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| Influence of Nb and V on recrystallization of high-strength steel bars and design of rolling process |
| PU Chun-lei1,2, LIN Yin-he1,2, YIN Guo-liang3, TIAN Ye2, CHENG Xiang-kui2, FANG Shi-nian2 |
1. International Research Institute of Vanadium and Titanium, Panzhihua University, Panzhihua 617000, Sichuan, China;
2. Intelligent Development Department, MCC Huatian Engineering and Technology Corporation, Nanjing 210019, Jiangsu, China;
3. Chemistry and Chemical Engineering College, Yibin University, Yibin 644007, Sichuan, China |
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Abstract In order to study and design the quantitative control of the recrystallization behavior of the austenite region during the rolling process of high-strength steel bars after adding niobium and vanadium,the Gleeble-3500 thermal simulator was adopted to conduct uniaxial hot compression tests on niobium and vanadium microalloyed high-strength rebars. Based on the thermodynamic principle of the critical condition of recrystallization,the Avrami equation was used to obtain the recrystallization kinetic curve under different deformation conditions through the analysis of the stress-strain curve under different deformation conditions. And the niobium is quantitatively compared and analyzed according to the recrystallization kinetic curve. The effect of vanadium microalloying on the beginning,transformation,and end process of recrystallization of high-strength rebar was studied carefully. The results showed that the hot compression process of niobium and vanadium microalloyed rebars showed obvious characteristics of dynamic recrystallization. The addition of microalloying elements Nb/Nb+V hindered the dynamic recrystallization of 20MnSi steel and increased the deformation temperature. Or an increase in strain rate can promote recrystallization. Rolling Process design was carried out for the use of dynamic recrystallization and organization control in production. The calculations indicated cooling and recovery could be carried out before the finished stand in the finishing mill to ensure the recrystallization fraction(95%),where the temperature was around 830 ℃.
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Received: 16 March 2021
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2021, Vol. 56 
