Al Concentration Gradient Research Articles

The dissolution of deoxidizer into molten iron was studied.The distribution of added element in the intermediate layer after solidification was greatly varied with the rate of cooling.Owing to the difference of density between inclusions and matrix, inclusions migrated during their formation and also solidification of the melt.Accordingly, the composition of inclusion varied with the change of concentration of deoxidizer in matrix, but was not exactly in equilibrium with that of matrix containing. It is well known that by the addition of solid Al-Fe alloy containing above 0.3%AI, oxide inclusions formed dendrite clusters.On the other hand, by the addition of molten AI-Fe alloy containing below 2%AI at1600and1800°Cinclusions formed ordinary cloud cluster but not dendrite cluster.The formation of dendrite cluster is assumed to be caused by the orientated coagulation of oxide inclusions induced by some factors such as Al concentration gradient or temperature gradient being present in molten iron.

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