Failure analysis and improvement measures of quenched and tempered crack on42CrMoA steel pin shaft

doi:10.13251/j.issn.0254-6051.2020.09.046

Abstract

Abstract: Causes of cracking of 42CrMoA steel pin shaft after quenching and tempering were analyzed by means of macroscopic and microscopic observation,chemical composition analysis,hardness test and microstructure test.The results show that the crack at the end thread hole of the pin shaft is due to quenching,which is mainly caused by unqualified raw material structure,too fast cooling rate of quenching medium and unreasonable structure design of parts.By optimizing the material,quenching medium and product structure,the quenching cracking of the pin shaft is avoided.

Key words: 42CrMoA steel, pin shaft, failure analysis, crack

CLC Number:

TG156.35

Jiang Qingbin, Zhang Zuozhi, Zhu Zhengwei, Zhou Yunjie. Failure analysis and improvement measures of quenched and tempered crack on42CrMoA steel pin shaft[J]. Heat Treatment of Metals, 2020, 45(9): 244-247.

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Failure analysis and improvement measures of quenched and tempered crack on42CrMoA steel pin shaft

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