Analysis of microstructure and fatigue performance of carburizing bearing steel

作者：Li Dan; Yang Mao Sheng; Cao Jian Chun^*; Zhou Xiao Long; Jia Yu Ze

来源：Transactions of Materials and Heat Treatment, 2014, 35(6): 137-141.

• Bearing steels
• Fatigue cracks
• Fatigue limit stress
• Fatigue performance
• High cycle fatigue
• Non-metallic inclusions
• Residual austenite
• Stress condition

The high cycle fatigue performance of carburizing bearing steel which was used in the field of aviation under symmetrical cycle stress condition was investigated by using rotating-bending fatigue testing machine. The S-N curves and fatigue up-down graph were obtained. The fatigue limit stress was calculated. Utilization of OM, the microstructure of carburized layer consists of crystal martensite, residual austenite and a few carbides, the microstructure of the center is lath martensite, a few residual austenite and a lot of carbides. The fatigue crack feature was analyzed by observing crack profile under SEM. The study of fatigue crack reveals that most of the fatigue cracks initiates at surface or sub-surface non-metallic inclusions of composite oxide, and then crack growth results in fracture eventually.

• 出版日期2014
• 单位武汉科技大学