Thermal Deformation Resistance of 60Si2Mn Spring Steel and Its Mathematical Model

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.