Abstract In this work, the influence of different original microstructure on the rolling contact fatigue (RCF) property of D2 wheel steel under oil lubrication condition is thoroughly studied by the GPM-30 rolling fatigue tester. Before pre-wear, the RCF life of the tempered sorbite (TS) sample and the lamellar pearlite + proeutectoid ferrite (P + F) sample are 7.2 × 105cycles and 5.4 × 105 cycle, respectively. After pre-wear, the RCF life of the TS sample is 4 times higher than that of the original TS sample. However, the RCF life of the P + F sample is 4 times lower than that of the original P + F sample. After pre-wear, the formation of fatigue wear cracks at the P + F sample surface causes the flaking of hardening layer and acts as a crack initiation site to accelerate the RCF failure. While the hardening layer of the TS sample is not flaked. The formation of hardening layer and the decrease of surface roughness of the TS sample improve the RCF life. During the RCF crack propagation process, the ferrite grains are refined obviously at the edge of cracks due to huge internal stress on the inner wall of the RCF cracks. The thickness of refined ferrite grains of the TS sample at the edge of RCF cracks is higher than that of the P + F sample.

中文翻译：

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原始组织对D2车轮钢滚动接触疲劳性能的影响

摘要 本文采用GPM-30型滚动疲劳试验机，深入研究了不同原始显微组织对油润滑条件下D2车轮钢滚动接触疲劳(RCF)性能的影响。预磨损前，回火索氏体（TS）样品和层状珠光体+先共析铁素体（P+F）样品的RCF寿命分别为7.2×105cycles和5.4×105cycle。预磨损后，TS 样品的 RCF 寿命比原始 TS 样品高 4 倍。但是，P+F样品的RCF寿命比原来的P+F样品低4倍。预磨损后，P+F试样表面疲劳磨损裂纹的形成导致硬化层剥落，并作为裂纹萌生点加速RCF失效。而TS样品的硬化层没有剥落。硬化层的形成和TS样品表面粗糙度的降低提高了RCF寿命。在RCF裂纹扩展过程中，由于RCF裂纹内壁存在巨大的内应力，裂纹边缘的铁素体晶粒明显细化。TS试样在RCF裂纹边缘的细化铁素体晶粒厚度高于P+F试样。