12vol%SiC_P/2024Al基复合材料热挤压过程有限元模拟与分析

Finite element simulation and analysis of 12 vol%SiC_P/2024Al matrix composites for hot extrusion process

基于MSC.Marc软件平台,建立了含SiCP体积分数为12%的SiCP/2024Al复合材料热挤压轴对称刚-塑性热力耦合有限元分析模型。利用该模型对复合材料的热挤压过程进行模拟,分析了热挤压过程中的载荷-行程曲线和材料流动状态,讨论了模具温度及挤压速度对挤压载荷的影响。模拟结果表明,该坯料在挤压比为30∶1、挤压温度为400-450℃、挤压速度为0.1-1.0 mm/s、挤压载荷为4.0×106-5.0×106N之间能够顺利挤出表面无缺陷的复合材料棒材。最后通过在700 t水压机上采用相同工艺挤出高质量的复合材料棒材验证该工艺的可行性。

An axisymmetric rigid-plastic and coupled thermo-mechanical FEM model of SiCP/2024Al composite（volume fraction of SiCP 12%） for plat die hot extrusion process was established based on the software MSC.Marc.The model was used to simulate the hot extrusion process of the material.The pressure-stroke curves and flow lines were analyzed and the effects of temperature of billet and extrusion velocity were discussed.The results indicate that bars without surface defects can be obtained smoothly under the condition of the extrusion ratio 30∶1,temperature 400-450℃,extrusion rate 0.1-1.0 mm/s and extrusion pressure 4.0×106-5.0×106 N.The quality bars were got following the same process on 700 t hydraulic press to prove the feasibility of this process.