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Hot Deformation Behavior of V-Microalloyed Steel
Authors:REN An-chao  JI Yu  ZHOU Gui-feng  YUAN Ze-xi  HAN Bin  LI Yi
Affiliation:1. Institute of Material Science and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081,Hubei, China;Research and Development Center, Wuhan Iron and Steel Group Co, Wuhan 430080, Hubei,China
2. Research and Development Center, Wuhan Iron and Steel Group Co, Wuhan 430080, Hubei,China
3. Institute of Material Science and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081,Hubei, China
4. International Trade Company, Wuhan Iron and Steel Group Co, Wuhan 430080, Hubei, China
Abstract:Through the expansion curve of continuous cooling transformation at different cooling rates measured by THERMECMASTOR-Z thermal simulator for U75V rail steel, the continuous cooling transformation curve was obtained. The influence on steel microstructure and hardness at different cooling rates was studied. The softening behavior of isothermal deforming in austenite area of 850- 1000 ℃ in the interval of passes was also studied by doublepass compression test. The results show that the product of austenite transformation is pearlite when the cooling rate hardness of the test steel increases with increasing the cooling rate. Under the condition of deformation of 30% and deformation rate of 3 s-1 , the relaxation time for complete recrystallization was shorter than 100 s when deformation temperature was higher than 1000 ℃. When deformation temperature was lower than 880 ℃, complete recrystallization of steel was difficult to achieve even if the relaxation time is extended.
Keywords:V Microalloyed High Carbon Steel  thermal simulation  continuous cooling transformation curve  deformation temperature  static recrystallization
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