Effect of grain size grade on rolling friction wear properties of high speed railway wheel steel

doi:10.13251/j.issn.0254-6051.2023.10.034

Abstract

Abstract: Rolling friction wear properties of ER8 high speed railway wheel steel specimens with three different grain size grades were comparatively investigated by using the GPM-30 rolling contact fatigue tester. The wear properties were evaluated by measuring the friction coefficient, calculating the wear rate and observing the wear morphologies. The results show that the higher the grain size grade of the specimen is, the lower the steady-state average friction factor is, and the lower the wear rate is. The steady state average friction factor of the specimen with grain size grade of 11.0 is 0.19, and the wear rate is 0.663×10^-5 g/m, while the steady state average friction factor of the specimens with grain size grades of 10.0 and 9.5 are 0.26 and 0.35 respectively, and the wear rate is 1.326×10^-5, 4.421×10^-5 g/m respectively. The surface severe spalling damage of the specimen with grain size grade of 9.5 is serious, and the wear rate is the highest. While the surface of the specimen with grain size grade of 11.0 is seriously oxidized after wear, where the oxide layer with a certain thickness is formed, which results in reduction of friction during the wear process, so that the friction factor of the specimen is smaller.

Key words: high speed rail wheel steel, rolling friction wear properties, grain size grade, friction factor, wear rate

CLC Number:

TG178

Ouyang Aiguo, Yu Bin, Hu Jun, Liu Yande. Effect of grain size grade on rolling friction wear properties of high speed railway wheel steel[J]. Heat Treatment of Metals, 2023, 48(10): 221-224.

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