Ultrasonic surface rolling (USR), carburizing and the combined (Carburizing + USR) strengthening method were applied on the 20CrMoH steel, and the rolling contact fatigue (RCF) mechanisms of 20CrMoH steel subjected to different strengthening methods are analyzed. Results indicated that the combined strengthening method effectively increased the surface hardness value from 370 HV_0.2 to 900 HV_0.2, produced the highest residual compressive stress (RCS) value of −920 MPa and markedly reduced the surface roughness value to 0.48 μm. Under the Hertz contact stress of 2.02 GPa, the RCF life of the combined treated samples increased by 100% compared to the carburized samples, and the delamination mainly occurred. Surface roughness and RCS are important factors for anti-RCF failure.

对20CrMoH钢进行了超声表面滚压（USR）、渗碳和联合（渗碳+USR）强化方法，分析了20CrMoH钢在不同强化方法下的滚动接触疲劳（RCF）机理。结果表明，联合强化方法有效地将表面硬度值从370 HV _{0.2 提高}到900 HV _0.2，产生的最高残余压应力（RCS）值为-920 MPa，表面粗糙度值显着降低至0.48 μm。在 2.02 GPa 的赫兹接触应力下，组合处理样品的 RCF 寿命比渗碳样品提高 100%，主要发生分层。表面粗糙度和RCS是抗RCF失效的重要因素。