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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...
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...
Dry sliding wear tests of a titanium alloy against AISI 52100 steel as a tribo-pair were performed under 50–250N at 25–600°C. The wear characteristics of the titanium alloy and the counterface steel were investigated. The results showed that tribo-layers always existed on the worn surfaces of titanium alloy (pins) and steel (disks) in various test conditions. At 25–200°C, the titanium alloy presented...
High infrared emissivity coatings were prepared on 304 steel by pyrolyzing reactions with poly(hydridomethylsiloxane) (PHMS) and Al/HW powders. The microstructure, phase and chemical composition of the coatings were determined by SEM, XRD and EDS techniques. The infrared emissive properties at wavelength 3–20μm of the coatings pyrolyzed at 600 and 800°C on the steels were investigated. It was found...
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