本文研究了宏观偏析的形成过程及锭模旋转对偏析的影响。铸锭单向旋转时,其内部各点受到离心体积力的作用;交变旋转不仅产生离心力,而且形成切向交变力。两者均对不同类型的枝晶间液相流产生不同影响。实验表明,锭模以适当的转速旋转能有效地控制枝晶间非稳定流,抑制沟槽偏析的形成,对减轻诸如钢锭中A型偏析等有实际意义。
The macrosegregation formation in an ingot and the influence of rotat-ing mould upon it were analysed on the basis of the interdendritic flow. When theingot mould rotates unidirectionally, the centrifugal volume force acts on all innerparts and when the ingot mould rotates attenately, the tangential alternate force isalso formed, and both have various influences on the different modes of interden-dritic flow. It is shown that as the ingot mould rotates unidirectionally or alterna-tely with moderate angular speed, the interdendritic unstable flow may be control-led effectively and the formation of segregation may be restrained. Thus, it seemsto be significant for reducing the segregation such as A-type, etc., in the steel in-got.
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