Crack failure cause analysis of diesel engine crankshaft

doi:10.13251/j.issn.0254-6051.2021.10.050

Abstract

Abstract: Failure reason of cracks in a QT900-2 nodular cast iron diesel engine crankshaft was analyzed by means of chemical composition analysis, microstructure analysis, macro and micro morphology analysis of the cracks, hardened layer depth measurement and mechanical performance testing. The results show that the diesel engine is scratched first, resulting in the secondary quenching on the surface and re-tempering in the subsurface layer of the crankshaft, causing a large internal stress on the surface of the journal, which is the main reason for the induced crack failure, and the existence of carbides and looseness at surface layer is the internal factor of crack formation.

Key words: crankshaft, QT900-2 nodular cast iron, crack, structure, failure, bearing scratch

CLC Number:

TG164.2

Zhang Huaiqing, Yu Jinwen, Wang Qingquan, Fang Guijing, Guan Huihuan, Wang Yiming, Wei Cong. Crack failure cause analysis of diesel engine crankshaft[J]. Heat Treatment of Metals, 2021, 46(10): 270-274.

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