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

来源 :Transactions of Nonferrous Metals Society of China | 被引量 : 0次 | 上传用户:esinstra
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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. 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 has developed. A three-dimensional finite element computational model of A-EMDC casting process was established by 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. annulus gap is advantageous to increasing circulate flow, reducing the temperature gradient as well as shallowing liquid sump depth. microstructure obtained by A-EMDC is globular or rosette-like, and the microstructure is homogeneous in the billet.
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