Abstract: The effect of strain temperature and strain rate on critical deformation and dynamic recrystallization during single pass deformation at strain temperature between  1000 ℃ and  1100 ℃ and strain rate  1~10 s^-1 and the effect of strain temperature and inter-pass time on static recrystallization at temperature between 950 ℃ and 1050 ℃ and strain rate 10  s^-1 during  double  pass  rolling  of a  microalloyed  steel  Q345E:0.084C- 1.05Mn-0.026Nb-0.003Ti-0.007Mo-0.003V  have been studied by a Thermecmaster-Z thermal simulation machine. The test results showed that during single pass deformation the higher strain temperature was contributed to recrystallization of steel but the higher strain rate speeded up hardening of steel;during double pass deformation with prolonged inter-pass time and increased strain temperature,the static recrystallization percent increased.

Key words: Microalloyed Steel Containing Nb,Thermal Deformation Simulation,Stress-Strain Curve

摘要： 通过Thermecmaster-Z热模拟机研究了(%)0.084C-1.05Mn-0.026Nb-0.003Ti-0.007Mo-0.003V微合金钢Q345E,在变形温度1 000~1 100℃,变形速率1~10 s^-1时,单道次变形时变形温度和变形速度对临界应变和动态再结晶的影响,以及在变形温度950~1 050℃,变形速率10 s^-1双道次变形时变形温度和停留时间对静态再结晶的影响。试验结果表明,单道次变形时高的变形温度促进钢的再结晶,但高的变形速度加速钢的硬化;双道次变形时,停留时间延长和变形温度升高均增加静态再结晶百分率。

关键词: 含 Nb微合金化钢, 热变形模拟, 真应力-应变曲线