挤压速度对Ti6Al4V钛合金等通道转直角挤压过程影响的数值模拟  

Numerical simulation of equal-channel angular pressing process of Ti6Al4V titanium alloy at a right angle and different extrussion speed

作　　者：蒋汶桓 杨欢 温良英[1,2] 蒋稼欢[3] 宋国立[3,4] JIANG Wenhuan;YANG Huan;WEN Liangying;JIANG Jiahuan;SUNG Paul K-L(School of Materials Science and Engineering,Chongqing University,Chongqing 400044;Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and Advanced Materials,Chongqing University,Chongqing 400044;Bioengineering College of Chongqing University,Chongqing 400044,P.R.China;Chongqing Kuo-Li Innovative Bio-Tech Co.Ltd,Chongqing 401121,P.R.China)

机构地区：[1]重庆大学材料科学与工程学院,重庆400044 [2]重庆大学钒钛冶金及新材料重庆市重点实验室,重庆400044 [3]重庆大学生物工程学院,重庆400044 [4]重庆国立元创生物科技有限公司,重庆401121

出　　处：《重庆大学学报（自然科学版）》2019年第10期31-41,共11页Journal of Chongqing University

基　　金：重庆市基础研究与前沿技术研究计划资助项目(cstc2018jcyjAX0003)~~

摘　　要：采用Deform-3D有限元软件,对样品初始温度为900℃的Ti6Al4V钛合金等通道转直角挤压在0~5mm/s的下压速度范围内进行了数值模拟。模拟计算结果表明:在相同的挤压速度下,试样通过转角后的温度降低速率减小;挤压速度越大,挤压过程所需的荷载越低,应变累积越小,等效应力越低,应力集中现象越少,挤压过程中试样的温降越小;本研究条件下,挤压速度值选定为5mm/s。An extrusion process of Ti6Al4Vtitanium alloy at 900℃ under equal-channel angular pressing(ECAP)at a 90°angle was numerically simulated at a different extrusion speed in the range of 0~5mm/s by using Deform-3Dfinite element software.The simulation results show that at the same extrusion speed,the rate of temperature decrease after the sample passes through the corner is reduced;the higher the extrusion speed,the lower the load required for the extrusion process,the smaller the strain accumulation,the lower the equivalent stress,the less the stress concentration phenomenon,and the smaller the temperature drop of the sample in the extrusion process.In this study,the extrusion speed was selected as 5mm/s.

关 键 词：等通道转角挤压 有限元模拟 钛合金 挤压速度 等效应变 

分 类 号：TG376[金属学及工艺—金属压力加工]