Abstract
AbstractSpace electromagnetic levitation processing allows investigations on the influence of convection on phase selection by leveraging the ability to process reactive molten metal alloys in a containerless fashion while selecting a broad range of flow conditions during rapid solidification. The ferrite-austenite transformation in FeCrNi stainless steel alloys involves an incubation delay between nucleation events, and this delay is seen to depend on both primary undercooling and melt shear. Quantification of the delay during double recalescence is successfully predicted using the Retained Damage Model. Dimensionless parameters describing the relationship between delay time, undercooling, and melt convection indicate that there is good agreement between theory and experimental results conducted using ground-based electrostatic and electromagnetic levitation and microgravity experiments using the ISS-EML facility.
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