新型二次硬化渗碳钢的高温塑性及热加工图

 利用Gleeble-3800热模拟试验机，对一种新型二次硬化渗碳钢C61进行了高温轴向压缩试验，测得其高温流变曲线，观察了高温变形后的显微组织，获得了该钢的热变形激活能Q]为414.84 kJ/mol，建立了试验钢的热变形本构方程，并绘制了其热加工图。结合高温变形后的显微组织和热加工图，确定最优热变形工艺参数为变形温度范围为1 050～1 100 ℃，应变速率范围为0.1～1.0 s－1，此时试验钢组织发生了完全动态再结晶，晶粒明显细化，且对应的能量耗散效率达到峰值。

Hot ductility and processing maps of a new secondary hardening carburized steel

The hot temperature compression behaviors of a new secondary hardening carburized steel-C61 was imple-mented using Gleeble-3800 thermal simulation testing machine. The high temperature flow curve was determined and the microstructures were observed. The activation energy Q of thermal deformation of the testing steel was 414.84 kJ/mol. The thermal deformation equation and the hot processing map were established. The optimal thermal deformation pro-cessing parameters were determined combined with microstructures after high temperature deformation and the hot pro-cessing map. The region of the best thermal deformation temperature ranged from 1050 to 1100℃and strain rates from 0.1 to 1.0 s-1. The behavior of completely dynamic recrystallization could be observed,the grains were refined obvious-ly,and the corresponding energy dissipation efficiency reached the peak.