Fracture cause analysis of 30CrMnSiA steel bolt for motor fixing

doi:10.13251/j.issn.0254-6051.2021.05.044

Abstract

Abstract: A 30CrMnSiA steel bolt for fixing a motor was fractured in service. The fracture cause was analyzed through load analysis, bolt appearance and fracture morphology observation, microstructure examination, chemical composition analysis and hardness measurement. The results show that the fracture is fatigue type, the machining damage nearby the thread root is the source of fatigue crack, and the decarburization on the bolt surface accelerates the fatigue fracture.

Key words: 30CrMnSiA steel, bolt, fracture analysis, fatigue fracture, decarburization

CLC Number:

TG142.33

Huang Xin, Zhou Jiguang, Fang Zhixiao, Wu Wei, Wen Yonghong. Fracture cause analysis of 30CrMnSiA steel bolt for motor fixing[J]. Heat Treatment of Metals, 2021, 46(5): 253-258.

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