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在变形温度800~1100℃,变形速率0.01~5 s-1范围内,利用Gleeble-1500D热模拟试验机,采用等温压缩实验研究了Fe-25Mn-3Al高锰奥氏体TWIP钢的热变形行为。结果表明,Fe-25Mn-3Al钢流变应力曲线出现一个明显的流变应力峰值,峰值之后流变应力逐渐降低,主要为稳态流变特征。双曲正弦形式的Arrhenius模型可以较好地描述Fe-25Mn-3Al钢热变形流变应力,钢的热变形激活能Q为365.2 kJ/mol。动态再结晶机制为Fe-25Mn-3Al钢热变形过程中最主要的动态软化机制。
The hot deformation behavior of Fe-25Mn-3Al high-manganese austenitic TWIP steel was studied by means of isothermal compression experiment at a deformation temperature of 800-1100 ℃ and a deformation rate of 0.01-5 s-1 using a Gleeble-1500D thermal simulation tester . The results show that a significant peak of flow stress appears in the flow stress curve of Fe-25Mn-3Al steel, and the flow stress gradually decreases after the peak, which is mainly the steady-state rheological characteristics. Hyperbolic sine Arrhenius model can describe the hot deformation flow stress of Fe-25Mn-3Al steel, and the heat deformation activation energy Q of steel is 365.2 kJ / mol. The dynamic recrystallization mechanism is the most important dynamic softening mechanism in the hot deformation of Fe-25Mn-3Al steel.