利用Gleeble-3500型热模拟试验机测定了60Si2Mn弹簧钢在不同条件下热变形时的真应力-真应变曲线, 讨论了其热变形抗力与变形温度、应变速率及真应变之间的关系, 并利用SPSS软件建立了数学模型。结果表明: 其它条件一定时, 试样的热变形抗力均随温度的升高而降低, 随着应变速率的增大而增大, 在应变速率为30 s-1时由于孪生变形使得曲线上出现锯齿形; 试样的热变形抗力随着真应变的增加而增大, 在真应变小于0.1时, 热变形抗力随应变的增大迅速增大, 此后, 热变形抗力增大的幅度降低, 曲线比较平缓; 建立的数学模型模拟值与实测值拟合良好。

True stress-true strain curves of 60Si2Mn spring steel under different deformation conditions were tested with Gleeble-3500 thermal simulation tester. It was discussed that the relationships of thermal deformation resistance with deformation temperature, strain rate and true strain, and the mathematical model was established with the SPSS software. The results show that the deformation resistance of the specimen decreased with increase of temperature when other conditions was fixed. With raising of the strain rate, the deformation resistance increased and sawtooth appeared on the curve for twinning when the strain rate was 30 s-1. The deformation resistance raised with increase of true strain, the deformation resistance raised rapidly with increase of strain when the true strain was smaller than 0.1, and then the deformation resistance rasied slowly and the curve was more gentle.The simulative value of mathemtical model agreed well with measured value.