Deflection of Steel Dendrite Growing in the Fluid Flow Driven by Electromagnetic Stirrer

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  • ESAKA Hisao
    Technical Development Bureau, Nippon Steel Corp., now Department of Materials Science and Engineering, The National Defense Academy
  • TOH Takehiko
    Technical Development Bureau, Nippon Steel Corp.
  • HARADA Hiroshi
    Technical Development Bureau, Nippon Steel Corp.
  • TAKEUCHI Eiichi
    Technical Development Bureau, Nippon Steel Corp.
  • FUJISAKI Keisuke
    Technical Development Bureau, Nippon Steel Corp.

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Other Title
  • 移動磁界中を成長するデンドライトの偏向現象
  • イドウ ジカイ チュウ オ セイチョウ スル デンドライト ノ ヘンコウ ゲンショウ

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Abstract

In order to evaluate the flow velocity of molten steel driven by electromagnetic stirrer in the mold, not only deflection mechanism of dendrite due to fluid flow but also fluid dynamics promoted by Lorentz force have been taken into account. Deflection angle of dendrite in cross section have been analysed in various steels which have been cast with various width and promotive forces. The relation between deflection angle and promotive force is not well correlated (correlation factor: 0.63). It is found from the numerical analysis of fluid dynamics that the flow velocity increases with increasing width of stab, at a constant promotive force. Thus, promotive forces are normarized with respect to width. Since the deflection angle of steel dendrite is affected by carbon content, experimental data on deflection angle are also modified by carbon content. The relation between normarized promotive force and modified deflection angles is then quite well correlated (correlation factor: 0.97).<BR>Since the Lorentz force is a body one, the flow velocity (Us) can be simply derived. The ratio between flow velocity calculated from modified deflection angle and Us is approximately 0.4, which may be constant with usual casting condition of slab. This indicates that 60% of imposed electromagnetic force disappears due to the interaction of 3D flow, due to the interference between submerged entry nozzle etc.<BR>To estimate the flow velocity, it is important to take the effect of carbon content on deflection angle into consideration.

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 86 (4), 247-251, 2000

    The Iron and Steel Institute of Japan

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