铜镁合金CuMg0.3棒料连续挤压微观组织演变数值模拟分析

Numerical simulation analysis of microstructure evolution in the continuous extrusion for CuMg0.3 Cu-Mg alloy

在Deform-3D软件中根据连续挤压工艺中各主要模块建立连续挤压变形模型,对铜镁合金棒料的连续挤压变形过程进行数值模拟,重点分析了连续挤压过程中轧制变形区、镦粗变形区、扩展成形区和定径挤压成形区的晶粒度变化规律。将数值模拟结果与试验结果进行对比分析发现:铜镁合金棒料在挤压轮槽摩擦力的驱动下,一直处在流动变形过程中,且变形程度大、变形温度高、停留时间短,大部分材料发生动态再结晶后晶粒未长大;经过各主要变形区后的最终挤压成形的铜镁合金板材的晶粒得到极大细化,其相关力学性能得到改善。

The continuous extrusion deformation model was established based on the main modules of the continuous extrusion process in Deform-3D software. The continuous extrusion process of Cu-Mg alloy bar was numerically simulated, and the change regulations of grain size in the rolling deformation zone, upsetting deformation zone, extension forming zone and sizing extrusion forming zone of continuous ex- trusion process were analyzed. Comparing the results of numerical simulation with experimental results, it is found that Cu-Mg alloy bar retains in the process of flow deformation drove by the extrusion wheel groove friction, and during the process, there are large deformation degree, high deformation temperature, short stop time and without growing up grain size for most of the material after the occurrence of dynamic recrystallization. Therefore, after the main deformation zone oecures, grain size of final extrusion forming Cu-Mg alloy sheet is re- fined greatly, and the related mechanical properties are also improved.