Effect of Vanadium and Strain Rate on Hot Ductility of Low-Carbon Microalloyed Steels
Siying Song,
Junyu Tian,
Juan Xiao,
Lei Fan,
Yuebiao Yang,
Qinpan Yuan,
Xiaolong Gan,
Guang Xu
Affiliations
Siying Song
Hubei Collaborative Innovation Center for Advanced Steels, The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
Junyu Tian
Hubei Collaborative Innovation Center for Advanced Steels, The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
Juan Xiao
Guangxi Liuzhou Iron and Steel Group Co., Ltd., Liuzhou 545002, China
Lei Fan
Guangxi Liuzhou Iron and Steel Group Co., Ltd., Liuzhou 545002, China
Yuebiao Yang
Guangxi Liuzhou Iron and Steel Group Co., Ltd., Liuzhou 545002, China
Qinpan Yuan
Guangxi Liuzhou Iron and Steel Group Co., Ltd., Liuzhou 545002, China
Xiaolong Gan
Hubei Collaborative Innovation Center for Advanced Steels, The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
Guang Xu
Hubei Collaborative Innovation Center for Advanced Steels, The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
Hot tensile tests were conducted in this study to investigate the effect of strain rate (10−3 and 10 s−1) and vanadium content (0.029 and 0.047 wt.%) on the hot ductility of low-carbon microalloyed steels. The results indicate that a hot ductility trough appears at a low strain rate (10−3 s−1) because of the sufficient time for ferrite transformation and the growth of second particles, but it disappears at a high strain rate (10 s−1). The hot ductility is improved with the increase in strain rate at 700 °C or higher temperatures. In addition, with the increase in vanadium content, the large amounts of precipitate and increased ferrite transformation result in poor hot ductility of steels fractured at a low temperature range (600~900 °C). However, when the steel is fractured at a high temperature range (1000~1200 °C), more vanadium in the solid solution in the austenite inhibits the growth of parental austenite grains and results in grain refinement strengthening, slightly improving the hot ductility.
