MOTION OF MELT IN CONTINUOUS CASTING MOLD AND SURFACE QUALITY OF INGOT UNDER INTERMITTENT HIGH FREQUENCY MAGNETIC FIELD II. Character of the Motion of Melt
LI Tingju(Dalian University of Technologr; Dalian 116023); SASSA Kensuke; ASAI Shigeo (Nagoya University; Nagoya 464-01; Japan)
Cite this article:
LI Tingju(Dalian University of Technologr; Dalian 116023); SASSA Kensuke; ASAI Shigeo (Nagoya University; Nagoya 464-01; Japan). MOTION OF MELT IN CONTINUOUS CASTING MOLD AND SURFACE QUALITY OF INGOT UNDER INTERMITTENT HIGH FREQUENCY MAGNETIC FIELD II. Character of the Motion of Melt. Acta Metall Sin, 1997, 33(9): 971-975.
Abstract Surface quality of continuously cast metals can be improved by imposing an intermittent high frequency magnetic field from the outside of a mold. The contacting state between a molten gallium, adopted as a simulator of a molten steel, and the mold was visualized by use of an optical fiberscope camera, the relationship between the intermittent contacting distance (representing contacting state), d, and intermittent frequency,f1 was investigated and the theoretical analysis of the melt motion under the intermittent magnetic field was conducted. Moreover, the molten tin was continuously cast under the conditions imposing intermittent and continuous magnetic field. It was found that when f1 is close to the intrinsic frequency of the experimental system, the intermittent contacting distance increases due to resonance motion of the molten metal. Under the condition of imposing intermittent magnetic fieId, the meniscus motion generated by mold oscillation can be effectively suppressed and electric current required to get the same surface quality is equal to 30%-50% of that of imposing continuous magnetic field.
