Horizontal continuous casting process under electromagnetic field for preparing AA3003/AA4045 clad composite hollow billets  

电磁场下AA3003/AA4045铝合金复层管坯水平连铸技术（英文）

作　　者：武立 康慧君[2] 陈宗宁[2] 刘宁[1] 王同敏[1] 

机构地区：[1]大连理工大学材料科学与工程学院三束材料改性教育部重点实验室,大连116024 [2]大连理工大学原材料特种制备技术实验室,大连116024

出　　处：《Transactions of Nonferrous Metals Society of China》2015年第8期2675-2685,共11页中国有色金属学报（英文版）

基　　金：Projects(51274054,U1332115,51271042,51375070,51401044)supported by the National Natural Science Foundation of China;Project(313011)supported by the Key Grant Project of Ministry of Education of China;Project(2013A16GX110);supported by the Science and Technology Planning Project of Dalian,China;Project(2014M551075);supported by the China Postdoctoral Science Foundation;Project supported by the Fundamental Research Funds for the Central Universities,China

摘　　要：A modified horizontal continuous casting process under the electromagnetic field was proposed for preparing AA3003/ AA4045 clad composite hollow billets. To investigate the effect of electromagnetic field on this process, a comprehensive three-dimensional model was developed. Two cases with and without electromagnetic field were compared using the simulations. When rotating electromagnetic stirring is applied, the flow pattern of fluid melt is greatly modified; the mushy zone becomes much wider, the temperature profile becomes more uniform, and the solid fraction decreases for both the external and internal alloy melt layers. These modifications are beneficial for the formation of a bimetal interface and fine and uniform grain structure of the clad composite hollow billet. Experiments conducted using the same electrical and casting parameters as the simulations verify that under the electromagnetic field the microstructure of the clad composite hollow billet becomes fine and the diffusion of the elements at the interface is promoted.采用数值模拟方法研究在电磁场下AA3003/AA4045铝合金复层管坯的水平连铸制备过程。为了考察电磁场对复层管坯水平连铸过程的影响,建立一个三维分析模型并对有无施加电磁场时的两个水平连铸过程分别进行全面地模拟与分析。数值模拟结果表明:施加旋转电磁搅拌后,铝合金熔体的紊流作用增强,糊状区的范围增大,糊状区的温度梯度减小且温度场变得均匀,铝合金熔体的固相率下降。这些改变有利于复层管坯组织的细化及复合界面元素的扩散。采用与数值模拟相同的工艺参数进行实验,结果证实在电磁场作用下复层管坯组织得到细化并且复合界面的元素扩散作用增强。

关 键 词：aluminum alloy clad composite hollow billet horizontal continuous casting electromagnetic stirring numerical simulation 

分 类 号：TG249.7[金属学及工艺—铸造]