压铸工艺参数和冷却速度对B390铝合金表面贫硅区的影响  

Influence of Die-casting Process Parameters and Cooling Rates on the Surface Silicon-depleted Zone of B390 Aluminum Alloy

作　　者：张奥健 徐春 陈惠芬 叶兵[3] ZHANG Aojian;XU Chun;CHEN Huifen;YE Bing(College of Mechanical Engineering,Shanghai Institute of Technology,Shanghai 201418,China;College of Materials Science and Engineering,Shanghai Institute of Technology,Shanghai 201418,China;National Engineering Research Center of Light Alloy Net Forming,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海应用技术大学机械工程学院,上海201418 [2]上海应用技术大学材料科学与工程学院,上海201418 [3]上海交通大学轻合金精密成型国家工程研究中心,上海200240

出　　处：《上海金属》2019年第1期51-55,共5页Shanghai Metals

基　　金：国家重点研发计划(No.2016YFB0301001)

摘　　要：以B390铝合金为研究对象,采用高压铸造法制备压铸试棒。通过凝固过程模拟和金相试验表征与统计,分析浇注温度、压射压力、压射速度等压铸工艺参数对压铸件表面贫硅区的影响。采用AnyCasting软件模拟压铸件的充型和凝固过程,确定3种典型冷却速度的位置并取样,结合压铸工艺参数研究和试验分析,发现:压铸件表面贫硅区的厚度随着浇注温度的升高而减小,随着压射速度和冷却速度的增加而增加,压射压力对其影响较小;在压射压力为85MPa,浇注温度为740℃和压射速度为1 m/s时,压铸件表面贫硅区的厚度最小,有利于提高其耐磨性能。Test bars of the B390 aluminum alloy were made through high pressure die casting(HPDC).The influence of HPDC processing parameters(pouring temperature,injection pressure,and injection speed)on the surface silicon-depleted zone(SDZ)of die-cast part was investigated through solidification process simulation,optical micrograph characterization and statistical analysis on test bars.Three typical locations with different cooling rates were identified for sampling by simulation of the filling and solidification process using AnyCasting software.Combining the HPDC parameters study and experimental analysis,it was found that the thickness of SDZ decreased with the increase of pouring temperature,increased with the increase of injection speed and cooling rate,and was less affected by the variation of injection pressure.The minimal thickness of SDZ was obtained at the pouring temperature of 740℃,injection pressure of 85 MPa and injection speed of 1 m/s,which was beneficial to the improvement in wear resistance of die-cast part.

关 键 词：铝合金压铸件 模拟 压铸工艺参数 贫硅区 

分 类 号：TG249.2[金属学及工艺—铸造]