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The object of this paper is to investigate the influence of solid solution strengthening on the spalling behavior of railway wheel steel. White etching layer (WEL) was reproduced by twin-disc test and analyzed by phase transformation kinetic. Spalling of WEL was then evaluated by rolling contact fatigue (RCF) test and finite element analysis. The results show that solid solution strengthening improves...
Cemented carbides match properties required for many wear related applications through the control of microstructure such as Co binder content, WC grain size, type and content of additives, etc. However, their hardness is usually raised at the expense of fracture toughness. The effect of hard erodent particle impact energy on the wear of cemented carbides containing differently sized grains (fine,...
This publication describes a new quick and economical method for the simulation of tool wear in the deep drawing and stretch forming of steel sheets in the area of the drawn edge. This method also allows a comparative evaluation of the properties of different tool materials versus reference materials. In order to reduce the amount of required test cycles, a controlled amount of wear–inducing particles...
This paper presents the results and analysis of wear investigations carried out on a wear test bench with high strength sheet metal DP600+Z drawn over selectively oxidised α-Fe2O3 tool steel surfaces. Wear investigations were carried out with several selectively oxidised specimens by varying the pulling and counter force, and thus the surface pressure on the samples. This allowed for a systematic...
The influence of lubricant additives on rolling contact fatigue crack propagation and the mechanisms responsible for the resulting micro-scale damage, was studied via experiments conducted on complete transmissions in a test cell. Bench-scale tribological tests and the exposure of steel surfaces to two different formulated lubricants were also carried out. Scanning and Transmission Electronic Microscopy...
The connection between profile grinding of rails, martensite surface layers and crack initiation has been investigated using visual inspection, optical microscopy and 3D X-ray computerized tomography. Newly grinded rails were extracted and found to be covered by a continuous surface layer of martensite with varying thickness formed by the grinding process. Worn R350HT and R200 rails were extracted...
Material transferred from steel work materials onto the cutting tools largely affects tool life and machining performance. This material transfer is strongly influenced by the steel composition, and different alloying can have very different effects. Crossed cylinders sliding tests can be used to simulate the contact between the chip and the tool in machining. In this work such a test is used to evaluate...
Slurry transportation via pumping is an increasingly viable alternative for the conventional fine particle pumping, but there are also many applications involving larger particles. However, most of the published studies on slurry erosion have been conducted with fine particle sizes. In this work, also large particle slurry erosion of commercial wear resistant materials is studied. A high speed slurry-pot...
The in-service cutting edge of a mining loader bucket was investigated and its wear behavior compared with samples tested in the laboratory to assess how well the wear testing methods correlate with the in-service conditions. The examined in-service cutting edge of a bucket made of a wear resistant steel had been run in an underground mine with quarry gravel. The wear behavior of the cutting edge...
Rolling elements made of 52100 steel were subjected to high austenitizing temperatures to embrittle the steel. The embrittled rolling elements were intentionally given a rougher surface finish and were subjected to bearing tests under rolling-sliding conditions. Post-test material investigations revealed cracks in the raceways and rollers. Detailed electron microscopy investigations showed highly...
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