汽车用IF钢连铸坯第Ⅲ脆性区及其形成机理分析

doi:10.11896/cldb.22100112

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Abstract Exploring the third brittle region of continuous casting slab and its mechanism plays an important guiding role in avoiding slab cracks and effectively regulating slab properties. The high-temperature mechanical properties of interstitial-free steel (IF) slab for automobiles have been studied by using Gleeble thermal/mechanical simulation testing machine. Combined with thermal expansion test and microstructure analysis, the formation mechanism of the third brittle region of IF steel slab has been explored. The results show that the IF steel has excellent thermoplasticity, the temperature range of the third brittle region is 850—950 ℃, the second cooling low ductility zone is 875—925 ℃, and the tensile strength and yield strength above 1 250 ℃ are lower than 30 MPa and 20 MPa, respectively. From the perspective of deformation and stress, the temperature of the straightening zone should be controlled between 950 and 1 250 ℃. The content of the second phase reaches the highest level around 950 ℃, which is mainly composed of a large amount of micron-sized TiN and a small amount of composite second phases of TiN and MnS, which lead to a decrease in thermoplasticity. This combined effect, which a large number of micron-sized second phases, deformation-induced ferrite near the A_e3 temperature, and austenite decomposition in the A_ff—A_r3 temperature range, is the root cause of the third brittle region of the IF steel slab. The IF steel second cooling low ductility zones under different cooling rates can be calculated according to T_α^40%(C_R)—A_e3.

Key words： IF steel the third brittle region second phase austenite decomposition phase fraction thermoplasticity

Published: 25 July 2024 Online: 2024-08-12

CLC number:	TG142.1
	TF777

Fund:National Natural Science Foundation of China (51874059).

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	Articles by authors
	AI Songyuan
	WANG Kai
	LONG Mujun
	ZHANG Haohao
	CHEN Dengfu
	DUAN Huamei

Cite this article:

AI Songyuan,WANG Kai,LONG Mujun, et al. The Third Brittle Region and Its Mechanism Analysis of IF Steel Slab Used in Automobile[J]. Materials Reports, 2024, 38(14): 22100112-7.

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http://www.mater-rep.com/EN/10.11896/cldb.22100112 OR http://www.mater-rep.com/EN/Y2024/V38/I14/22100112

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