Elsevier

Journal of Crystal Growth

Volume 183, Issue 3, 2 January 1998, Pages 469-489
Journal of Crystal Growth

General subject
Effects of gravity on columnar dendritic growth of metallic alloys: flow pattern and mass transfer

https://doi.org/10.1016/S0022-0248(97)00415-6Get rights and content

Abstract

Simple rules are proposed for the prediction of segregation effects due to natural convection in the mushy zone during directional solidification in the columnar dendritic regime. The study is based on a scaling analysis of the mass and solute transport coupled with an interpretation of the results of previous experiments performed by the authors in different orientations relative to gravity and in microgravity. Natural flow effects in the mush are shown to be controlled by a unique dimensionless group and a method to build microstructure maps is proposed, which accounts for natural convection. Satisfactory agreement is found between the predicted scaling laws and the longitudinal macrosegregations measured in our experiments. The influence of natural convection on primary spacing will be considered in a forthcoming paper.

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