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1050～1100℃,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.
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.
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