Simulation of pressure effects on hot isostatic pressing of stainless steel powder  

作　　者：LIU Guo-cheng SHI Yu-sheng WEI Qing-song XUE Peng-ju 刘国承;史玉升;魏青松;薛鹏举(State Key Laboratory of Materials Processing and Die&Mould Technology,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]State Key Laboratory of Materials Processing and Die&Mould Technology,Huazhong University of Science and Technology,Wuhan 430074,China

出　　处：《Journal of Central South University》2012年第1期55-62,共8页中南大学学报（英文版）

基　　金：Project(2007AA03Z115) supported by the National High Technology Research and Development Program of China;Project(2009ZX04005-041-03) supported by the National Science and Technology Major Program of China;Project(2010MS046) supported by the Independent Fund of Huazhong University of Science and Technology,China

摘　　要：To investigate the effects of pressure on the hot isostatic pressing(HIP) process of a stainless steel powder,density distribution and deformation of the powder at four different applied pressure levels were predicted and compared by using finite element method(FEM).Constitutive relations of porous compacts during HIP process were derived based on the yield criterion of porous metal materials.Thermo-mechanical coupling calculations were carried out by the MSC.Marc.Densification mechanisms were studied through evolutions of relative density,equivalent plastic strain and equivalent viscoplastic strain rate for compacts.The simulation results were also compared with experimental data.The results show that the densification rate and final density of compacts increase dramatically with the increase in the applied pressure level when it is below 100 MPa during HIP process,and the creep for compacts evolves into steady stage with the improvement of density.To investigate the effects of pressure on the hot isostatic pressing （HIP） process of a stainless steel powder, density distribution and deformation of the powder at four different applied pressure levels were predicted and compared by using finite element method （FEM）. Constitutive relations of porous compacts during HIP process were derived based on the yield criterion of porous metal materials. Thermo-mechanical coupling calculations were carried out by the MSC.Marc. Densification mechanisms were studied through evolutions of relative density, equivalent plastic strain and equivalent viscoplastic strain rate for compacts. The simulation results were also compared with experimental data. The results show that the densification rate and final density of compacts increase dramatically with the increase in the applied pressure level when it is below 100 MPa during HIP process, and the creep for compacts evolves into steady stage with the improvement of density.

关 键 词：hot isostatic pressing （HIP） stainless steel powder numerical simulation densification mechanism applied pressure 

分 类 号：TF124.32[冶金工程—粉末冶金]