Fe-18Mn-0.6C TWIP钢的热变形行为

在Gleeble-3500热模拟实验机上通过单道次压缩实验,研究了变形温度、应变速率和变形量对TWIP钢流变应力和临界动态再结晶行为的影响规律。结果表明,试验TWIP钢热变形的峰值应力随温度的升高而降低,随着应变速率的增大而升高;各种变形条件下,TWIP钢的奥氏体晶粒尺寸有很大差异,随着变形温度的升高,再结晶晶粒粗化,而应变速率和应变量的增加有利于晶粒细化;最后采用线性回归方法计算出TWIP钢的热变形激活能为443.3 kJ/mol,并求出了该钢种动态再结晶临界条件与Z参数之间的关系,以及动态再结晶动力学规律。

HOT DEFORMATION OF Fe-18Mn-0.6C TWIP STEEL

Influences of deformation temperature,strain rate and deformation degree on high temperature flow stress and critical recrystallization behavior of the TWIP steel were investigated.The results showed that the peak flow stress of TWIP steel under high temperature deformation decreased as the temperature increasing and on the other hand,it was evaluated as the strain rate increasing.Big differences existed in austensite grain size at different deformation conditions.With the increasing of deformation temperature,the grain coarsened.The strain rate and the amount of deformation were higher,the size of the recrystallized grains was smaller.The activation energy calculated by linear regression was 443.3 kJ/mol.The relationship between critical strain of dynamic recrystallization and Zener-Hollomon parameter and the dynamical mechanism for dynamic recrystallization was determined.