Solidification modeling: from electromagnetic levitation to atomization processing

Prof. Charles-Andre Gandin

CEMEF, Mines De Paris,

Centre de mise en fome des materiaux, Sophia-Anitpolis

Abstract:

A segregation model for multiple phase transformations is presented together with solidification experiments using electromagnetic levitation. Comparison is made between predictions and measurements. Thanks to coupling with thermodynamic equilibrium calculations, as well as the treatment of dendritic, peritectic and eutectic reactions, quantitative agreement is found for the cooling curves and the fraction of microstructures measured, thus providing a validation of the kinetics of phase transformations. Application is then possible for the impulse atomization process. It reveals the importance of the competition between the various microstructures formed from the melt and the role of the nucleation and growth kinetics.