外加电磁场对半连续铸造7075铝合金宏观偏析规律的影响  

Effect of Electromagnetic Field on Macrosegregation of Continuous Casting 7075 Aluminum Alloy

作　　者：张北江[1] 崔建忠[1] 路贵民[1] 张勤 

机构地区：[1]东北大学材料电磁过程研究教育部重点实验室,辽宁沈阳110004

出　　处：《东北大学学报（自然科学版）》2002年第10期968-971,共4页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目 ( 59974 0 0 9);国家重点基础研究发展规划项目 (G19990 6 490 1)

摘　　要：研究了外加电磁场在直径 2 0 0mm 70 75铝合金圆锭半连续铸造过程中对合金元素宏观偏析规律的影响·分别在 10 0～ 60 0A和 10～ 10 0Hz范围内调节感应线圈中交变电流的强度和频率 ,通过电磁铸造工艺制得 70 75铝合金圆锭·采用化学分析的方法测定合金元素沿铸锭半径方向的分布情况·结果表明 ,采用电磁铸造工艺能够有效抑制宏观偏析 ;在保持线圈电流强度不变的情况下 ,电磁场频率的改变显著地影响了合金元素的分布情况 ,其中频率为 3 0Hz时消除宏观偏析的效果最佳·aluminum alloy ingot of 200?mm diameter was produced by electromagnetic casting process. The influence of electromagnetic field on macrosegregation of continuous casting aluminum alloy was studied. Magnitude of coil current to produce the electromagnetic field is varied from 100?A to 600?A and frequency from 10?Hz to 100?Hz. Variation of solute content along the radius of the ingot was examined by means of chemical analysis. The results show that electromagnetic casting process can effectively decrease macrosegregation. Electromagnetic frequency has a great influence on solute distribution along the radius of ingot. When frequency is 30?Hz, macrosegregation is eliminated completely.

关 键 词：电磁场 半连续铸造 宏观偏析 铝合金 电磁场频率 

分 类 号：TG249.7[金属学及工艺—铸造]