Cracking failure analysis on high-speed intermediate shaft gear

doi:10.13251/j.issn.0254-6051.2023.07.048

Abstract

Abstract: A 18CrNiMo7-6 steel high speed intermediate shaft gear of gearbox had abnormal vibration sound during the dynamic balance test after carburizing and quenching. After disassembly, it was found that the intermediate shaft gear had obvious axial crack at the axial diameter. After macro observation and multiple cutting, it was found that the crack source was located at the axle center of the large gear. The crack location of the main shaft was studied by chemical composition analysis and microstructure analysis. The results show that due to the incomplete dehydrogenation treatment of the large billet forgings, the hydrogen atoms gather to form hydrogen molecules over time, which causes the stress concentration inside the workpiece, leading to the delayed hydrogen embrittlement cracking of the gear shaft after carburizing and quenching, and resulting in the failure of the shaft gear.

Key words: high speed shaft gear, 18CrNiMo7-6 steel, cracking, hydrogen embrittlement, failure analysis

CLC Number:

Chen Shengchao, Chen Yesheng, Rong Zeyu, Wang Hongwei, Xu Hongxiang, Zhao Shaofu, Guo Jingqiang. Cracking failure analysis on high-speed intermediate shaft gear[J]. Heat Treatment of Metals, 2023, 48(7): 287-291.

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