Efeito da nucleação de grãos nas previsões do modelo multifásico para a solidificação equiaxial. / Effects of grain nucleation on the predictions of the multiphase model for equiaxed solidification.

AUTOR(ES)

Francisco Lameiras Júnior

DATA DE PUBLICAÇÃO

2006

RESUMO

A multiphase mathematical model for the equiaxed solidification of binary alloys was proposed in the present work to predict the effects of the cooling rate and the average solute concentration on the final average grain size. The mathematical model was based on the concept of the grain envelope and on the conservation of energy, mass and chemical species. A nucleation model was adopted to consider the nucleation of new grains during the whole solidification time. The differential equations were derived from the volume average of conservation equations within a representative elementary volume that consisted of three pseudophases: solid, interdendritic liquid, and extradendritic liquid. The effect of some processing variables on the final average grain size was studied. The results from the proposed model were compared with those available in the literature from other models.

ASSUNTO(S)

multiphase mathematical model modelo multifásico equiaxed solidification nucleação contínua continuous nucleation solidificação equiaxial

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