论文部分内容阅读
采用Deform-3D有限元软件,在挤压温度为250~400℃条件下,对AZ31镁合金等径角挤压工艺进行了数值模拟,主要分析塑形成型过程中的挤压载荷、等效应力和等效应变的变化规律。结果表明,AZ31镁合金塑形成型过程中挤压载荷分为3个阶段:无明显变形阶段、快速增长阶段和稳定变形阶段。挤压载荷随着挤压温度的增加显著下降,试样的等效应力分布不均,模具转角处等效应力较大,存在应力集中现象,等效应变逐渐增加,在转角剪切区最大。试样经过ECAP变形后,心部等效应变大,从内向外应变呈减小的趋势,试样上部等效应变较大,下部等效应变相对较小,组织均匀性较好。
The Deform-3D finite element software was used to simulate the equal-angular-angular extrusion process of AZ31 magnesium alloy under the condition of extrusion temperature of 250-400 ℃. The extrusion load, equivalent stress And the variation of equivalent strain. The results show that the compressive load of AZ31 magnesium alloy during plastic forming process is divided into three stages: no obvious deformation stage, rapid growth stage and steady deformation stage. The compressive load decreased significantly with the increase of extrusion temperature, and the equivalent stress distributed unevenly. The equivalent stress was larger at the corner of the die. There was stress concentration and the equivalent strain increased gradually. After ECAP deformation, the equivalent strain of the heart is large, and the strain tends to decrease from the inside to the outside. The upper equivalent strain of the specimen is larger, the lower equivalent strain is relatively smaller and the uniformity of the structure is better.