合金温度对7075半固态模锻液相偏析的影响  

Influence of Alloy Temperature on the Liquid Phase Segregation of Semisolid Die Forging 7075 Alloy

作　　者：谭建波[1,2] 刘雪萍 李立新[1,2] 

机构地区：[1]河北科技大学材料科学与工程学院,河北石家庄050018 [2]河北省材料近净成形技术重点实验室,河北石家庄050018

出　　处：《铸造》2016年第6期538-541,共4页Foundry

基　　金：河北省自然科学基金项目(E2014208087);河北省高等学校科学技术研究项目(ZD2015003);河北省引进留学人员资助项目(C201400515)

摘　　要：应用DEFORM-3D软件对7075铝合金半固态模锻充型过程进行了模拟,研究了合金温度对7075铝合金杯形件充型过程的影响规律。在模拟的基础上,利用压力机及杯形实验模具,进行了半固态7075铝合金流变模锻成形,研究了合金温度对7075铝合金杯形件半固态模锻液相偏析的影响,模拟和实验结果表明:合金温度越高,充型越不平稳;在压头温度400℃、成形速度3.5 mm/s、成形比压50 MPa的条件下,随着合金温度的增加,杯形件的液相偏析度增加,组织越不均匀,当合金温度为628℃时,杯形件的液相偏析度为14.02%。The numerical simulation of semi-solid die forging forming process for 7075 aluminum alloy was made by DEFORM-3D to study the influence rule of alloy temperature on the forming process of cup part. According to the simulation results the die forging forming of the part was made to research the influence of alloy temperature on the liquid phase segregation by means of press machine and cup mould. The results show that the higher of the temperature, the more unstable of the mould filling. Under the condition of 400 ℃ of head temperature, 3.5 mm/s of the forming velocity, and 50 MPa of the forming pressure, the liquid phase segregation degree of cup part increases, the microstructure is not more uniform along with increase of alloy temperature. The segregation degree is up to 14.02% as the alloy temperature is 628℃.

关 键 词：半固态 流变模锻 7075合金 组织均匀性 液相偏析度 

分 类 号：TG319[金属学及工艺—金属压力加工]