Failure analysis of 30CrMnSiA steel countersunk bolt

doi:10.13251/j.issn.0254-6051.2021.03.043

Abstract

Abstract: A 30CrMnSiA steel countersunk bolt used in an aircraft breaks during disassembly, and cracks were also found in the same batch of unused bolts detected by magnetic powder. In order to find out the cause of failure analysis, the broken and cracked bolts were analyzed by means of appearance inspection, macro-microscopic analysis of fracture surface, energy spectrum analysis, hardness test and metallographic analysis. The results show that the fracture type of broken and cracked bolts is hydrogen embrittlement. The hydrogen embrittlement fracture of bolt is mainly related to tensile strength and heat treatment process. By improving the heat treatment process parameters, the strength of bolt is appropriately reduced and the hydrogen content is reduced by increasing the hydrogen removal time after pickling. Thus the possibility of hydrogen embrittlement is avoided.

Key words: 30CrMnSiA steel, countersunk bolt, hydrogen embrittlement, fracture, failure analysis

CLC Number:

TG115

Yu Haihua, Yan Haiyan, Zhang Jingtong, Wang Yukui, Huang Zhiyong, Wu Jianxin, Wei Zhenwei. Failure analysis of 30CrMnSiA steel countersunk bolt[J]. Heat Treatment of Metals, 2021, 46(3): 223-228.

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