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The selection of wear-resistant materials is usually based on long-time testing. A method of structural investigations of materials can be used for reducing the duration of such tests. This method is based on the results of the transmission electron microscopy and X-ray investigations of the surface layers. Results of these studies show that every material is characterized by a definite state of the...
A white layer up to 20 μm in thickness is generated locally on the surface of digger teeth during service on excavators in iron ore mining. To test the effect of a white layer on abrasive wear resistance, samples with an artificially produced white layer were prepared by back-milling before wear testing. The wear resistance was investigated using two three-body laboratory wear tests; low stress abrasion...
Improvement of the wear properties of engineering components can be achieved by the application of surface coatings. In this paper, properties of the stress fields induced in such composite bodies by the application of normal and frictional loading distributions under plane strain conditions are studied. Attention is concentrated on those aspects of the stress fields which control the development...
The dry sliding wear performance of discontinuously reinforced aluminum (DRA) as investigated by numerous studies during the last two decades is reviewed and discussed. In general DRAs feature substantially better wear resistance than their respective unreinforced matrix. However, under particular conditions and wear mechanisms, the wear performance of the overall DRA-metal couple is similar to or...
The tribological application of electrodeposited chromium layers has been limited owing to the decline of its wear resistance at high speed and heavy load. Electrochemical metallization by means of brush plating has been developed for the deposition of Ni-Fe-W-S alloy layers. Friction and wear tests have been conducted to study the wear characteristics of this alloy layer under conditions of dry friction,...
Wear tests of lubricated journal bearings fabricated from a Si modified ZA27 alloy are described. The modified alloy shows significantly improved wear resistance compared with the ZA27. It is proposed that, in addition to the strengthening effect of the Si, an observed surface layer which develops on the running surface is responsible for the excellent wear performance. A mechanism for the formation...
A double mechanical alloying process (dMA) was employed to fabricate Al Fe and Al Fe Mn alloys containing finely distributed intermetallic compounds and inert dispersoids (Al 4 C 3 and Al 2 O 3 ). The tribological properties of the produced alloys were investigated under fretting conditions. It was shown that the fretting behaviour strongly depends on contact conditions...
Ring-on-square tests on two kinds of low-alloy carburized steel which were AISI 8620 and 4140 were carried out to study the dry sliding wear behavior. The influence of different retained austenite level of 6% to 40% was evaluated while trying to eliminate other factors. Test results show that the effects of grain size and carburized steel species are negligible in dry sliding wear behavior. While...
Wear behaviour of dual-phase AISI 1020 steel was investigated. The steel was austenitized at critical transformation temperature and rapidly quenched. Thus, the structure of the steel consists of martensite and ferrite phases in different proportions. Heat treated samples were subjected to wear with a cylinder-on-cylinder sample configuration under dry sliding conditions. Wear resistance was determined...
Wear-resistant bulk or layer materials have to be chosen by designers, but tribological stresses are complex and the properties of materials cannot be taken from a list. Thus, a well-founded selection requires a strategy, which is suitable for all engineers in production, design, and research. Such a strategy is presented in this paper. It makes use of the acting wear mechanisms as a link to materials...
The wear behaviour of high tensile strength aluminium alloys was studied by rubbing them against a steel counterface under both dry and lubricated conditions. The test materials used were extruded Al Zn Mg alloy (7004-T6) and Al Cu Mg alloy (2024-T4). In laboratory air, the mild wear rates of both aluminium alloys were almost the same. However, 7004-T6 easily caused severe wear at high contact...
The co-deposition of Al 2 O 3 particles with chromium is possible when a rare earth element is added into a conventional hexavalent chromium bath. The effect of various plating variables on the Al 2 O 3 content of the coating was studied. When the coating contains about 0.7-1.0 wt.% of Al 2 O 3 , the hardness of the composite coating has the highest...
Cast Fe-Mo-S wear-resistant alloy with and without CeO 2 was prepared with a medium frequency inducting oven. The effect of CeO 2 on the friction and wear properties of the alloy was examined with a block-on-ring friction and wear tester. The action of CeO 2 in the formation of surface film and its effect on the characteristics of the surface film were investigated by means...
The surface of an Al-Si-graphite particle composite was melted and self quenched after laser beam scans. The microstructure in the laser processed zone was much finer and more homogeneous due to the rapid solidification. The samples before and after laser treating were aged at different temperatures, leading to different hardness levels. A linear relationship was found between the wear resistance...
The paper discusses the advantages of parts' surfaces characterized by a regular roughness pattern obtained by using a method of vibrorolling. These surfaces are superior to those machined with conventional techniques, especially with regard to improvement in related parts' performance. The results of the investigation disclosed a change in the performance specifications of parts as a function of...
An effort has been made in the present investigation to correlate the deformation and sliding wear resistance of a series of nickel-cobalt and nickel-copper single phase, fcc, solid-solution alloys with their stacking fault energy (SFE) by conducting reciprocating sliding wear tests against a diamond ball in ambient air. The surface damage has been characterized through scanning electron microscopy...
The temperature distributions on the surface of Si 3 N 4 and Ti(CN) ceramic cutting tools for turning different metallic materials were calculated and plotted using computer simulation based on a mathematic model of heat sources. The results showed that the temperature on the rake face of the ceramic cutting tools for turning 18-8 stainless steel was much higher than that fur turning...
A semi-empirical model describing wear resistance of FeCrC white cast irons as a function of chemical composition and wear conditions has been used to analyse the effects of alloy composition. A wear criterion has been developed and then used to define an optimum alloy composition for a given set of wear conditions. The analysis is showed clearly that differing wear conditions require considerably...
The microstructural changes in worn surfaces of Mn6 and Mn13 steels before and after wear were investigated by the use of SEM, TEM and a back-scatter Mossbauer spectrometer. The results show that there exist two kinds of austenite for austenitic manganese steels before wear, one contains almost no carbon (C) and the other contains more C. The C atoms mainly exist in the octahedral interstitial sites...
The use of thermally sprayed coatings is a way of reducing wear and frictional losses. However, a limited number of studies have been done on the tribological behaviour of wear resistant coatings. Results of an investigation to evaluate the effects of some wear test conditions on air and vacuum plasma-sprayed (APS and VPS) TiCNiCrBSi coatings using a pin-on-disk tribometer have been presented in...
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