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为了提高铸坯凝固组织的均匀性,减轻宏观偏析,提出了自耗式振动激发金属液形核技术。当振动钢带喂入钢液时,保护渣有可能随之卷入,为此开展了传热数值模拟研究。通过试验可知,对于50 mm×5 mm的钢带,运动状态下过热度为10℃时,喂入速度小于0.36 m/min时下缘中心点的温度能够稳定在钢带的液相线温度以上;当喂入速度小于0.102 m/min时,位于钢渣界面2 mm以上的钢带窄边表面中心点的温度通过轴向传热能够达到或超过保护渣的熔化温度,此时钢带附近的保护渣有可能呈熔融状态,因此不会被带入钢液内。
In order to improve the homogeneity of the solidified slab and reduce the macrosegregation, a consumable vibration-induced metal liquid nucleation technique was proposed. When the vibrating steel strip is fed into the molten steel, the mold powder may be entangled. Therefore, the numerical simulation of heat transfer is carried out. The experiment shows that for 50 mm × 5 mm strip, when the superheat is 10 ℃ and the feed speed is less than 0.36 m / min, the center of the lower edge can stabilize above the liquidus temperature of the strip. When the feeding speed is less than 0.102 m / min, the temperature at the center point of the narrow side surface of the strip located above 2 mm of the slag interface can reach or exceed the melting temperature of the mold flux by axial heat transfer. At this time, It may be molten and will not be carried into the molten steel.