3 laminated ceramics of 3 layers were prepared by dry-pressing and pressureless sintering, and their mechanical properties and toughening mechanisms were studied. Furthermore, their tribological behaviors and wear mechanisms under dry friction and water lubrication conditions were also investigated, and compared with those of monolayer ZrO2-Al2O3 ...
The wear properties of oxidized and non-oxidized gamma-TiAl (a potential biomaterial) as well as Ti-6Al-4V and CP-Ti disks were studied and characterized by means of standard wear tests using a custom made bone pin arrangement. The Ti-based disks were oxidized in air at 500 and 800 degrees C for one hour. The tribological ...
Contamination of the lube-oil with hard abrasive particles leads to a three-body abrasive wear mechanism that highly accelerates piston ring/cylinder liner wear in coal-fueled diesel engines. One approach to reducing that wear is to modify the size and or...
This bibliography contains citations concerning theoretical, experimental, and practical considerations of abrasive wear of various materials, types of surfaces, tools, machinery, equipment, etc. Wear mechanisms, wear resistance, wear rates, and wear protection are ...
The potential of this work is based on consideration of wear volume map for the evaluation of abrasive wear performance of polytetrafluoroethylene (PTFE) and PTFE composites. The fillers used in the composite are 25% bronze, 35% graphite and 17% glass fibre glass (GFR). The influence of filler materials, abrasion ...
An ultra-high strength steel based on Fe-3Cr-0.4C for structural and abrasive applications has been designed and its structure-property relationships have been established. The microstructure has been characterized as dislocated lath martensite containing fine carbides and surrounded by thin films of retained austenite. This results in excellent ...
Apr 15, 1998 ... Sojourner rover showing Lewis' wheel abrasion experiment. ... These tests created wear conditions more severe than simple rolling. ...
Austempering of ductile irons has led to a new class of irons, Austempered Ductile Irons (ADIs), with improved mechanical strength and fracture toughness lacking in gray cast irons. Laboratory wear tests have been used to evaluate the abrasive and impact-abrasive wear behavior of a suite of ADIs. The use of ...
... from federally funded research, testing and training ... for Research Development Test and Evaluation ... better than proprietary abrasion-resistant alloys ...
... from federally funded research, testing and training ... for Research Development Test and Evaluation ... the combined effects of abrasion and corrosion. ...
... Abrasives can also get into the seal interface, causing 1� rapid wear, short life, and leakage. When abrasive conditions are severe, some secondary ...
... from federally funded research, testing and training ... is caused by abrasion, interfacial adhesion ... w2a.15a, particulates, abrasions, friction, hardness ...
... Developed from federally funded research, testing and training ... a review article on abrasion in multiphase ... of single-point scratch test simulation of ...
Apr 16, 1996 ... NASA Lewis Research Center's Wheel Abrasion Experiment (WAE) will measure the amount of wear on wheel surfaces of the Mars Pathfinder rover. ...
Abrasion Tester. Background Many years before Apollo astronauts walked on ... Be sure to wear eye protection and gloves. Use a hammer to smash the rocks. ...
