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  

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

作　　者：李廷举[1] 佐佐健介[2] 浅井滋生[2] 

机构地区：[1]大连理工大学,大连116023 [2]名古屋大学

出　　处：《金属学报》1997年第9期971-975,共5页Acta Metallurgica Sinica

摘　　要：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％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.

关 键 词：连续铸造 振纹 铸坯 表面质量 电磁场 间断磁场 

分 类 号：TG249.7[金属学及工艺—铸造]