本文讨论了接触疲劳试验的方法,确定了试件接触疲劳失效的指标。研究了表面强化层硬度分布、表面薄层软化处理、滑动此等因素对接触疲劳强度的影响。对于表面强化试件,并对其宏观和电镜断口、剖面裂纹及剥落层深度等进行了接触疲劳裂纹的产生和发展过程的观察和分析。试验表明疲劳裂纹是从内部产生的,与最大切应力理论是一致的。可见增加表层强化层的厚度,提高心部和过渡区的强度可提高机件的接触疲劳寿命。此外,本文并根据本试验结果和有关资料讨论了提高机件接触疲劳抗力的途径。 This article discusses the contact fatigue test method to determine the specimen fatigue failure index. The effects of surface hardness, surface softening and sliding on the contact fatigue strength were studied. For the surface strengthened specimens, the occurrence and development of contact fatigue cracks were observed and analyzed for the macroscopic and SEM images, cross-sectional cracks and the peel depth. Tests show that fatigue cracks are generated internally and are consistent with the theory of maximum shear stress. Can be seen to increase the thickness of the surface layer to enhance the strength of the heart and the transition zone can improve the contact fatigue life of mechanical parts. In addition, this paper discusses the ways to improve the contact fatigue resistance of the machine parts based on the test results and relevant data.