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本文用对滚式接触疲劳机,试验研究了四种钢材化学热处理后的接触疲劳破坏过程及其与心部和渗层组织性能间的关系。结果表明:根据裂纹产生部位的不同,接触疲劳可分为深层剥落和浅层剥落两种形式。前者裂纹产生于过渡区,提高心部强度或增大渗层厚度可以延迟或阻止裂纹的产生,提高接触疲劳寿命;后者裂纹产生于渗层,改善渗层组织可以延迟或阻止裂纹的产生,提高接触疲劳寿命。此结论对齿轮的选择材料,制订热处理工艺和建立金相检验标准均有一定的参考价值。
In this paper, the contact fatigue failure process of the four kinds of steel after chemical heat treatment and the relationship between the contact fatigue failure and the microstructure and properties of the heart and the infiltrated layer were studied by using the roller contact fatigue machine. The results show that the contact fatigue can be divided into two types: deep peeling and shallow peeling according to the different crack initiation sites. The former cracks in the transition zone to improve the core strength or increase the thickness of the diffusion layer can delay or prevent the generation of cracks and improve the contact fatigue life; the latter cracks in the dissection, improve the dissemination of tissue can delay or stop the crack, Improve contact fatigue life. This conclusion has certain reference value for gear selection materials, development of heat treatment process and establishment of metallographic inspection standards.