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为了探究化学热处理工艺对轴承钢旋转弯曲疲劳性能的影响,本文利用旋转弯曲疲劳试验研究了低碳CrNiMoV轴承钢渗碳处理和复合硬化处理后的疲劳性能,分析了表面化学热处理后的组织、硬度分布、表面粗糙度和表面应力分布对旋转弯曲疲劳性能的影响。结果表明:复合硬化的表层存在厚度为4~6μm氮化物层和厚度为0.3 mm的碳氮化物层,表面的显微硬度为885 HV,比渗碳的要高93 HV;与单一渗碳相比,复合硬化后材料表面的残余压应力提高了102.59 MPa。复合硬化后的低碳CrNiMoV试验钢旋转弯曲疲劳性能明显优于单一渗碳。
In order to investigate the influence of chemical heat treatment process on the rotating bending fatigue properties of bearing steel, the fatigue behavior of low carbon CrNiMoV bearing steel after carburizing and composite hardening was studied by rotating bending fatigue test. The microstructure and hardness of the surface chemical heat treatment were analyzed. Effect of Distribution, Surface Roughness and Surface Stress Distribution on Rotational Bending Fatigue Properties. The results show that there are 4 ~ 6μm nitride layer and 0.3mm thick carbonitride layer on the hardened surface. The microhardness of the surface is 885 HV, 93 HV higher than that of carburizing. The residual compressive stress on the surface of composite material increased by 102.59 MPa after composite hardening. The composite hardened low carbon CrNiMoV test steel has significantly better flexural fatigue properties than single carburization.