Research on cracking mechanism of girth and weld straightening of grade 800 MPa automobile torsion beam steel

Li Yongliang; Kuang Shuang; Jia Lihui; Wang Yunhui; Chen Tong; Ju Weifeng; Zhang Yuwen; Zheng Yaxu

doi:10.7513/j.issn.1004-7638.2021.01.030

Volume 42 Issue 1

Feb. 2021

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Article Navigation > IRON STEEL VANADIUM TITANIUM > 2021 > 42(1): 184-190

Li Yongliang, Kuang Shuang, Jia Lihui, Wang Yunhui, Chen Tong, Ju Weifeng, Zhang Yuwen, Zheng Yaxu. Research on cracking mechanism of girth and weld straightening of grade 800 MPa automobile torsion beam steel[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(1): 184-190. doi: 10.7513/j.issn.1004-7638.2021.01.030

Citation:

Li Yongliang, Kuang Shuang, Jia Lihui, Wang Yunhui, Chen Tong, Ju Weifeng, Zhang Yuwen, Zheng Yaxu. Research on cracking mechanism of girth and weld straightening of grade 800 MPa automobile torsion beam steel[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(1): 184-190. doi: 10.7513/j.issn.1004-7638.2021.01.030

Citation:

Li Yongliang, Kuang Shuang, Jia Lihui, Wang Yunhui, Chen Tong, Ju Weifeng, Zhang Yuwen, Zheng Yaxu. Research on cracking mechanism of girth and weld straightening of grade 800 MPa automobile torsion beam steel[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(1): 184-190. doi: 10.7513/j.issn.1004-7638.2021.01.030

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Research on cracking mechanism of girth and weld straightening of grade 800 MPa automobile torsion beam steel

doi: 10.7513/j.issn.1004-7638.2021.01.030

1.
Tangshan Iron and Steel Group Co., Ltd., Tangshan 063016, Hebei, China
2.
Tangshan Stainless Steel Company, Tangshan 063100, Hebei, China
3.
School of Material Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, Hebei, China
4.
Hebei Key Laboratory of Material Near-net Forming Technology, Shijiazhuang 050018, Hebei , China

Received Date: 2020-08-18
Publish Date: 2021-02-10

Abstract

Abstract

The cracking mechanism of grade 800 MPa steel for automobile torsion beam during girth and weld straightening were studied by OM, SEM, TEM and EBSD. Thermos-Calc thermodynamic software and J Mat Pro software were used to calculate equilibrium precipitated phase in steel and TTT curves. The microstructure and nano precipitates of experimental steels with different compositions were observed. The results show that the main reasons for cracking of experimental steel during girth and weld straightening are as follows: the addition of Cr, Mo and V elements in the 3^#steel makes the TTT curve of the steel shift to the right, improving the stability of austenite and generating a large number of lath martensite and lath ferrite with high density dislocation during cooling after rolling. However, the amount of equiaxed ferrite is less and the grain size is uneven, so the tensile strength is higher. High density dislocation in lath martensite and lath ferrite results in the decrease of plasticity and toughness, and then causing crack in girth and weld during straightening.
- automobile torsion beam steel,
- Nb-Ti micro alloying steel,
- cracking mechanism,
- microstructure,
- nano precipitates

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References(20)

References

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