钨铜复合粉末成形过程的颗粒尺度数值模拟  

Particulate scale numerical simulation of W and Cu composite powders forming process

作　　者：孙梦丽 韩鹏[1] 徐英士 SUN Mengli;HAN Peng;XU Yingshi(School of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan 114000,China;Angang Steel Company Limited,Anshan 114000,China)

机构地区：[1]辽宁科技大学材料与冶金学院,辽宁鞍山114000 [2]鞍钢股份有限公司,辽宁鞍山114000

出　　处：《粉末冶金工业》2023年第5期74-80,共7页Powder Metallurgy Industry

基　　金：十四五国家重点研发计划资助项目(2021YFB3702000);辽宁科技大学大学生创新创业项目(S202210146056)。

摘　　要：采用多粒子有限元方法对钨铜复合粉末的二维模压成形过程进行数值模拟。系统研究和分析了铜粉含量和压力对成形过程中压坯相对密度及分布、应力及分布、颗粒变形、孔隙填充行为以及力链结构的影响规律。结果表明:成形过程中应力主要集中在钨颗粒内部,并形成力链阻碍致密化的进程。孔隙的填充主要通过铜颗粒的变形来实现,相互接触的钨颗粒形成了难以填充的细小孔隙。钨铜颗粒边缘部位的应力都高于中心应力。随着压制压力的增加,铜颗粒比钨颗粒中心部位应力增长缓慢,沿压制方向上钨颗粒边缘应力值远大于颗粒中心部位。综合分析,钨颗粒的变形特性是阻碍成形致密化进程的关键因素,需要优化钨颗粒的排列结构,从而实现高性能压坯。In this paper,2D compaction of tungsten and copper composite powders was simulated by multi-particle finite element method.The effects of copper powder content and pressure on relative density and distribution,stress and distribution,particle deformation,void filling behavior,and force transmission in the compact during compaction were systematically studied and analyzed.The results indicate that force is mainly concentrated inside tungsten particles forming the contact force network which impedes the compaction densification.During compaction,void filling is mainly implemented by the deformation of copper particles,and the contacting tungsten particles produce small void that are difficult to fill.The stress at the edge of tungsten and copper particles is higher than that at the center of particles.With the increase of the compression pressure,the stress in the center of the copper particles increases more slowly than that in the tungsten particles,and the stress value at the edge of the tungsten particles along the compression direction is much greater than that at the center of the particles.According to the comprehensive analysis,the deformation characteristics of tungsten particles are the key factors hindering the densification process,and the arrangement structure of tungsten particles should be optimized to achieve high performance compact.

关 键 词：粉末冶金 复合粉末成形 多粒子有限元 颗粒尺度模拟 钨铜复合粉末 

分 类 号：TF125[冶金工程—粉末冶金]