架空导线用中强铝合金轮带式连铸锭坯的组织  

Structure of the moderate-strength aluminum alloy for overhead conductors during the rotary-wheel casting process

作　　者：李林林 陈庆强[2] 罗风魁 王旭[2] 朱庆丰[2] 赵志浩[2] 

机构地区：[1]上海胜华电缆(集团)有限公司,上海200000 [2]东北大学材料电磁过程研究教育部重点实验室,辽宁沈阳110819

出　　处：《轻合金加工技术》2015年第3期28-31,40,共5页Light Alloy Fabrication Technology

基　　金：国家自然科学基金资助项目(51204053);中央高校基本科研项目(N130409005);中央高校基本科研项目(N130709001)

摘　　要：结合铝合金轮带式连铸工艺的特点,分析了铝架空导线用6101中强铝合金轮带式锭坯不同组织的成因。结果表明:轮带式连铸过程中梯形铸坯与结晶轮及钢带接触的四个面冷却速度快,易在梯形铸坯四个面附近形成枝晶网格比较细小的粗大柱状晶,而在冷却速率较慢的铸坯心部容易形成枝晶网格比较粗大的等轴晶。轮带式连铸铸造速度快、液穴深,在铸坯最后凝固的液穴处因补缩不足形成沿液穴中心水平分布的集中缩孔。For the moderate-strength 6101 aluminum alloy billets, the cause of formation mechanism of different structure was analyzed considering the characteristics of the rotary- wheel casting process. The results show that coarse columnar grains with fine secondary dendrite are easily formed near four edges of the trapezoidal billet for the high cooling rate in this area,which has contact with the wheel and the steel belt. While big equiaxed grains with coarse secondary dendrite are easily formed in the center of the trapezoidal billet for the low cooling rate in this area. In the final solidification area of the liquid sump center, shrinkage cavities are easily formed and horizontally distributed along the center of the billet for the feeding difficulties in the deep sump shape during the rotary wheel casting process.

关 键 词：铝合金 轮带式连铸 架空导线 铸态组织 

分 类 号：TG292[金属学及工艺—铸造]