中文摘要：

采用热力模拟试验机Gleeble-3500对一种铸态含氮M2高速钢在0．01～1．0s。及1000～1100℃条件下进行热压缩变形，获得了铸态含氮M2高速钢的流变曲线并分析了变形后的显微组织特性。实验结果表明，铸态含氮M2高速钢热变形过程中的能量消耗效率随应变速率的升高而降低，流变失稳区随应变量的增加向低应变速率和低温区域转变，热变形激活能为588．733kJ／mol，同时得到了其热变形方程和热加工图，获得热加工最佳工艺窗口为0．01-1．0s-1和1050-1100℃。

英文摘要：

The hot compression deformation behavior of the as-cast AISI M2 high-speed steel containing nitrogen is investigated on the Gleeble-3500 simulator at a strain rate of 0.01-1.0 s-1 within the temperature range from 1 000 to 1 100℃. The flow curves are obtained and hot deformation microstructure is observed. The results show that the power dissipation efficiency decreases with strain rate, and the flow instability is extended to the lower strain rate and low temperature region with the increment of strain. The hot deformation activation energy of the steel is about 588.7 kJ/mol, and the hot deformation equation and processing map are obtained. The optimum processing window is offered showing the strain rate range of0.01～1.0 s-1 and the temperature range of 1 050- 1 100 ℃.