返回料及精炼工艺对A356铝合金净化效果的影响  

Influence of Recycled Material and Refining Process on Purification of A356 Aluminum Alloy

作　　者：程颖 洪涛[1] 魏怀远 韩尚伟 马晗雨 张花蕊 张虎 Cheng Ying;Hong Tao;Wei Huaiyuan;Han Shangwei;Ma Hanyu;Zhang Huarui;Zhang Hu(Ningbo Instituteof Technology,Beihang University;Research Institute for Frontier Science,Beihang University)

机构地区：[1]北京航空航天大学宁波创新研究院,北京100191 [2]北京航空航天大学前沿科学技术创新研究院,北京100191

出　　处：《特种铸造及有色合金》2022年第11期1325-1330,共6页Special Casting & Nonferrous Alloys

基　　金：宁波市科技创新2025重大专项基金资助项目(2020Z032);北京航空航天大学青年拔尖人才支持计划(YWF-22-L-1284)。

摘　　要：研究了返回料添加比例对A356铝合金夹杂物尺寸、含量的影响,通过力学性能测试,分析了返回料的添加对A356铝合金力学性能稳定性的影响,并研究了旋转喷吹精炼工艺参数对铝液密度、夹杂物尺寸和含量的影响。结果表明,随着返回料比例增加,合金中夹杂物尺寸增大、含量增加,合金力学稳定性下降。通过适当增加转子转速和气体流量、设置合适的气体压力,可以提高除气、除杂效率。添加30%返回料的A356铝合金熔体的最佳精炼工艺参数:转子转速为550 r/min,气体压力为0.8 MPa,气体流量为20 L/min。在此工艺参数条件下,铝液密度可以达到2.657 g/cm~3,夹杂物体积分数可降低至0.08%,铝液纯净度满足生产要求。The influence of recycled material proportion on the size and content of inclusion in A356 aluminum alloy was investigated. Effects of recycled material addition on the stability of mechanical properties were analyzed by mechanical property test, and influence of rotary injection refining process parameters on density, inclusion size and content of aluminum melt were analyzed. The results indicate that with increase of recycled material proportion, the size and content of the inclusions in the alloy are increased, and the mechanical performance stability is decreased. The efficiency of degassing and impurity removal can be improved by properly increasing the rotation speed and gas flow or setting appropriate gas pressure. For A356 aluminum alloy melt with 30% recycled material, the optimized refining process parameters present as follows: Rotor speed of 500 r/min, gas pressure of 0.8 MPa and gas flow of 20 L/min. On this condition, the aluminum melt density can reach 2.657 g/cm~3, and the volume fraction of inclusions can be decreased to 0.08%, satisfying production requirement.

关 键 词：A356铝合金 返回料 熔体净化 精炼工艺 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TF114[金属学及工艺—金属材料]