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1. 发明申请

WO2009117803A1 MODULATED ELECTROMAGNETIC STIRRING OF METALS AT ADVANCED STAGE OF SOLIDIFICATION 审中-公开
标题翻译：在高级固化阶段金属的调制电磁搅拌
公开(公告)号：WO2009117803A1
公开(公告)日：2009-10-01
申请号：PCT/CA2008/001333
申请日：2008-07-22
申请人： ABB INC. , BEITELMAN, Leonid S. , LAVERS, J. Douglas , CURRAN, Christopher P. , TALLBACK, Gote
发明人： BEITELMAN, Leonid S. , LAVERS, J. Douglas , CURRAN, Christopher P. , TALLBACK, Gote
IPC分类号： B22D11/115 , B01F13/08 , B22D27/02
CPC分类号： B22D11/115 , B01F13/0809 , B22D11/122
摘要： A method and apparatus for electromagnetic stirring of molten metals at an advanced stage of solidification, as may be used in continuous casting of steel billets and blooms, are disclosed. At least first and second stirrers are provided for generating first and second rotating magnetic fields of a differing frequency about an axis of solidifying molten metal. The stirrers are arranged about the molten metal in sufficiently close proximity to each other so that their respective magnetic fields superpose to produce a modulated magnetic field. The magnetic fields of the respective stirrers may either have common or opposing rotational directions. The modulated stirring produced by the magnetic fields results in oscillating primary and secondary flows and hence turbulence within the melt bulk in the region wherein temperature of the melt on its central axis is below the liquidus level and at least 10% of substantially solidified material is formed. Turbulent flow created by this stirring method disrupts formation of crystalline structures in the melt bulk and mixes solute enriched melt of the central region with the bulk volume which subsequently results in improvements of the solidification structure and overall internal quality of the cast products.
摘要翻译：公开了一种用于在钢坯和花坯的连续铸造中可用于凝固的后期阶段的熔融金属的电磁搅拌的方法和装置。提供至少第一和第二搅拌器用于产生围绕凝固熔融金属的轴线的不同频率的第一和第二旋转磁场。搅拌器围绕熔融金属布置成彼此充分接近，使得其各自的磁场叠加以产生调制的磁场。各个搅拌器的磁场可以具有共同或相反的旋转方向。通过磁场产生的调制搅拌导致在熔体体积中的熔体体积中的振荡一次和二次流动，其中熔体在其中心轴上的温度低于液相线的水平，并形成至少10％的基本上固化的材料。通过该搅拌方法产生的湍流破坏了熔体体积中的晶体结构的形成，并将中心区域的富含溶质的熔体与本体体积混合，其随后导致铸造产品的凝固结构和整体内部质量的改善。

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