DC casting of light alloys under magnetic fields  

作　　者：崔建忠 张志强 乐启炽 

机构地区：[1]Key Laboratory of Electromagnetic Processing of Materials of Ministry of Education,Northeastern University

出　　处：《Transactions of Nonferrous Metals Society of China》2010年第11期2046-2050,共5页中国有色金属学报（英文版）

基　　金：Project(2005CB623707) supported by the National Basic Research Program of China; Projects(2007CB613701 and 2007CB613702) supported by the National Key Basic Research Program of China;Projects(50974037,51004032 and 50904018) supported by the National Natural Science Foundation of China;Project(NCET-08-0098) supported by the New Century Excellent Talents in University,Ministry of Education,China;Project(20100471468) supported by China Postdoctoral Science Foundation

摘　　要：The working principle of LFEC（Low frequency electromagnetic casting） process developed in Northeastern University, China was introduced and the metallurgical results of LFEC were discussed according to the casting practices. The low frequency field around the mold produces Lorenz force, which can be divided into two parts： one is the potential force which will be balanced by a pressure gradient of the liquid and results in the formation of a convex surface meniscus and improves the surface quality; the other is the rotary force which stirs the liquid in the mold to refine the microstructures and homogenize the distribution of alloying elements. LFEC can refine microstructures remarkably, improve surface quality of the ingots, depress macrosegregation and eliminate cracks. Some new technologies, such as horizontal direct chill casting under low-frequency electromagnetic field （HLEC）, DC casting of hollow billets under electromagnetic fields （HBEC）, electromagnetic modifying of hypereutectic A1-Si alloys（EMM）, air film casting under static magnetic field （AFCM）, and multi-ingots casting under low-frequency magnetic field （MLFEC） were developed based on LFEC.The working principle of LFEC(Low frequency electromagnetic casting) process developed in Northeastern University,China was introduced and the metallurgical results of LFEC were discussed according to the casting practices.The low frequency field around the mold produces Lorenz force,which can be divided into two parts:one is the potential force which will be balanced by a pressure gradient of the liquid and results in the formation of a convex surface meniscus and improves the surface quality;the other is the rotary force which stirs the liquid in the mold to refine the microstructures and homogenize the distribution of alloying elements.LFEC can refine microstructures remarkably,improve surface quality of the ingots,depress macrosegregation and eliminate cracks.Some new technologies,such as horizontal direct chill casting under low-frequency electromagnetic field(HLEC),DC casting of hollow billets under electromagnetic fields(HBEC),electromagnetic modifying of hypereutectic Al-Si alloys(EMM),air film casting under static magnetic field(AFCM),and multi-ingots casting under low-frequency magnetic field(MLFEC) were developed based on LFEC.

关 键 词：low frequency electromagnetic field light alloy DC casting grain refinement 

分 类 号：TG292[金属学及工艺—铸造]