电磁搅拌对镁合金铸锭宏观偏析的影响  

Effect of Electromagnetic Stirring on the Macrosegregation in Magnesium Alloy Ingots

作　　者：张成 徐世伟 唐伟能 谢玉 

机构地区：[1]宝山钢铁股份有限公司研究院,上海201900 [2]汽车用钢开发与应用技术国家重点实验室(宝钢),上海201900 [3]上海运输工具轻量化金属材料应用工程技术研究中心,上海201900

出　　处：《上海金属》2017年第5期67-70,共4页Shanghai Metals

摘　　要：研究了电磁搅拌对半连续铸造镁合金铸锭宏观偏析的影响。采用电磁铸造法制备了直径320 mm的AZ61镁合金铸锭,电磁搅拌施加电流为0~300 A,频率为15 Hz。利用化学分析法对比了不同电磁场强度下镁合金铸锭径向主要溶质元素的分布情况。结果表明,电磁搅拌可以有效改善镁合金铸锭主要溶质元素的分布,并且当施加电流强度为20~50 A时,铸锭径向元素偏析比明显减小,达到了改善镁合金铸锭宏观偏析的效果。电流强度超过100 A时,电磁场强度较大会引起熔体过搅现象,从而导致溶质元素偏析程度恶化。The influence of electromagnetic stirring on macrosegregation of semi-continuouly cast magnesium alloy was studied. The AZ61 magnesium alloy ingot 320 mm in diameter was produced by electromagnetic casting process. The stirring electric current was varied from 0 to 300 A at frequency of 15 Hz. The variation of solute content along the radius of ingot was examined by means of chemical analysis under different magnetic fields. The results showed that the electromagnetic stirring had a great influence on the improvement of solute distribution in the magnesium alloy ingot. Further,the segregation ratio along the radius of ingot was reduced obviously when the intensity of coil current was in the range from 20 A to 50 A,which can effectively improve the macrosegregation in magnesium alloy ingots. At current intensities higher than 100 A,the greater electromagnetic fields would cause the molten metal to be over-stirred,resulting in the worse macrosegregation of solute elements.

关 键 词：电磁搅拌 半连续铸造 镁合金 宏观偏析 

分 类 号：TG115.285[金属学及工艺—物理冶金]