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To understand the microstructural evolution of a pearlitic rail steel during rolling–sliding contact friction, phase structure and mechanical properties of deformed layers, from top surface to inner matrix, were investigated gradually by scanning electron microscopy, electron probe microanalysis (EPMA), X-ray diffraction, transmission electron microscopy (TEM) and nano-hardness indentation. Focused...
The effects of slippage on rolling contact of pearlitic wheel–rail steels (rail-U71Mnk/wheel-ER8 steels for China high-speed railway) have been investigated in the laboratory on a twin disc tester under different slippages (varying from 0.17%, 0.91%, 2.38%, 4.55%, to 9.43%). The morphology of the worn surface and the cross-sections have been detected by scanning electron microscopy (SEM), and the...
As the main component of the tire treads, styrene butadiene rubber (SBR) is widely used to make tire tread for cars in the rubber industry; understanding the friction and wear properties of tire tread rubber is important to improve the safety of the cars. This study aimed to investigate the tribological properties and wear mechanism of SBR under dry and wet conditions; an improved commercial block-on-ring...
In order to improve the elevated-temperature wear resistance of steels, an aluminized coating consisting of FeAl and Fe3Al was prepared on AISI H13 steel by hot-dip aluminizing and subsequently high-temperature diffusion. Dry sliding wear tests were conducted for the aluminized and uncoated AISI H13 steel against AISI M2 steel at room temperature and 600°C, respectively. Compared with the uncoated...
In order to improve its poor tribological performance, an oxidation/diffusion coating on Ti–6Al–4V alloy was prepared by thermal oxidation and subsequent vacuum diffusion. The wear characteristics of the coating were explored on a pin-on-disc high temperature wear tester under 50–300N at 25–600°C. The oxidation/diffusion coating with a thickness of 250μm was composed of TiO2, Ti2O and Ti2.5O3 and...
In this paper, spark plasma sintering is employed to synthesize a variety of self-lubricating ZrO 2 (Y 2 O 3 ) matrix composites by tailoring the chemical compositions. The additives of BaF 2 , CaF 2 , Ag, Ag 2 O, Cu 2 O, BaCrO 4 , BaSO 4 , SrSO 4 and CaSiO 3 were incorporated into the ceramic matrix to evaluate...
Experiments were performed on single crystal sapphire with a selection of bound abrasive cup tools to produce fine ground surfaces with rms roughness on the order of 1 μm. Both workpiece roughness and the ease of material removal (as quantified by Preston's coefficient or the specific grinding energy) were found to decrease with decreasing chip thickness. However, great variability was observed even...
In bound-abrasive grinding, the abrasive particles are subjected to normal and frictional forces due to their interactions with the workpiece. These forces generate stresses at the abrasive particle-matrix interface (also referred to as the interface in the following text). Debonding, or fallout of abrasive particles, will be affected by the stress state at the interface, which is determined by...
The wear behaviour of laser-clad TiC-Ni alloy coatings was studied by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and pin-on-ring friction and wear tests. TiC particles can act as hard barriers to resist the scoring and plastic deformation of the matrix and then delay the occurrence of delamination without distinctly increasing the friction coefficient of the...
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