New method of direct chill casting of Al-6Si-3Cu-Mg semisolid billet by annulus electromagnetic stirring  

作　　者：汤孟欧 徐骏 张志峰 白月龙 

机构地区：[1]General Research Institute for Nonferrous Metals

出　　处：《Transactions of Nonferrous Metals Society of China》2010年第9期1591-1596,共6页中国有色金属学报（英文版）

基　　金：Project(2009AA03Z534) supported by the National Hi-tech Research and Development Program of China;Project(2006CB605203) supported by the National Basic Research Program of China

摘　　要：The electromagnetic direct chill （EMDC） casting process is a welt-established production route for aluminum alloy ingot, however, the skin effect restricts the casting diameter. In order to avoid this problem, annulus electromagnetic direct chill （A-EMDC） casting process has been developed. A three-dimension finite element computational model of A-EMDC casting process was established by using ANSYS Magnetic-Nodal programs and FLOTRAN CFD programs. Microstruetures of A-EMDC casting semi-solid Al-6Si-3Cu-Mg alloy billets were investigated. Two pairs of vortexes occur within the crystallizer with opposite direction in A-EMDC. The annulus gap is advantageous to increasing circulate flow, reducing the temperature gradient as well as shallowing liquid sump depth. The microstructure obtained by A-EMDC is globular or rosette-like, and the microstructure is homogeneous in the billet.The electromagnetic direct chill (EMDC) casting process is a well-established production route for aluminum alloy ingot, however, the skin effect restricts the casting diameter.In order to avoid this problem, annulus electromagnetic direct chill (A-EMDC) casting process has been developed.A three-dimension finite element computational model of A-EMDC casting process was established by using ANSYS Magnetic-Nodal programs and FLOTRAN CFD programs.Microstructures of A-EMDC casting semi-solid Al-6Si-3Cu-Mg alloy billets were investigated.Two pairs of vortexes occur within the crystallizer with opposite direction in A-EMDC.The annulus gap is advantageous to increasing circulate flow, reducing the temperature gradient as well as shallowing liquid sump depth.The microstructure obtained by A-EMDC is globular or rosette-like, and the microstructure is homogeneous in the billet.

关 键 词：electromagnetic stirring SEMI-SOLID continuous casting Al-6Si-3Cu-Mg alloy 

分 类 号：TG249.9[金属学及工艺—铸造] TB331[一般工业技术—材料科学与工程]