Abstract In this work, the effect of pre-wear under air condition on the rolling contact fatigue life (RCF) of D2 wheel steel under oil lubrication was thoroughly studied based on the rolling wear experiment. The results show that dry pre-wear can improve the RCF life of wheel sample under oil lubrication during RCF process before the sample surface forms the fatigue wear cracks during pre-wear process. Dry pre-wear can change largely pre-wear surface, such as increasing surface layer dislocation density, refining ferrite grains, dissolving lamellar cemetite in pearlite, forming fibrous microstructure and reducing surface roughness. These microstructural changes contribute to an improvement of the surface strength and RCF life of samples. However, when fatigue wear occurs on the contact surface during pre-wear process. The fatigue wear crack causes the flaking of hardening layer, and is a RCF crack source to accelerate the formation of the RCF crack. It can lead to reduce the RCF life of the sample.

中文翻译：

---

预磨损对D2车轮钢滚动接触疲劳性能的影响

摘要 本文基于滚动磨损实验，深入研究了空气条件下预磨损对油润滑下D2车轮钢滚动接触疲劳寿命（RCF）的影响。结果表明，在预磨损过程中，在样品表面形成疲劳磨损裂纹之前，干式预磨损可以提高RCF过程中油润滑下车轮样品的RCF寿命。干式预磨损可以在很大程度上改变预磨损表面，如增加表层位错密度，细化铁素体晶粒，在珠光体中溶解层状硅灰石，形成纤维状微观结构，降低表面粗糙度。这些微观结构的变化有助于提高样品的表面强度和 RCF 寿命。但是，在预磨损过程中接触面发生疲劳磨损时。疲劳磨损裂纹导致硬化层剥落，是加速RCF裂纹形成的RCF裂纹源。它会导致降低样品的 RCF 寿命。