压头温度对挤压铸造7075半固态组织均匀性的影响  

Influence of Plunger Temperature on Uniformity of Microstructure of Semi-solid Squeeze Casting 7075 Alloy

作　　者：谭建波[1] 刘雪萍[1] 李立新[1] Tan Jianbo Liu Xueping Li Lixin(Hebei Key Laboratory of Material Near-net Forming Technology, School of Material Science and Engineering, Hebei University of Science and Technolog)

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

出　　处：《特种铸造及有色合金》2016年第10期1054-1056,共3页Special Casting & Nonferrous Alloys

基　　金：河北省自然科学基金资助项目(E2014208087);河北省高等学校科学技术研究资助项目(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铝合金半固态挤压铸造充型过程进行了模拟,研究了压头预热温度对7075铝合金杯形件充型过程的影响。在模拟的基础上,利用压力机及杯形试验模具,进行了半固态7075铝合金流变挤压铸造成形,分析了压头预热温度对7075铝合金杯形件半固态挤压铸造组织均匀性的影响。模拟和试验结果表明,压头预热温度越高,充型越平稳;在合金温度为628℃,成形比压为50 MPa,成形速度为3.5mm/s的条件下,随着压头预热温度的增加,杯形件的液相偏析度减小,组织更加均匀。当压头温度为400℃时,杯形件的液相偏析度最小,为14.02%。The semi-solid squeeze casting process for 7075 aluminum alloy was simulated by the DEFORM-3Dsoftware to understand influence of plunger preheating temperature on the forming process of cup part.According to the simulated results,the squeeze casting forming of the part was carried out to analyze influence of plunger preheating temperature on the uniformity of microstructure by means of press machine and cup mould.The results show that the filling stability is improved with increasing in plunger pre-heating temperature.At 628 ℃for 50 MPa and 3.5mm/s,the segregation degree of liquid phase of cup part is decreased,and microstructure uniformity is improved increasingly with the increase of plunger preheating temperature.The minimal segregation degree is 14.02% with plunger preheating temperature at 400 ℃.

关 键 词：半固态 流变挤压铸造 7075合金 组织均匀性 液相偏析度 

分 类 号：TG249.2[金属学及工艺—铸造]