Abstract
Several Fe-25 wt% Ni alloy foils were processed through levitation melting and splat-cooling. The microstructural variation observed within the same or different foils was attributed to the large number of combinations of processing variables the most important of which are: dropping temperature, platen velocity and platen surface conditions. In foils obtained by splat-cooling superheated droplets the fine rod-like dendritic structure is usually asymmetrical with respect to the center-plane of the foil and microsegregation is very low. In foils obtained by splat-cooling highly undercooled droplets the bulk undercooled fine rod-like dendritic structure is also asymmetrical with respect to the center-plane of the foil. In the central zone of the specimen a number of high nickel-cored dendrites is embedded in a high nickel matrix which is equiaxed or locally columnar dendritic. The formation of this highly segregated structure may be attributed to the interaction between undercooling, fast cooling and intense fluid flow.
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