锻压技术

铝合金复杂薄壁件热等静压成形数值模拟

英文标题：Numerical simulation of complex thin-walled aluminum alloy part manufactured by hot isostatic pressing

作者：徐文才郎利辉黄西娜李飞

分类号：TF124

出版年,卷(期):页码：2019,44(6):65-72

摘要：

基于MSC.Marc有限元分析软件的Shima模型，对2A12铝合金复杂薄壁件热等静压成形过程进行数值模拟，并采用成形实验进行验证。模拟结果表明：由于模具约束作用，特征空心柱成形位置出现“喇叭口”；特征筋相对密度从上至下呈现梯度分布；石墨模具存在微变形，特征筋顶部和底部呈现不同程度的向内收缩趋势。实验结果表明：成形的特征筋、特征角度与模拟存在误差，但均在误差允许范围内；材料的抗拉强度为318.3 MPa，规定非比例延伸强度为176.3 MPa，断后伸长率为6.8%；断裂方式主要为沿晶、准解理断裂，由金相显微照片观察到粉末颗粒之间实现完全致密化。

Based on the Shima model in MSC.Marc finite element analysis software, the hot isostatic pressing process of complex thin-walled part for 2A12 aluminum alloy was simulated, and the forming experiments were conducted and validated. The simulation results show that due to the mold constraint, the bottom position of the characteristic hollow column appears ‘horn mouth’, the relative density of the characteristic rib presents gradient distribution from top to bottom, the graphite mold has micro-deformation, and the top and bottom of the characteristic rib show the varying degrees of inward contraction. The experimental results show that there are errors between the formed characteristic rib, characteristic angles and the simulation results, but they are within the error tolerance. However, the tensile strength is 318.3 MPa, the specified non-proportional extension strength of material is 176.3 MPa, and the elongation after fracture is 6.8%. Furthermore, the main fracture modes are quasi-cleavage fracture and intergranular fracture, and the full densification between powder particles is observed by the metallographic micrographs.

基金项目：

国家自然科学基金资助项目（51675029）

徐文才（1992－），男，硕士研究生 E-mail：xuwencai@buaa.edu.cn 通讯作者：郎利辉（1970-），男，博士，教授 E-mail：lang@buaa.edu.cn

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