Hot Deformation Behavior of V-Microalloyed Steel

• Published in: Journal of iron and steel research, international Vol. 17; no. 8; pp. 55 - 60
• Main Authors: REN, An-chao, JI, Yu, ZHOU, Gui-feng, YUAN, Ze-xi, HAN, Bin, LI, Yi
• Format: Journal Article
• Language: English
• Published: Singapore Elsevier Ltd 01.08.2010; Springer Singapore
• Subjects: Applied and Technical Physics; continuous cooling transformation curve; Cooling rate; Deformation; deformation temperature; Engineering; Iron and steel industry; Machines; Manufacturing; Materials Engineering; Materials Science; Metallic Materials; Physical Chemistry; Processes; Recrystallization; Relaxation time; static recrystallization; Steel making; Structural steels; thermal simulation; Transformations; U75V rail steel; 冷却速度; 压缩试验; 变形温度; 奥氏体转变; 弛豫时间; 微合金化钢; 热变形行为; 连续冷却转变曲线; static recrystallization; U75V rail steel; thermal simulation; deformation temperature; continuous cooling transformation curve
• ISSN: 1006-706X; 2210-3988
• DOI: 10.1016/S1006-706X(10)60129-X

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 double-pass compression test.The results show that the product of austenite transformation is pearlite when the cooling rate is lower than 10 ℃.When the cooling rate was in the range of 10-50 ℃·s-1,only martensite was received.The 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.