AZ31镁合金板材轧制过程中边部物理场分布  

Physical Field Distribution of AZ31 Magnesium Alloys Plate Edge in Rolling Process

作　　者：赵鸿金[1] 李涛涛[1] 杨正斌[1] 贺玲慧 

机构地区：[1]江西理工大学材料科学与工程学院,江西赣州341000

出　　处：《稀有金属》2016年第10期990-995,共6页Chinese Journal of Rare Metals

基　　金：国家自然科学基金项目(50964006)资助

摘　　要：采用数值模拟的方法研究了AZ31镁合金板材在轧制过程中板材边部的受力情况,从应变场、应力场、损伤因子等方面分析了宽厚比对边部裂纹的影响规律。结果表明,单道次轧制过程中,损伤因子值小于0.255时,轧制过程中选择宽厚比小于60∶1的板坯可有效控制边部裂纹产生,板坯损伤因子值小于0.139时,轧制过程中宽厚比小于4∶1的板坯可有效控制边部裂纹产生;在其他条件不变的情况下,减小板材的宽度,降低轧板边部所受拉应力,减小边部损伤值,有利于促进板坯变形均匀性;在加工率相同的情况下,随着宽厚比的不断增加,边部沿轧制方向上的应力峰值逐渐累积,心部等效应变场逐渐分成许多较小区域,变形更不均匀,边部损伤因子升高,导致轧件开裂几率提高,边部裂纹数量逐渐增加。The edge stress states of AZ31 magnesium alloys plate in rolling process were studied by numerical simulation. The influence of different width-to-thickness ratios on edge cracks was analyzed from aspects of damage factor, stress field and strain field. It showed that the edge cracks could be effectively controlled under conditions that the damage factor was less than 0. 255 and the width- to-thickness ratio was less than 60：1 as well as under conditions that the damage factor was less than 0. 139 and the width-to-thickness ratio was less than 4：1 in the single rolling pass. As other conditions remained unchanged, the width decrease of plate reduced tensile stress of the edges and edge damage value, which contributed to promoting deformation uniformity of plate ; under the same rolling reduction ratio, the edge peak stress along the rolling direction gradually accumulated, the damage factors of edges gradually increased, and the equivalent strain field in center part was divided into many small zones with the increase of width-to-thickness ratio, which re- sulted in worse deformation uniformity and the increase of crack ratio and edge eracks.

关 键 词：AZ31镁合金 数值模拟 损伤因子 宽厚比 边部裂纹 

分 类 号：TG335.56[金属学及工艺—金属压力加工]