Circlip broke when installed in the hollow shaft of the rotor component.Macroscopic and microscopic morphologies on the fracture surface were observed,chemical composition of the raw material was tested,and the microstructure and hardness of the material were investigated in order to find out the failure mechanism of the circlip.The results show that the failure mode of the circlip is hydrogen embrittlement fracture.The circlip has a high sensitivity to hydrogen embrittlement due to its high hardness caused by low temperature tempering,and during electroplating,the accumulation of hydrogen inside the material increases,resulting in hydrogen embrittlement fracture during installation.Therefore,the heat treatment process of the circlip can be controlled to reduce the material hardness,meanwhile,the electroplating process can be controlled to reduce the thickness of the galvanized layer on the circlip.
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