Cause analysis of crack formation of 38CrMoAl round steel bar after quenching and tempering

doi:10.13251/j.issn.0254-6051.2023.02.047

Abstract

Abstract: Cracks occurred after quenching and tempering in 38CrMoAl steel bar produced in a domestic steel mill, the crack was sampled, and the cause of cracks was investigated by means of chemical composition, macroscopic detection, microstructure analysis, scanning electron microscopy analysis, etc. The results show that the cracks are induced during quenching. The main reason for this is the presence of metallurgical defects including shrinkage, spot segregation, etc. in the original material round billet, while the effect of structural stress and thermal stress during the quenching and tempering promotes the propagation of the crack.

Key words: 38CrMoAl round steel, quenching crack, defect, segregation

CLC Number:

TG142.15

Tan Ruisong, Huang Yan, Song Bo, Zuo Xiaotan, Zhu Libin, Liu Wei, Yang Shufeng. Cause analysis of crack formation of 38CrMoAl round steel bar after quenching and tempering[J]. Heat Treatment of Metals, 2023, 48(2): 303-307.

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