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利用热压缩试验的方法,在Gleeble-1500D型热模拟试验机上进行单、双道次压缩试验,研究了不同变形条件下微量稀土铈对IF钢再结晶行为的影响,分别绘制了铈添加前后试验钢在应变速率0.1~10 s-1,变形温度950℃,压缩变形50%的单道次真应力-真应变曲线以及不同道次间隔时间1~100 s,变形温度950℃,两道次压缩变形量均为30%的双道次真应力-真应变曲线。结果显示:950℃压缩变形时,应变速率低于1 s-1时,稀土铈对试验钢动态再结晶的抑制作用较明显;试验钢静态再结晶体积分数随道次间隔时间的延长而增加,稀土铈抑制试验钢静态再结晶的进行;稀土铈对晶界的拖拽作用是稀土抑制再结晶行为的主要机制。
Single-pass and double-pass compression tests were carried out on a Gleeble-1500D thermal simulator using a hot compression test. The effects of rare earth cerium on the recrystallization of IF steel under different deformation conditions were investigated. The effects of cerium addition before and after the test The true stress-true strain curves of single-pass steel with strain rate of 0.1-10 s-1, deformation temperature of 950 ° C. and compression deformation of 50% and the interval time of 1-100 s at different passes, the deformation temperature of 950 ° C., two-pass compression Two-pass True Stress-true Strain Curve with 30% Deformation. The results show that when the strain rate is lower than 1 s-1 at 950 ℃, the inhibition effect of rare earth cerium on the dynamic recrystallization of the test steel is obvious. The static recrystallization volume fraction of the test steel increases with the increase of the interval time, The rare earth cerium inhibits the static recrystallization of the test steel. The drag effect of rare earth cerium on the grain boundary is the main mechanism of rare earth suppression recrystallization.