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利用Gleeble-1500D热模拟试验机对Ce微合金化IF钢在变形温度790~950℃,应变速率0.1~5 s-1,变形量50%条件下进行了单道次压缩试验,研究了变形条件对试验钢热变形行为的影响,结合热模拟组织金相分析及双曲正弦本构方程、动态再结晶动力学方程分析了钢中Ce含量对IF钢动态再结晶行为的影响。结果表明:随着变形温度的降低和应变速率的增加,试验钢的变形抗力增大;添加Ce后,试验钢的热变形激活能增大,由122.92 kJ·mol-1增加到182.75 kJ·mol-1;Avrami方程指数kd由3.796减小到3.377,动态再结晶分数Xd也相应减小,动态再结晶被抑制,并随着钢中Ce含量的增加,抑制作用越显著。
Single-pass compression tests were carried out on Ce microalloyed IF steels at temperatures ranging from 790 to 950 ° C at strain rates of 0.1 to 5 s-1 and deformations of 50% using a Gleeble-1500D thermal simulation machine. Deformation conditions The influence of Ce content in steel on the dynamic recrystallization behavior of IF steel was analyzed based on the thermomechanical microstructure analysis, hyperbolic sine constitutive equation and dynamic recrystallization kinetics equation. The results show that with the decrease of deformation temperature and strain rate, the deformation resistance of the test steel increases. After adding Ce, the thermal deformation activation energy of the test steel increases from 122.92 kJ · mol-1 to 182.75 kJ · mol -1; Avrami equation index kd decreased from 3.796 to 3.377, the dynamic recrystallization fraction Xd also decreased accordingly, dynamic recrystallization was inhibited, and with the increase of Ce content in steel, the more significant inhibition.