低合金高强钢HSLA380再结晶温度的研究

通过对HSLA380钢进行不同条件下的退火试验，得出产线速度为100、200 m/min时HSLA380钢的再结晶温度曲线；采用阿弗拉米修正公式和阿伦尼乌斯公式预测了不同产线速度时该钢的再结晶温度T50，并对碳化物形貌进行了观察分析。结果表明：随着产线速度的提高，再结晶开始温度升高，再结晶激活能为54.55 kJ·mol-1，再结晶温度预测公式的误差率为7.5%；碳化物在奥氏体转变温度以下时弥散分布于基体中，在奥氏体转变温度以上时在晶界析出。

Research on recrystallization temperature of high strength low alloy steel of HSLA380

The recrystallization temperature curves of HSLA 380 steel were obained at different annealing conditions of 100 m/min and 200 m/min running speed.Using the Johnson-Mehl-Avrami（J-M-A）and Arrhenius formulas, the relationship between running speed and recrystallization temperature T50 was established,and the carbide morphology was analyzed.The results show that the recrystallization temperature will increase when running speed increasing,the recrystallization activation energy is 54.55 kJ·mol-1 and the rate of deviation for the recrystallization temperature prediction formula is 7.5%.Carbides are more concentrated in grain boundary above the austenite transformation temperature,or more diffused in the matrix below the austenite transformation temperature.