Abstract Soft-contact of molten steel can be achieved by applying a high-frequency electromagnetic field above the mold of continuous casting, which can effectively eliminate surface defects and achieve billets with no cracks and no oscillation marks. It also has some influence on the mold flux. In this study, the effect of a high-frequency electromagnetic field (20 kHz) on a mold flux flow field was simulated using a finite element software, and the slag film was extracted using a slag film simulator. The effect of the high-frequency magnetic field on the microstructure of the mold flux was analyzed using X-ray diffraction, Raman spectroscopy, and mineral phase testing. The results show that the high-frequency electromagnetic field disrupts the orderly movement and increases the movement rate of the liquid flux. The precipitate phase of the slag film did not change, but the silicate dimer Q 1 decreased, the chain Q 2 increased, and the network degree was increased. The slag film structure changed from the original two-layer form of crystalline layer–glass layer into a three-layer form of crystal layer–glass layer–crystal, and the crystallization ratio increased by 35% on average. The grain-size melilite granularity was reduced from the original 0.12 to 0.005 mm.

中文翻译：

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高频电磁场对保护渣微观结构的影响

摘要 通过在连铸结晶器上方施加高频电磁场，可以实现钢水的软接触，可有效消除表面缺陷，获得无裂纹、无振痕的钢坯。它还对模具助焊剂有一些影响。在本研究中，使用有限元软件模拟高频电磁场（20 kHz）对结晶器熔剂流场的影响，并使用渣膜模拟器提取渣膜。使用 X 射线衍射、拉曼光谱和矿物相测试分析了高频磁场对保护渣微观结构的影响。结果表明，高频电磁场扰乱了有序的运动，增加了液体通量的运动速度。渣膜的析出相没有变化，但硅酸盐二聚体Q 1 减少，链状Q 2 增加，网络度增加。渣膜结构由原来的结晶层-玻璃层的两层形式转变为结晶层-玻璃层-晶体的三层形式，结晶率平均提高了35%。晶粒度黄长石粒度由原来的0.12mm降低到0.005mm。