The macrosegregation formation in an ingot and the influence of rotating mould upon it were analysed on the basis of interdendritic flow.When the ingot mould rotates unidirectionally,the centrifugal volume force acts on all inner parts,and when the ingot mould rotates alternately, the tangential alternate force is also formed,and both have various influences on the different modes of interdendritic flow.It is shown that as the ingot mould rotates unidirectionally or alternately with a moderate angular speed,the interdendritic unstable flow may be controlled effectively and the formation of segregation may be restrained.Thus,it seems to be significant for reducing the segregation such as A-type etc.,in the steel ingot.
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