ESP工艺下DP600热轧双相钢铁素体相变模型

Ferrite Phase Transformation Model of DP600 Hot Rolled Dual-Phase Steel Under ESP Process

为了建立ESP工艺条件下DP600热轧双相钢的铁素体相变动力学数学模型,采用动态相变膨胀仪对实验钢分别进行等温相变和连续冷却相变实验.基于实测的铁素体相变孕育期和铁素体体积分数,在变形温度以上结合经典形核理论计算铁素体相变孕育期,变形温度以下通过实验数据拟合△GV计算铁素体相变孕育期.考虑冷却速度的影响对可加性法则进行修正并基于此计算了连续冷却条件下的铁素体相变开始温度和体积分数.结果表明:修正后的相变模型计算的铁素体相变开始温度和体积分数与实测值吻合良好,可用于预测ESP工艺下DP600钢的铁素体相变行为.

In order to establish ferrite phase transformation kinetics mathematical model of DP600 hot rolled dual-phase steel under the ESP process condition,the isothermal phase transformation and continuous cooling phase transformation experiments were conducted on the experimental steel by using the dynamic phase transformation dilatometer.Based on the measured ferrite phase transformation incubation time and ferrite volume fraction,the incubation time of ferrite phase transformation was calculated by combining classical nucleation theory above the deformation temperature,and the incubation time of ferrite phase transformation below the deformation temperature was calculated by fitting∆GV according to the experimental data.Considering the influence of cooling rate,the additivity rule was modified and based on this,the starting temperature and volume fraction of ferrite phase transformation under continuous cooling conditions were calculated.The results showed that the calculated starting temperature and volume fraction of ferrite phase transformation using the modified phase transformation model are in good agreement with the measured values,which can be used to predict the ferrite phase transformation behavior of DP600 dual-phase steel under the ESP process.