热加工工艺参数对310S铸坯等轴晶组织动态再结晶影响  

Effect of hot working on the recrystallization of 310S equiaxed grains

作　　者：刘天增 王建泽 李具仓 邹德宁[2] 

机构地区：[1]酒钢宏兴股份公司钢铁研究院,嘉峪关735100 [2]西安建筑科技大学,西安710061

出　　处：《塑性工程学报》2016年第3期139-144,共6页Journal of Plasticity Engineering

摘　　要：通过热模拟实验和显微组织分析,研究了热变形工艺参数对310S钢再结晶行为的影响规律。结果表明,在1 100℃、0.1s^(-1)条件下,变形量>15%时发生动态再结晶,变形量达到60%时,晶内和晶界均出现大量的再结晶晶粒。随着变形温度的升高,再结晶过程逐渐充分,晶粒尺寸趋于均匀。在相同变形温度下,应变速率越低,晶粒尺寸越大;随着应变速率升高,再结晶晶粒尺寸逐渐减小,在变形温度为1 000℃,应变速率为10s^(-1)、0.01s^(-1)条件下,再结晶晶粒尺寸分别为15μm和45.4μm。分析表明等轴晶310S钢的热变形再结晶机制主要由晶界弓弯形核和晶内亚晶界演变形核两种机制共同控制。By thermal simulation testing and optical microscope, the effects of hot working on the recrystallization behavior of the industrial smelting 310S billet were analyzed. The results show that, at the condition of 1100 ℃/0.1 s-1 , the recrystallization behavior occurred when the deformation amount reached more than 15% and when the pressure reaches 60%, a lot of recrystallization grains appeared inside the crystal and along the grain boundary. With the increase of the deformation temperature, the recrystallization process becomes more and more full, and the grain size tends to be uniform. At the same deformation temperature, with the lower strain rate, the grain size becomes larger; with the increasing strain rate, the recrystallization grain size decreases. At the deformation temperature of 1000℃ and strain rates of 10s-t and 0.01 s-1 conditions, the recrystalhzation grain sizes are 15μm and 45.4μm, respectively. The analysis results show that the DRX mechanism in 310S steel hot deformation is mainly attributed to the grain boundary bow nucleation and the transgranular subgrain boundary evolution.

关 键 词：310S 等轴晶 组织 再结晶 机理 

分 类 号：TG335.6[金属学及工艺—金属压力加工]