Transactions of Materials and Heat Treatment

Title：Influence of heat treatment decarburization layer on fatigue performance for boron steel tubular torsion beam

Authors： Xu Xiaohua

Unit： Shanghai Baosteel High-tech Auto Parts Co. Ltd.

KeyWords： boron steel torsion beam heat treatment decarbonization layer fatigue performance

ClassificationCode：TG394

year,vol(issue):pagenumber：2021,46(4):235-240

Abstract：

For the problem of fatigue cracking for boron steel torsion beam, BR1500HS boron steel was made into torsion beam parts by tube making, pre-forming, hydroforming, heat treatment, sandblasting, laser cutting and other processes, and the fracture morphology, stress and strain, original austenite grain size and microstructure of torsion beam after fatigue cracking of parts during bench test were analyzed by the bench test measuring torsion fatigue performance. The results show that in the bench test of boron steel torsion beam, the positions with higher stress are all located at the V-shaped opening of torsion beam, and after heat treatment, the surface of boron steel torsion beam has a certain depth of decarburization layer, which affects the microhardness and the fatigue performance of parts significantly. Thus, by optimizing the heat treatment process and reducing the depth of decarburization layer, the fatigue performance of boron steel torsion beam is improved in the bench test.

Funds：

徐小华（1987-），男，硕士，工程师 E-mail：xuxiaohua@baosteel.com

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