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采用Gleeble-1 5 0 0热力模拟机测定了变形速率为1 s-1、1 0 s-1和2 0 s-1,变形程度75%,变形温度为1 200℃、1 100℃、1 000℃、900℃及800℃时硅锰系TRIP钢的应力-应变曲线。应用SPASS软件对TRIP钢变形抗力实验结果进行拟合,并模拟了变形条件对变形抗力的影响,得到数学模型公式。计算平均绝对误差均小于5 MPa,平均相对误差小于5%,最大绝对误差小于10 MPa,最大相对误差小于15%,误差均较小,计算结果属于允许范围。结果证明:真应变大于0.4应力基本稳定;变形温度低于1 100℃时,加工硬化比较明显,表明温度越低,加工硬化率越高。
The deformation rate was 1 s-1,1 0 s-1 and 20 s-1, the deformation degree was 75%, the deformation temperature was 1 200 ℃, 1 100 ℃ and 1 000 were measured by Gleeble-1500 thermal simulator Stress-strain curves of Si-Mn-based TRIP steels at 900, 800, and 800 ℃. The experimental results of deformation resistance of TRIP steel were fitted by using SPASS software and the influence of deformation conditions on deformation resistance was simulated. The formula of mathematical model was obtained. The calculated average absolute error is less than 5 MPa, the average relative error is less than 5%, the maximum absolute error is less than 10 MPa, the maximum relative error is less than 15%, and the error is small. The calculation result belongs to the allowable range. The results show that: true strain greater than 0.4 basically stable stress; deformation temperature is lower than 1 100 ℃, the work hardening is obvious, indicating that the lower the temperature, the higher the work hardening rate.