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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0.01~1 s-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432.95 kJ/mol。
The isothermal compression tests were carried out on a Gleeble-1500D thermal simulator to study the thermal behavior of the high-manganese austenitic Fe-25Mn-3Si-3Al TWIP steel at a deformation temperature of 900-1100 ℃ and a deformation rate of 0.01-1 s -1 Deformation behavior. The results show that the flow stress curve of hot deformation of Fe-25Mn-3Si-3Al steel exhibits obvious dynamic recrystallization characteristics, and a clear peak value of flow stress appears. After the peak value, the flow stress gradually decreases and the steady-state flow changes. The hyperbolic sinusoidal Arrhenius equation can describe the thermal deformation behavior of Fe-25Mn-3Si-3Al steel well and calculate the thermal deformation constitutive equation of Fe-25Mn-3Si-3Al steel by linear regression analysis. The hot deformation activation energy of the test steel, QHW, was 432.95 kJ / mol.