静置对A356.2铝液化学成分、力学性能及显微组织的影响  

The Effect of Aluminum-Liquid Holding on the Chemical Composition,Mechanical Properties and Microstructure of A356.2 Aluminum Alloy

作　　者：武汉琦 白帮伟 吴群虎 阿拉腾 王佶 谢理明 

机构地区：[1]中信戴卡股份有限公司,河北秦皇岛066011

出　　处：《铸造》2016年第7期653-657,共5页Foundry

摘　　要：本试验中对比了静置炉与塔式熔炼炉对A356．2铝合金液质量的影响，探究了获得高质量铝液的最佳静置处理时间。结果表明，经过静置处理后，与塔式熔炼炉内铝液相比，静置炉内各位置铝液成分更加均匀，温度分层现象得以改善，试棒伸长率相对于塔式熔炼炉内铝液试棒提升了12％。最佳静置时间确定为40min，铝液静置40min后，铝液化学成分均匀，元素烧损量小；温度分布均匀，铝液顶层与底层之间温差稳定在15-20℃度内，试棒力学性能最优，晶粒细化效果好，变质完全。The A356.2 aluminum alloy liquid qualities in the holding furnace and the melting furnace were compared in this paper and the best holding time for the aluminum alloy liquid was also studied. The results show that, compared with the melting furnace, the chemical composition of each position in the holding furnace is more uniform, the temperature stratification has been improved in the holding furnace and the elongation of the corresponding casting rod increased by 12%. The best holding time is 40 min. With 40 min after holding, the uniform chemical composition of the aluminum alloy liquid, less amount of burning elements and stable temperature stratification at 15-20 ℃ between upper layer and bottom can be observed. The cast rods achieved the best mechanical properties with small grain sizes and modified completely.

关 键 词：A356.2合金 静置炉 塔式熔炼炉 化学成分 显微组织 

分 类 号：TG292[金属学及工艺—铸造]