Abstract
A series of experiments were performed to investigate the interface morphology, solute distribution and formed phase of Fe-5 wt.%Mn alloy during directional solidification at withdrawal velocities ranging from 2µm/s to 50µm/s. The withdrawal velocities of planar interface instability and cell-to-dendrite transformation were about 6µm/s and 10µm/s, respectively. The cellular/dendrite spacing and mushy zone length increased firstly as increasing withdrawal velocities and then decreased after 30µm/s, which was related to the solute enrichment and increase of the temperature gradient. The manganese enriched in solid-liquid interface frontier very seriously. The phase detected in Fe-5wt.%Mn was always BCC regardless of the withdrawal velocity changing.
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