Failure analysis of 38CrMoAlA steel driveshaft

doi:10.13251/j.issn.0254-6051.2021.09.048

Abstract

Abstract: Chemical composition, non-metallic inclusions, fracture crack morphology, microstructure and hardness of a failed 38CrMoAlA steel shaft were tested and observed by using spectrometer, Zeiss metallographic microscope and Rockwell hardness tester, and influencing factors of the workpiece crack were discussed. The results show that the chemical composition, hardness, nitriding layer, non-metallic inclusions, and band structure of the 38CrMoAlA steel shaft meet the standard requirements. But the microstructure of the shaft is bainite+pearlite, which is unexpected structure (tempered sorbite), and meantime, the grain is coarse. Therefore, the workpiece has high core hardness, large internal stress and brittleness, and it is easy to produce cracks under the action of stress, leading to brittle fracture failure.

Key words: 38CrMoAlA steel, shaft, microstructure, brittle fracture

CLC Number:

TG156.31

Xu Qihao,Yang Lilin, Xia Ming, Qin Chen, Geng Zhenyue, Jiang Yajun, Zhao Liping. Failure analysis of 38CrMoAlA steel driveshaft[J]. Heat Treatment of Metals, 2021, 46(9): 268-272.

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