铸态30Mn钢热变形过程中的动态再结晶行为

Dynamic recrystallization behavior of as-cast 30Mn steel during hot deformation

基于铸辗复合成形工艺,研究了铸态30Mn钢在变形温度为950-1150℃,应变速率为0.1、0.5和1 s-1时的热压缩变形中的动态再结晶行为。结果表明,在不同应变速率条件下,当形变温度高于1000℃时,所有试样都能发生动态再结晶。铸态30Mn钢动态再结晶激活能为305.83 k J/mol;临界应变与峰值应变的比值为0.57,临界应力与峰值应力的比值为0.90;分别建立了动态再结晶体积分数和平均晶粒尺寸模型;分析了不同变形条件的显微组织。

Based on the cast-rolling forming technique,the dynamic recrystallization behavior of hot compression deformation of the as-cast30 Mn steel were investigated at deformation temperatures from 950 to 1150 ℃ and strain rates of 0.1,0.5 and 1 s^-1.The results show that the dynamic recrystallization takes place at deformation temperatures above 1000 ℃ and different strain rates for all samples.The activation energy of the tested steel is determined as 305.83 k J / mol.The ratio of critical strain to peak strain and that of critical stress to peak stress are 0.57 and 0.90,respectively.The models of dynamic recrystallization volume fraction and the average grain size are developed.The microstructure of the samples under different deformation conditions is analyzed.