Direct chill casting with reversing rotational electromagnetic field

9th International Symposium on Electromagnetic Processing of Materials

材料科学;物理学

Shimasaki, S.^1 ; Minagawa, A.^2

National Institute of Technology, Kagawa College, 355 Chokushi-cho, Takamatsu, Japan^1

UACJ Corporation, 3-1-12 Chitose, Minato-ku Nagoya, Japan^2

关键词: Cylindrical containers;    DC casting;    Electromagnetic analysis;    Electromagnetic stirring;    Grain size refinement;    reversing RMF;    Solidification process;    Turbulent intensities;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/424/1/012055/pdf
DOI  :  10.1088/1757-899X/424/1/012055

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

In order to achieve higher qualities of aluminum metal products, fine grain structures of materials are required. It is well known that agitation of a liquid metal during solidification process is effective to promote grain size refinement. In this research, the reversing RMF, i.e., the RMF that reverses rotation direction of an electromagnetic field at regular intervals, was applied to a molten metal pool in a cylindrical container of a round billet of DC casting. Electromagnetic fields generated by the reversing RMF stirrer were measured and compared with simulation results of electromagnetic analysis. The molten metal in the pool caused a clockwise and a counter-clockwise flow by applying the reversing RMF, and the flow field was simulated by a CFD calculation. It was found that the liquid metal was effectively stirred with the reversing RMF, resulting a higher turbulent intensity of the liquid metal. Grain sizes of a billet were measured and a relation between the flows and the sizes were investigated.