Effect of V–Ti Addition on Microstructure Evolution and Mechanical Properties of Hot-Rolled Transformation-Induced Plasticity Steel
来源期刊：Acta Metallurgica Sinica2019年第3期
论文作者：Hai-Cun Yu Zhao-Zhen Cai Gui-Qin Fu Miao-Yong Zhu
文章页码：352 - 360
摘 要：In order to reveal the effect of V–Ti addition on the microstructure evolution and the mechanical properties of hot-rolled transformation-induced plasticity（TRIP） steel, two steels with 0.072 V–0.051 Ti steel（Bear-V–Ti steel） and 0.001 V–0.001 Ti steel（Free-V–Ti steel） were designed, respectively, and the comparison analyses were carried out by performing thermodynamic calculation and an experiment. With the thermodynamic calculation, the critical annealing temperature of a large fraction of retained austenite（～51%） obtained via solute enrichment was determined, and an optimized quenching at 650 °C and tempering at 200 °C adopted on the as-hot-rolled steel. The results show that the V–Ti TRIP steel displays more optimum mechanical stability during the tensile deformation, since the fraction and the mechanical stability of retained austenite are improved and the microstructure is also ultrarefined by V–Ti alloy precipitation. The yield strength of Bear-V–Ti steel increases from 650 to 800 MPa, and the ductility reaches 37%, showing that the comprehensive mechanical properties are greatly improved.
Hai-Cun Yu，Zhao-Zhen Cai，Gui-Qin Fu，Miao-Yong Zhu
School of Metallurgy, Northeastern University
摘 要：In order to reveal the effect of V–Ti addition on the microstructure evolution and the mechanical properties of hot-rolled transformation-induced plasticity（TRIP） steel, two steels with 0.072 V–0.051 Ti steel（Bear-V–Ti steel） and 0.001 V–0.001 Ti steel（Free-V–Ti steel） were designed, respectively, and the comparison analyses were carried out by performing thermodynamic calculation and an experiment. With the thermodynamic calculation, the critical annealing temperature of a large fraction of retained austenite（～51%） obtained via solute enrichment was determined, and an optimized quenching at 650 °C and tempering at 200 °C adopted on the as-hot-rolled steel. The results show that the V–Ti TRIP steel displays more optimum mechanical stability during the tensile deformation, since the fraction and the mechanical stability of retained austenite are improved and the microstructure is also ultrarefined by V–Ti alloy precipitation. The yield strength of Bear-V–Ti steel increases from 650 to 800 MPa, and the ductility reaches 37%, showing that the comprehensive mechanical properties are greatly improved.
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