在渗剂中添加稀土,在42CrMo钢表面进行了等离子体氮碳共渗试验,并对渗层的组织形貌、显微硬度及接触疲劳强度进行了测试和分析,研究了稀土对等离子体氮碳共渗层的影响。结果表明,稀土在短时间内的催渗效果优于长时间,本次试验以低于8h的效果最为明显;稀土有细化晶粒,使渗层组织结合得更加致密的效果,还可提高次表层的显微硬度和接触疲劳强度。 The rare earth was added into the penetration agent, plasma nitrocarburizing was carried out on the surface of 42CrMo steel, and the microstructure and microhardness and contact fatigue strength were tested and analyzed. The effects of rare earth on plasma nitrogen Effect of carbon-diffusion layer. The results show that the rare earth in a short period of time is better than the long-term catastrophic permeation, the effect of this test is less than 8h most obvious; rare earth fine grain, so that the infiltration layer organization more dense effect, but also improve Subsurface microhardness and contact fatigue strength.