铸轧态AZ31B镁合金热轧制元胞自动机法数值模拟研究  

Numerical Simulation on Hot Rolling Cellular Automata Method of Cast-Roll AZ31B Mg Alloy

作　　者：蒋亚平[1] 马立峰[1] 贾伟涛[1] 

机构地区：[1]太原科技大学重型机械教育部工程研究中心,山西太原030024

出　　处：《热加工工艺》2016年第5期100-103,107,共5页Hot Working Technology

基　　金：国家973计划项目(2012CB722800);国家自然科学基金项目(51105264);中国博士后科学基金项目(2012M520677);山西省高校青年学术带头人计划项目(TYAL);山西省科技攻关项目(20130321010-03)

摘　　要：在轧制温度350℃和轧制速度0.5 m/s条件下,分别以20%,30%,40%的压下量对铸轧态AZ31B镁合金板进行了轧制实验,对比了轧制后的微观组织,探究在不同压下量下镁合金板边部和中部区域微观组织变化及其产生原因。结合CA(元胞自动机)数学模型对镁合金的动态再结晶过程进行了数值模拟。结果表明:区域应力场变化所引起的空洞聚集是轧制裂纹扩展的主要原因之一;镁合金板中部和边部晶粒尺寸值平均减小幅度为39.6%和55.5%;CA数值模拟结果预测精度较高,平均相对预测误差在16.03%以内。Cast-roll AZ31 B magnesium alloy plate was subjected to rolling with reduction of 20%, 30% and 40%respectively at rolling temperature of 350℃ and rolling speed of 0.5 m/s. The microstructures after rolling were contrasted.The microstructure changing and its causes of magnesium plate in edge and central regions were explored. Combined with CA（cellular automata） mathematic model, the dynamic recrystallization process of AZ31 B magnesium alloy was numerically simulated. The results show that： the hole accumulation caused by the variation of regional stress field is one of the main causes of rolling crack extending. The average reduction rates of the grain size of the magnesium plate in the central and edge are 39.6% and 55.5%.The prediction accuracy of CA numerical simulation results is high, and the average relative prediction error is within 16.03%.

关 键 词：CA法 β(Mg17Al12) 动态再结晶 

分 类 号：TG339[金属学及工艺—金属压力加工] TG146.22[一般工业技术—材料科学与工程]