Cracking analysis of 34CrNi3MoV steel transmission spindle  quenched and tempered

doi:10.13251/j.issn.0254-6051.2024.08.049

Abstract

Abstract: After quenching and tempering, a longitudinal quenching crack was detected on the outer circular surface of the 34CrNi3MoV steel transmission spindle during the semi precision turning process. The chemical composition, hardness gradient, microstructure near the crack source and quenching medium were detected, and the macroscopic morphology characteristics of the crack surface were analyzed. Metallurgical microscope, SEM and EDS characterizations were conducted on the cross section of crack surface. The results show that the contents of carbon and nickel elements in the transmission spindle exceed the upper limit of the standard range, resulting in inappropriate quenching and tempering process parameters. However, the presence of microcracks before quenching and tempering in the transmission spindle is the main factor leading to cracking failure.

Key words: 34CrNi3MoV steel, transmission spindle, failure analysis

CLC Number:

TG156.6

Li Ziyan, Xu Hongxiang, He Xiao, Liu Zhiqiang, Guo Jingqiang, Chen Shengchao, Lu Jinsheng. Cracking analysis of 34CrNi3MoV steel transmission spindle quenched and tempered[J]. Heat Treatment of Metals, 2024, 49(8): 295-300.

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Cracking analysis of 34CrNi3MoV steel transmission spindle quenched and tempered

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