Study on microstructure evolution and austenitizing process of 1800 MPa grade ultra-high strength hot stamping steels

Liu Shuang; Chen Huiqin; Cao Miao; Che Xin; Yang Fan; Feng Yi

doi:10.7513/j.issn.1004-7638.2023.06.019

Volume 44 Issue 6

Dec. 2023

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Liu Shuang, Chen Huiqin, Cao Miao, Che Xin, Yang Fan, Feng Yi. Study on microstructure evolution and austenitizing process of 1800 MPa grade ultra-high strength hot stamping steels[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(6): 133-138. doi: 10.7513/j.issn.1004-7638.2023.06.019

Citation:

Liu Shuang, Chen Huiqin, Cao Miao, Che Xin, Yang Fan, Feng Yi. Study on microstructure evolution and austenitizing process of 1800 MPa grade ultra-high strength hot stamping steels[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(6): 133-138. doi: 10.7513/j.issn.1004-7638.2023.06.019

Citation:

Liu Shuang, Chen Huiqin, Cao Miao, Che Xin, Yang Fan, Feng Yi. Study on microstructure evolution and austenitizing process of 1800 MPa grade ultra-high strength hot stamping steels[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(6): 133-138. doi: 10.7513/j.issn.1004-7638.2023.06.019

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Study on microstructure evolution and austenitizing process of 1800 MPa grade ultra-high strength hot stamping steels

doi: 10.7513/j.issn.1004-7638.2023.06.019

1.
School of Meterials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, Shanxi , China
2.
China Automotive Engineering Research Institute Co.,Ltd., Chongqing 401122, China

Received Date: 2022-09-08
Available Online: 2024-01-11
Publish Date: 2023-12-30

Abstract

Abstract

The evolution of microstructures and properties of 1800 MPa ultra-high strength hot stamping steels under different austenitizing temperatures and holding times were experimentally studied in this paper, and the optimum hot stamping austenitizing process was established. The results show that when the austenitizing temperature and holding time reach 840 ℃ and 3 min, respectively, the quenched microstructures of the hot stamping steel is consisted of martensite, and the martensite becomes coarser with the increase in temperature and holding time. The tensile strength decreases gradually with the increase of the austenitizing temperature and holding time. When the austenitizing temperature is 840 ℃, the tensile strength, elongation and strength-ductility product can reach 1861.3 MPa, 6.88% and 12.81 GPa·%, respectively. When the holding time is 3 min, the tensile strength, elongation and strength-ductility product can reach 1851.28 MPa, 6.84% and 12.66 GPa·%, respectively. The austenitizing temperature of 840 ℃ and holding time of 3 min are selected as the optimum austenitizing parameters.
- ultra-high strength hot stamping steel,
- austenitizing process,
- microstructures,
- properties

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References(15)

References

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