粒子激发形核对动态再结晶影响的模拟  

Simulation of the Effect of Particle Stimulating Nucleation on Dynamic Recrystallization

作　　者：关小军[1] 禹宝军[1] GUAN Xiaojun;YU Baojun(School of Material Science and Engineering,Shandong University,Jinan 250061,China)

机构地区：[1]山东大学材料科学与工程学院,山东济南250061

出　　处：《徐州工程学院学报（自然科学版）》2018年第4期1-5,26,共6页Journal of Xuzhou Institute of Technology(Natural Sciences Edition)

基　　金：高等学校博士学科点专项科研基金项目(200804220021)

摘　　要：为了模拟粒子激发形核对于动态再结晶行为的影响,将粒子的激发形核、钉扎晶界效应和非均匀位错密度增量模型引入传统的动态再结晶元胞自动机模型,以HPS485wf钢为研究对象,在设定的3种大尺寸析出粒子体积分数状态下,模拟了动态再结晶过程,并通过同样变形条件下热压缩模拟实验进行了验证.结果表明:这一改进模型不仅模拟了孕育—形核—长大、多轮次、形核有序的动态再结晶组织演变特征,而且真实模拟了粒子激发形核效应及其对于动态再结晶的影响.For simulating the effects of particle stimulating nucleation on dynamic recrystallization,a modified cellular automaton model was proposed by introducing particle stimulating nucleation action,pinning grain boundary action and a non-uniform dislocation density incremental model into the traditional model.Taking HPS485wf steel as research object,the three dynamic recrystallization processes at the states of set large-sized precipitate particle with different volume fraction were simulated by using this model,and were compared with the results of its hot-compressed test at same deformation conditions.The results show that this improved model can not only simulate the microstructure evolution features of the dynamic recrystallization in terms of the multi-rounded and orderly states of breeding→nucleating→growing,but also simulate the particle stimulating nucleation and its effect on dynamic recrystallization.

关 键 词：动态再结晶 模拟 粒子激发形核 钉扎晶界 位错密度非均匀分布 元胞自动机 

分 类 号：TG111[金属学及工艺—物理冶金]