Effect of Segregation and Contact Stress on Fatigue Wear Behavior of Bainitic Rail Steel

doi:10.3901/JME.2023.12.253

Abstract

Abstract: The fatigue wear failure mechanism of bainitic rail steel at different contact stress and the effect of composition segregation on fatigue wear performance were studied by using friction and wear testing machine, it provides theoretical basis for failure analysis and maintenance of new bainite rail. The results were presented that the failure mechanism of rail steel was dominated by wear at 800 MPa and 1 100 MPa contact stress. As the contact stress increased to 1 340 MPa, the failure mechanism of rail steel gradually changed from wear to fatigue mechanism. The quantitative analysis of segregation bands shows that segregation can improve the wear performance to a certain extent, but severely reduce the fatigue performance. It is found that the local hardness of the rail steel was improved by the fine microstructure and some martensite in segregation region. Thus, the wear property of samples with severe segregation was improved. The weight loss of severe segregation sample was about 14% less than the weight loss of slight segregation sample. Fatigue crack initiated and propagated along the segregation band, the crack length of the severe segregation sample was about 200% longer than the crack length of slight segregation sample. Therefore, the higher the segregation degree was, the worse the rolling contact fatigue property was.

Key words: segregation, rolling contact fatigue, wear, bainitic steel

CLC Number:

TG142

ZHANG Ruijie, ZHENG Chunlei, ZHANG Peijun, LIU Changbo, LÜ Bo, YANG Yongqiang, HAN Qingyang, ZHANG Fucheng. Effect of Segregation and Contact Stress on Fatigue Wear Behavior of Bainitic Rail Steel[J]. Journal of Mechanical Engineering, 2023, 59(12): 253-263.

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