摘要
采用有限元模拟方法对AZ31B镁合金板材挤压过程中的应力场、应变场和挤压力随工艺参数的变化规律进行研究.所研究的挤压工艺参数包括:挤压温度、挤压比和挤压速度等。结果表明:随着坯料挤压温度的升高,最大等效应变值从17. 6逐渐增大至26. 4;最大等效应力值由133. 2 MPa减小至43. 4 MPa;挤压温度高于350℃后,挤压力变化不大.随着挤压比的增加,挤压力由7. 328 MN增大至8. 808 MN;最大等效应变值先减小后增大;最大等效应力值由87 MPa增加至119 MPa.随着挤压速度的增加,挤压力从2. 14 MN增加至3. 42 MN;最大等效应变值先增大后减小;最大等效应力值由72. 3 MPa逐渐增大至104. 2MPa.
The changes regulations of stress field,strain field and extrusion force with different process parameters in the extrusion process of AZ31B magnesium alloy sheet is studied.The process parameters of extrusion temperature,extrusion ratio and extrusion speed were investigated.The results showed that the maximum value of equivalent strain gradually increases from 17.6 to 26.4 and the maximum value of equivalent stress decreases from 133.2 MPa to 43.4 MPa as the initial temperature of the billets increases.The extrusion force keeps stable when the initial temperature is higher than 350 ℃,As the extrusion ratio increases,the extrusion force increases from 7.328 MN to 8.808 MN,the maximum value of the equivalent strain decreases firstly and then increases,and the maximum value of the equivalent stress increases from 87 MPa to 119 MPa.As the extrusion speed increases,the extrusion pressure increases from 2.14 MN to 3.42 MN,the maximum equivalent strain value first increases and then decreases.Simultaneously the maximum equivalent stress value gradually increases from 72.3 MPa to 104.2 MPa.
作者
丁云鹏
张铭轩
许记雷
郭晓琴
王艳
张锐
乐启炽
Ding Yunpeng;Zhang Mingxuan;Xu Jilei;Guo Xiaoqin;Wang Yan;Zhang Rui;Le Qichi(Henan Key Laboratory of Aeronautical Materials and Applied Technology,Zhengzhou University of Aeronautics,Zhengzhou 450046,China;Key Laboratory of Electromagnetic Processing of Materials,Northeastern University,Shenyang 110004,China)
出处
《材料与冶金学报》
CAS
北大核心
2019年第2期141-146,152,共7页
Journal of Materials and Metallurgy
基金
2018年度河南省高等学校重点科研项目(18A450002)
关键词
镁合金
有限元模拟
挤压力
应力应变场
magnesium alloy
finite element analogy
extrusion force
the field of stress and strain
