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Xia, Bo; Wang, Bin; Zhang, Peng; Ren, Chuanxi; Duan, Qiqiang; Li, Xiaowu; Zhang, Zhefeng
International journal of fatigue, August 2022, 2022-08-00, 20220801, Letnik: 161Journal Article
•The effect of SP with different intensities on HCF life of a spring steel with various strength is revealed.•SP treatment can deteriorate the HCF life of the spring steel with lower strength.•SP treatment is beneficial to the improvement in HCF life of the spring steel with higher strength.•Increasing SP intensity is not beneficial to the further improvement in HCF life of HT specimens.•A new parameter, Rsp-HCF, is defined to analyze the effect of SP on the fatigue property of a spring steel. Shot peening (SP) treatment is a common and useful method that can affect the fatigue life of metallic components. In this work, the high-cycle fatigue (HCF) lives of 50CrMnMoVNb spring steels with different SP intensities and conditions were investigated. Meanwhile, the differences in the microstructures and crack initiation sites were compared. The fatigue life of the investigated steels is greatly improved via suitable heat treatment. Furthermore, SP treatment is beneficial to the improvement of the fatigue life of heat-treated specimens with higher strength, and the optimal SP intensity is 0.15 ∼ 0.25 mmA. However, SP deteriorates the HCF life of the as-received specimens with lower strength. This study can enrich the fundamental knowledge on how to improve the HCF life of spring steels and provide new ideas about the influence of different SP intensities on the surface layer and fatigue properties.
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