Abstract A fine-grain layer is produced in high-speed train wheels after machining. In this article, the influence of the fine-grain layer on rolling contact fatigue (RCF) is studied using a GPM-30 fatigue tester. The results show that there is a 1-μm-thick fine-grain layer after grinding treatment. The fine-grain layer can improve the RCF life of wheel samples. The formation of RCF cracks on the sample with a fine-grain layer is divided into three stages: (1) the initiation of fine fatigue cracks is preferred in the fine-grain layer during RCF; (2) RCF cracks in the fine-grain layer propagate gradually to lead to flaking of the fine-grain layer; (3) when the fine-grain layer is flaked, RCF cracks initiate and propagate at the surface of the original microstructure. However, RCF cracks of the sample without a fine-grain layer directly initiate and propagate at the surface of the original microstructure. Therefore, the fine-grain layer can hinder the formation of RCF cracks at the surface of the original microstructure to improve RCF life.

中文翻译：

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不同加工工艺对D2车轮钢滚动接触疲劳寿命影响的试验研究

摘要 高速列车车轮加工后会产生细晶粒层。在本文中，使用 GPM-30 疲劳试验机研究细晶粒层对滚动接触疲劳 (RCF) 的影响。结果表明，研磨处理后存在1μm厚的细晶粒层。细晶粒层可以提高车轮样品的RCF寿命。细晶粒层试样上RCF裂纹的形成分为三个阶段：(1)细晶粒层在RCF过程中优先萌生细小疲劳裂纹；(2)细晶层RCF裂纹逐渐扩展，导致细晶层剥落；(3)当细晶粒层剥落时，RCF裂纹在原始显微组织表面萌生并扩展。然而，没有细晶粒层的样品的 RCF 裂纹直接在原始微观结构的表面开始和扩展。因此，细晶粒层可以阻碍原始显微组织表面RCF裂纹的形成，从而提高RCF寿命。