论文部分内容阅读
一、概述接触疲劳是在反复接触应力作用下材料表层损伤积累和发展到破坏的过程,其破坏的主要形式是裂纹、麻点和剥落。接触表层的显微组织直接影响材料的接触疲劳寿命。同时,它在接触疲劳过程中要发生一定的变化。而这些组织变化又反过来影响材料的接触疲劳寿命。研究材料在接触疲劳过程中的显微组织变化及其对疲劳寿命的影响是接触疲劳的一个重要研究方面。A.B.Jones首先发现了在接触疲劳过程中显微组织的不稳定性,观察到在轴承内滚道的显微组织经化学侵蚀变黑,认为这是马氏体的热回火现象。后来J.J.Bush等人发现,只有当应力超过一定的门
First, an overview of contact fatigue is repeated contact stress under the surface damage accumulation and development to the destruction process, the main form of damage is crack, pitting and peeling. The contact surface microstructure directly affects the contact fatigue life of the material. At the same time, it is in the contact fatigue process to be some changes. These organizational changes in turn affect the contact fatigue life of materials. The study of microstructural changes in the contact fatigue process and its impact on fatigue life is an important aspect of contact fatigue. A.B.Jones first discovered the instability of the microstructure during contact fatigue and observed that the microstructure of the raceway in the bearing was blacked out chemically by chemical attack and thought to be a thermal tempering phenomenon of martensite. Later J.J.Bush et al found that only when the stress exceeds a certain threshold