Study on the Correlation between Surface Integrity and Rolling Contact Fatigue Performance of Aviation Gear Steel
Gear rolling contact fatigue is an important bottleneck restricting the reliability,long life,and lightweight requirements of high-end equipment such as aviation,aerospace,new energy vehicles,and ships.Fatigue-resistant manufacturing is key to achieving high surface integrity and service performance.Revealing the relationship between high surface integrity,service life and fatigue limit has become a research focus in engineering and academia.The effects of conventional shot peening,dual shot peening,fine particle peening,barrel finishing,barrel finishing after shot peening,etc.on surface integrity and rolling contact fatigue properties of AISI 9310 carburized and quenched aviation gear steel are discussed.Active design method for contact fatigue resistance is proposed accordingly.This work is the second part of this series of studies,which aims to reveal the relationship between surface integrity and service performance by carrying out rolling contact fatigue tests with different manufacturing processes.The results show that under the contact stress state of 2 500 MPa,compared with the grinding state,the contact fatigue life could be increased by 75.7％,62.3％and 117％respectively by the dual shot peening,fine particle peening and barrel finishing.The rolling fatigue limit of samples treated by shot peening and shot peening-barrel finishing could reach 2 269 MPa and 2 553 MPa,respectively,which is 2.9％and 14.87％higher than that of the carburized grinding state.
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