Influence of shot peening on fatigue property of maraging ultra-high strength steel

doi:10.13251/j.issn.0254-6051.2020.02.050

Abstract

Abstract:

Fatigue property of a maraging ultra-high strength steel in solution treated and aged state was improved by shot peening. A rotating bending fatigue experiment of the specimens before and after shot peening was performed at stress ratio R=-1. Fatigue lives and fatigue limit at 1×10⁷ cycles were tested using the group method and staircase method, and the S-N curves were fitted with a double weighted least square method. Using X - ray diffraction to determine the residual stress of the shot peening samples, and combined with the results of finite element, the effect of residual stress on fatigue property of the ultra-high strength steel was studied. The results show that shot peening can significantly improve the fatigue life and fatigue limit of the ultra-high strength steel, and the fatigue limit after shot peening is 1.37 times higher than that of the unshot-peened specimens. The residual stress caused by shot peening makes the fatigue source far away from the surface, and the smaller the loading stress, the farther the distances of the fatigue source from the surface, and the effect of fatigue life improvement is more obvious.

Key words: shot peening, maraging ultra-high strength steel, fatigue property

CLC Number:

TG156.9

Kang Xia, Yin Guangqiang, Zhao Guiping. Influence of shot peening on fatigue property of maraging ultra-high strength steel[J]. HTM, 2020, 45(2): 253-256.

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