Friction and wear performance of U76CrRE heavy rail steel under different post-rolling cooling modes

doi:10.13251/j.issn.0254-6051.2023.03.033

Abstract

Abstract: Taking U76CrRE heavy rail steel under different post-rolling cooling modes as the research object, the friction factor, wear amount, microstructure and wear-surface alloy element composition of the rail under water friction, dry friction and sand friction were analyzed by means of friction and wear tester, SEM (scanning electron microscope), EDX (energy dispersive spectrometer) and CLSM (laser confocal microscope). The results show that under same wear time, the average friction coefficient of air-blast-cooled specimen is smaller than that of air-cooled specimen, and the wear amount of air-blast-cooled specimen is much less than that of air-cooled specimen under sand friction. For the air-blast-cooled specimen, a small amount of scratches and peeling are formed after water friction, which are delamination wear; there are plough marks under dry friction and transverse cracks on the plough ridge, which are oxidized wear; and under sand friction, a large amount of wear debris appears and the most serious wear is abrasive wear. And the surface of the air-cooled specimen is flat and the pear groove is more obvious. The deformation layers of the air-blast-cooled specimens are all smaller than that of the air-cooled specimen, and the sand friction deformation layer is the largest. The U76CrRE heavy rail steel under air-blast-cooling has better wear resistance than that under air cooling.

Key words: U76CrRE heavy rail steel, post-rolling cooling, frictional wear, wearing capacity, friction coefficient

CLC Number:

TG142.1

Ji Chunjiao, Cen Yaodong, Zhang Liang, Chen Lin, Guo Yaohui. Friction and wear performance of U76CrRE heavy rail steel under different post-rolling cooling modes[J]. Heat Treatment of Metals, 2023, 48(3): 203-208.

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