基于二次开发的AZ31镁合金热轧有限元模拟和实验研究

发布时间：2018-05-31 17:07

本文选题：AZ镁合金 + 热轧　；参考：《塑性工程学报》2017年06期

【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。
[Abstract]:The secondary development of the material model of AZ31 magnesium alloy was carried out by using the Fortran program interface provided by ABAQUS to the user to customize the constitutive model of the material. A custom user material subprogram was developed and the finite element numerical simulation of AZ31 magnesium alloy hot rolling process was carried out. The variation of the temperature and strain field in the thickness direction of the sheet metal in the deformation zone was studied under the conditions of the initial rolling temperature of 673K and the different reduction rates. The numerical simulation results show that the temperature changes of the plate near the surface and the center of the deformation zone are different. With rolling, the surface temperature first drops sharply, then increases slightly, and the core temperature increases by a small margin, then decreases significantly, and the temperature difference between the surface and the center is between 30 ~ 40 K. The strain near the surface of the plate is higher than that of the central layer, and the strain increases gradually with the increase of the compression rate. The results of microstructure observation show that the dynamic recrystallization degree of the plate is higher than that of the center due to the large strain near the surface of the plate.
【作者单位】：大连交通大学连续挤压工程研究中心;广西沿海铁路股份有限公司;
【基金】：国家自然科学基金资助项目(51401043)
【分类号】：TG146.22;TG339

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