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 Ae3 temperature, and austenite decomposition in the Aff—Ar3 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 Tα40%(CR)—Ae3.
艾松元, 王凯, 龙木军, 张浩浩, 陈登福, 段华美. 汽车用IF钢连铸坯第Ⅲ脆性区及其形成机理分析[J]. 材料导报, 2024, 38(14): 22100112-7.
AI Songyuan, WANG Kai, LONG Mujun, ZHANG Haohao, CHEN Dengfu, DUAN Huamei. The Third Brittle Region and Its Mechanism Analysis of IF Steel Slab Used in Automobile. Materials Reports, 2024, 38(14): 22100112-7.
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2024, Vol. 38 
