M35高速钢的热变形行为研究

Hot deformation behaviors of M35 high speed steel

在Gleeble-1500热模拟试验机上对M35高速钢进行了热压缩试验,研究了变形温度在950~1150℃、变形速率为0.01~10s^(-1)时M35高速钢的热变形行为,建立了热变形本构方程和热加工图。结果表明:M35高速钢热压缩过程中的变形行为可用双曲正弦函数来表征,其平均变形激活能为333.04kJ·mol^(-1)。通过热加工图直观地展现出了M35高速钢热变形失稳的区域,并且获得了实验条件下其热变形过程的最优工艺制度,即热加工温度为1 100℃,应变速率为0.01s^(-1)。

The hot deformation behavior of M35 high speed steel was investigated by hot tensile test with Gleeble-1500 thermal simulator system with the deformation temperature ranging from 950 ℃ to 1 150 ℃ and strain rates between 0. 01 s-1 and 10 s-1 , and the thermal deformation constitutive equation and the thermal processing map were established. The results show that the rheological behavior of M35 high speed steel during hot deformation can be described by hyperbolic sine function and its average deformation activation energy is 333.04kJ ·mol-1. The theological instability region of the thermal deformation is determined by the thermal processing map, and the optimum regulation of the thermal deformation process is obtained, namely the deformation temperature is 1100 ℃ and the strain rate is 0.01 s-1.