锻压技术

Al-Mg-Mn合金不等径角挤压有限元分析及实验研究

英文标题：Finite element simulation and experimental research of alloy Al-Mg-Zn by unequal channel angular extrusion

作者：赵炯陈恩厚黎克楠邴建立

分类号：

出版年,卷(期):页码：2016,41(4):54-59

摘要：

利用Deform-3D软件对Al-Mg-Mn合金进行了不等径角挤压有限元分析，研究了变形过程中试样的等效应变、等效应力分布规律以及挤压载荷的变化情况，并与同等条件下的等径角挤压进行了对比。模拟结果表明，不等径角挤压过程中，坯料在转角处会同时发生剪切变形与径向挤压变形，所需的挤压力较等径角挤压更大，但单道次应变量显著提升，提高了挤压效率与晶粒细化能力；不等径角挤压后，应变沿坯料长度方向呈现分段分布，从料头区域至料尾方向逐渐增大，然而坯料横截面上各处应变差别较小、无应变层化现象。实验验证结果表明，UECAP 工艺可以显著细化Al-Mg6-Mn0.7合金晶粒，与模拟结果相符。

Unequal channel angular extrusion (UECAE) of alloy Al-Mg-Mn was numerically simulated by finite element software Deform-3D. The distribution of equivalent strain and equivalent stress in the workpiece as well as load-time curve during forming process were analyzed and compared with that of ECAE under the same simulation condition. The results show that both shear deformation and radial extrusion deformation occur near the arc segment during UECAE. The load of UECAE is bigger than that of ECAE, but the single pass equivalent strain of UECAE increases effectively to improve the production efficiency and grain refinement. After UECAE, the strain segmentary distributed strain increase along the longitudinal direction from the head to the end. However, the equivalent strain distribution on the intersecting surface is homogeneous without strain stratification phenomenon. Experimental results show that the grain of alloy Al-Mg-Mn is refined by UECAE，which is consistent with the simulation results.

基金项目：

国家科技重大专项（2012ZX04003-081）；河南省重大科技专项（131100211000）

赵炯（1988-），男，硕士，工程师

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