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Microstructure characterization and transition of undercooled Fe–7.5at% Ni melt were investigated, adopting melt fluxing and cyclical overheating. For the samples subjected to low undercoolings, single-phase microstructure results, whereas many second-phase particles, which are deemed as the so-called dendrite core originating from the primary solidification of the metastable δ phase, were observed...
The microstructure evolution of undercooled Fe-7.5at% Ni melt was investigated by fluxing and cyclic superheating. Within the undercooling, ΔT, range achieved, two kinds of grain refinement and one grain coarsening occur and different as-solidified morphologies result. The first grain refinement, occurring if ΔT<56K, can be ascribed to the breakup of dendrite-skeleton owing to remelting, whereas...
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