基于二次开发的AZ31镁合金热轧有限元模拟和实验研究  

Experimental studies and finite element simulation on AZ31 magnesium alloy during hot rolling based on secondary development

作　　者：郭丽丽[1] 王长峰[1] 詹鉴 

机构地区：[1]大连交通大学连续挤压工程研究中心,辽宁大连116021 [2]广西沿海铁路股份有限公司,广西南宁530000

出　　处：《塑性工程学报》2017年第6期48-54,共7页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(51401043)

摘　　要：利用ABAQUS提供给用户自定义材料本构模型的Fortran程序接口,对AZ31镁合金进行了材料模型的二次开发,编写了自定义的用户材料子程序(UMAT),并对AZ31镁合金热轧过程进行了有限元数值模拟。主要研究了初始轧件温度为673 K,不同压下率的条件下,板材变形区内厚度方向的温度和应变场的变化情况。数值模拟结果表明:板材在变形区内表面附近和中心位置的温度变化情况不同。随轧制的进行,表面温度先是骤降,然后有小幅度的上升;板材心部温度先是有小幅度的升高,然后大幅度的下降,表面和中心温差在30~40 K之间。板材近表面的应变高于中心层,随压下率的增加应变逐渐增加。微观组织观察结果表明:板材近表面的较大应变导致动态再结晶程度明显高于中心位置。User material subroutine（ UMAT） was developed by Fortran programming interfaces based on ABAQUS for secondary development of AZ31 magnesium alloy and numerical simulation of AZ31 magnesium alloys during hot rolling process was carried out. Temperature and strain distributions in thickness direction of the deformed area of sheets were investigated with intial rolling temperature of 673 K and various reductions. The results show that the temperature change near the deformed sheet surface is different from that of the sheet center,the temperature of the surface layer decreases firstly,and then increases slightly with rolling time; in the sheet center,the temperature increases a little bit firstly,and then decreases sharply with the rolling time,and the temperature difference between the sheet surface and the center is 30-40 K. Equivalent strain of the sheet surface is higher than that of the center,and the equivalent stain increases with the reduction increases. It is showed in microstructural observation that the degree of dynamic recrystallization near the surface caused by larger strain is obviously higher than that of the center.

关 键 词：AZ31镁合金 热轧 数值模拟 微观组织 

分 类 号：TG386[金属学及工艺—金属压力加工]