光学用铍材冷、热等静压成形数值模拟  

Numerical Simulation for Metal Beryllium Used by Optics Components during Process of Cold&Hot Isostatic Pressing

作　　者：续昊 何力军 李志年 叶书鹏 王东新 李春光 Xu Hao;He Lijun;Li Zhinian;Ye Shupeng;Wang Dongxin;Li Chunguang(Ningxia Key Laboratory of Photovoltaic Materials,Ningxia University,Yinchuan 750021,China;State Key Laboratory of Special Rare Metal Materials,Northwest Metal Materials Research Institute Co.,Ltd.,Shizuishan 753000,China)

机构地区：[1]宁夏大学宁夏光伏材料重点实验室,宁夏银川750021 [2]西北稀有金属材料研究院有限公司,稀有金属特种材料国家重点实验室,宁夏石嘴山753000

出　　处：《稀有金属》2022年第2期185-194,共10页Chinese Journal of Rare Metals

基　　金：西北稀有金属材料研究院稀有金属特种材料国家重点实验室开放课题基金项目(SKL2017K001);宁夏研究生教育教学改革研究与实践项目(YJG201809);宁夏自然科学基金项目(NX17037)资助。

摘　　要：利用多孔铍实测Shima型屈服准则,运行于MSC.Marc有限元平台,对光学用金属铍冷等静压(CIP)、热等静压(HIP)过程分别进行数值仿真和分析。数值结果与实测值进行了对比。研究表明:(1)基于实测屈服准则对铍粉末冶金过程的仿真精度完全可以满足工程要求,对CIP过程,铍坯压实密度的误差低于0.9%,最大尺寸误差约为4%;对HIP过程,铍坯压实密度与实测相同,最大尺寸误差低于2%。(2)CIP过程中铍坯的致密化一直持续进行到降压段前期;而在HIP过程中铍坯的致密化则在升温段基本完成。(3)CIP完成后铍体的残余应力水平非常低,仅在数兆帕量级;HIP过程在铍体内形成的残余应力为温度应力,高值区主要分布在铍体尖角、棱边等处,最大值超过400 MPa。(4)CIP,HIP过程中铍坯的等效应变与相对密度间具有显著的线性关联性。Beryllium has key applications in aviation,aerospace,nuclear and other fields due to its excellent comprehensive properties.On the other hand,beryllium is also a kind of scarce and expensive material.At present,the adjustment and improvement of the beryllium production process still relies on the traditional trial and error method,which is time-consuming and high in financial costs.In order to improve this situation,this paper tried to introduce the numerical simulation method into the study of the powder metallurgy forming process of beryllium.The simulation platform was the finite element analysis software MSC.Marc.The simulation object was a non-compact beryllium powder billet with cuboid shape under two processes,respectively.In the hot isostatic pressing(HIP)process the billet was wrapped in a Q235 stainless steel canning,before pressing its initial relative density was 0.75(the compact density was set to 1);in the cold isostatic pressing(CIP)process it was wrapped in a rubber canning,with the initial relative density of 0.54.The professional engineering drawing software SolidWorks was used for modeling,the mesh generation tool HyperMesh was used to divide the eight-node hexahedron high-quality mesh.Then the 3D model built by the method mentioned above was imported into MSC.Marc.Shima yield criterion was applied to the beryllium powder billet,Von-Mises yield criterion was applied to the Q235 stainless steel canning,and Mooney-Rivlin model was applied to the rubber canning.The process curve of the simulation was determined with reference to the actual production process:the holding pressure of the CIP process was set to 250 MPa;the holding pressure and holding temperature of the HIP process were set to 145 MPa and 1100℃,respectively.Working condition parameters were set as follows:selecting transient analysis for the coupling analysis of the isostatic pressure process(HIP,CIP);selecting the large strain updated Lagrangian method to describe the forming convergence process;selecting the relative displacement

关 键 词：铍 Shima模型 数值模拟 冷等静压(CIP) 热等静压(HIP) 

分 类 号：TG146.24[一般工业技术—材料科学与工程]