在Gleeble-1500D热模拟试验机上采用等温压缩试验研究了高锰奥氏体Fe-25Mn-3Si-3Al TWIP钢在变形温度为900~1100℃，变形速率为0.01~1s-1条件下的热变形行为。研究结果表明，Fe-25Mn-3Si-3Al钢热变形流变应力曲线呈现明显的动态再结晶特征，出现了一个明显的流变应力峰值，峰值之后流变应力逐渐降低，呈现稳态流变。双曲正弦形式的Arrhenius方程可以较好地描述Fe-25Mn-3Si-3Al钢的热变形行为，通过线性回归分析计算出Fe-25Mn-3Si-3Al钢的热变形流变应力本构方程，得出试验钢的热变形激活能QHW为432.95kJ/mol。
The hot deformation behaviors of Fe-25Mn-3Si-3Al TWIP steel were investigated by isothermal compression on Gleeble-1500D thermal simulator at the temperature range of 900 to 1100℃ and the strain rate range of 0.01 to 1s-1. The results show the true stress-strain curves of Fe-25Mn-3Si-3Al steel present a characteristic of dynamic recrystallization which often appears during the hot deformation process of metals and alloys with low stacking fault energies. In true stress-strain curves, a single peak stress is observed, which is followed by a steady-state stress. The hot compression deformation of Fe-25Mn-3Si-3Al steel can be represented by Arrhenius model. The constitutive equation of Fe-25Mn-3Si-3Al steel for hot compression deformation is calculated by a linear regression analysis. The activation energy for hot deformation of the experimental steel is 432.95kJ/mol.
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