Material analysis of the fatigue mechanism of rollers in tapered roller bearings  

作　　者：GUO Wei CAO HongRui ZI YanYang HE ZhengJia 

机构地区：[1]State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University

出　　处：《Science China(Technological Sciences)》2018年第7期1003-1011,共9页中国科学（技术科学英文版）

基　　金：supported by National Natural Science Foundation of China(Grant No.51421004);Key Project supported by National Natural Science Foundation of China(Grant No.61633001)

摘　　要：Rolling contact fatigue is the main failure mechanism of tapered roller bearings. This study investigated the fatigue mechanism of rollers in a tapered roller bearing that failed in a run-to-failure test. Roller microstructure and crack morphology were investigated through scanning electron microscopy. A microhardness test was performed to investigate the strain hardening of the roller material induced by rolling contact fatigue. Results showed that microcavities and holes are important influential factors of crack initiation and propagation. Crack propagation angle affects crack morphology and propagation mode. Material strain hardening accelerates crack growth. Furthermore, roller misalignment causes uneven hardenability and severe damage to roller ends.

关 键 词：rolling contact fatigue mechanism crack propagation material microstructure roller misalignment 

分 类 号：TH133.33[机械工程—机械制造及自动化]