摘要
通过合理调节动态再结晶机制,改善AZ31镁合金棒材减径挤压工艺过程中表层微观组织、细化晶粒,对提高棒材质量有着重要作用。采用有限元数值模拟、理论分析和试验研究相结合的方法,获得了减径比λ=4时,规格为Φ=40 mm的AZ31镁合金棒材减径挤压过程中挤压力的变化曲线,动态再结晶体积分数、平均晶粒尺寸沿棒材径向的分布规律。结果表明,平均晶粒尺寸沿棒材径向由内向外不断减小,表层晶粒尺寸约为30μm。
The proper and effective adjustment of the dynamic recrystallization mechanism plays a crucial role in the reducing diameter extrusion process of AZ31 Mg-alloy bar,improving microstruc, ture on the surface,refining grains and advancing comprehensive quality. The combining method of finite element numerical simulation, theoretical analysis and experiment research was applied to investigate the change law of extrusion pressure,dynamic recrystalli zation volume fraction and distribution law of the average grain size on the radial direction of the bar during the reducing diameter extrusion on AZ31 Mg-alloy bar,whose reducing ratio is equalling to 4 and the diameter is 40 mm. The resuhs showed that the average grain size de creased along the radial direction from the inside to the outside and the surface grain size was about 30μm.
出处
《轻合金加工技术》
CAS
北大核心
2013年第10期35-37,共3页
Light Alloy Fabrication Technology
基金
陕西省教育厅2012年科学研究项目计划(12JK1075)
关键词
AZ31镁合金棒材
减径挤压
宏微观耦合
有限元
AZ31 Mg-alloy bar
reducing diameter exlrusion
macro and micro coupling
finite element
