Abstract: The hot deformation behavior of 00Ci26Mo4 super ferritic stainless steel is studied by the isothermal compression of cylindrical specimens at 1050 ~ 1250°C with the strain rate of 0. 1 ~ 10 s" high temperature compress experiment on Gleeble-3500 simulated machine. By the thermo mechanical parameters of steel simulated by using power function/ exponential function/hyperbolic sine mathematics model, the corresponding hot deformation constitutive is established. The results show that in hot compression process the flow stress decreases with the increase of deformation temperature and in¬creases with the increase of strain rate, and there is no well-defined peak stress in the flow-stress curves. The softening mechanism of 00Cr26Mo4 steel is only dynamic recovery. The constitutive correlation of power fiinction/exponential function/hyperbolic sine mathematics model with 00Cr26Mo4 steel is studied, the results show that the hyperbolic sine mathematics model accords with the rules of the flow stress strain curve of 00Cr26Mo4 super ferritic stainless steel, and using hyperbolic sine mathematics model the 00Cr26Mo4 constitutive equation is established, to get the calculated activation energy of deformation 238. 836 kJ/mol.

摘要： 在Gleeble-3500热模拟试验机上进行高温压缩实验,研究00Cr26Mo4超级铁素体不锈钢在变形温度为1050～1250℃、应变速率为0.01～10 S^-1条件下的热变形行为。采用幂函数、指数函数和双曲正弦模型模拟该材料的热变形参数,建立了相应的热变形本构方程。结果表明,在热压缩过程中,流变应力随变形温度的升高而降低,随应变速率的升高而增加,流变应力并未出现明显峰值,材料的软化机制仅有动态回复。探究了幂函数、指数函数和双曲线函数3种模型与00Cr26Mo4钢本构关系的相关性。结果表明,双曲正弦函数模型更符合00Cr26Mo4超级铁素体不锈钢热加工流变应力应变曲线变化规律,并基于双曲正弦函数模型建立了00Cr26Mo4钢的本构方程,计算了热变形激活能238.836 kJ/mol。