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间断高频磁场作用下连铸铸型内金属液的运动和铸坯的表面质量Ⅱ.金属液的运动特性

李廷举 , 佐佐健介 , 浅井滋生

金属学报

借助于光纤摄像机观测了钢液的模拟物─—液体Ga和铸型之间的接触状态,研究了间断接触距离(表征接触状态的星)和磁场间断频率的依存关系,进行了间断磁场作用下液体金属共振运动的理论分析在分别加间断磁场和连续磁场的条件下,进行了Sn的连续铸造模拟实验当间断频率f1接近于实验系统的固有频率时,金属液产生共振运动使弯月面和铸型之间的间断接触距离增大,金属液缓冷却效果相对较好和连续磁场对比,间断磁场能更有效地抑制铸型振动引起的液面运动,在获得同等表面质量铸坯的情况下,可以节省电力50%-70%

关键词: 连续铸造 , oscillation mark , surface quality of cast metal , electromagnetic field

EFFECT OF INTERMITTENT HIGH FREQUENCY MAGNETIC FIELD ON INITIAL SOLIDIFICATION IN CONTINUOUS CASTING

T. J. Li(Dalian University of Technology , Dalian 116923 , China)K. Sassa and S. Asai(Nagoya University , Nagoya 464-01 , Japan)

金属学报(英文版)

Contacting state between molten metal and a mold and initial solidification process of continuously cast metals can be controlled by imposing an intermittent magnetic field.In this study, effect of the intermittent magnetic field on the initial solidification ofcontinuoasly cast metals was investigated by measuring the temperature distribution in the melt pool and the initial solidification starting position of shells. It was found that under the condition with intermittent magnetic field, the melt near meniscns is in slow cooling state, the initial solidification starting position descends, initial solidification shell thickens and the liquid-solid interface becomes smooth.

关键词: continuous casting , null , null , null

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