车身用22MnB5超高强热成形钢的热变形行为及热加工图

doi:10.11896/cldb.22030170

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Abstract To determine the hot forming processes of 22MnB5 boron steel, hot tensile tests were carried out at temperatures of 773—1 223 K and strain rates of 0.01—10 s^-1 using Gleeble-1500D thermal simulation machine. The results show that the studied steel shows strong positive strain rate sensitivity, and its peak stress decreases with the increase of deformation temperature. Except for that deformed at 0.01 s^-1 and 773 K, the flow stress increases gradually with the increase of applied strain, and then tends to be stable when it reaches the peak stress. The mechanical constitutive equation of the studied steel is established based on the Arrhenius hyperbolic sine function model, and the activation energy Q of thermal deformation at peak stress is determined (26.54—53.77 kJ/mol). The Q first increases followed by decrease with the increase of applied strain rate, and decreases followed by increase with the increase of deformation temperature. The hot working map of the studied boron steel with peak stress is constructed based on the dynamic material model, and the hot forming microstructure is closely related to deformation temperature and strain rate. Based on the above analysis, the hot working process of the studied boron steel is confirmed: forming temperature 988—1 058 K, strain rate 0.01—0.1 s^-1; forming temperature 1 143—1 223 K, strain rate 0.01—0.02 s^-1.

Key words： 22MnB5 boron steel hot deformation behavior hot processing map microstructure

Published: 25 September 2023 Online: 2023-09-18

CLC number:

TG306

Fund:National Natural Science Foundation of China (U20A20275), the Research Foundation of Education Bureau of Hunan Province (18B193), and Research and Innovation Program for Postgraduates in Hunan Province (CX20220734).

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	Articles by authors
	TANG Qian
	GUO Pengcheng
	LUO Hong
	MA Honghao
	ZHANG Liqiang
	LI Luoxing

Cite this article:

TANG Qian,GUO Pengcheng,LUO Hong, et al. Hot Deformation Behavior and Hot Processing Map of Hot-formed 22MnB5 Ultra-high Strength Steel for Automobile Body[J]. Materials Reports, 2023, 37(18): 22030170-7.

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http://www.mater-rep.com/EN/10.11896/cldb.22030170 OR http://www.mater-rep.com/EN/Y2023/V37/I18/22030170

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