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Metallurgical and Materials Transactions A
Published in: Metallurgical and Materials Transactions A 7/2018

19-04-2018

A Simplified Three-Phase Model of Equiaxed Solidification for the Prediction of Microstructure and Macrosegregation in Castings

Authors: Knut Omdal Tveito, Akash Pakanati, Mohammed M’Hamdi, Hervé Combeau, Miha Založnik

Published in: Metallurgical and Materials Transactions A | Issue 7/2018

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Abstract

Macrosegregation is a result of the interplay of various transport mechanisms, including natural convection, solidification shrinkage, and grain motion. Experimental observations also indicate the impact of grain morphology, ranging from dendritic to globular, on macrosegregation formation. To avoid the complexity arising due to modeling of an equiaxed dendritic grain, we present the development of a simplified three-phase, multiscale equiaxed dendritic solidification model based on the volume-averaging method, which accounts for the above-mentioned transport phenomena. The validity of the model is assessed by comparing it with the full three-phase model without simplifications. It is then applied to qualitatively analyze the impact of grain morphology on macrosegregation formation in an industrial scale direct chill cast aluminum alloy ingot.
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Metadata
Title
A Simplified Three-Phase Model of Equiaxed Solidification for the Prediction of Microstructure and Macrosegregation in Castings
Authors
Knut Omdal Tveito
Akash Pakanati
Mohammed M’Hamdi
Hervé Combeau
Miha Založnik
Publication date
19-04-2018
Publisher
Springer US
Published in
Metallurgical and Materials Transactions A / Issue 7/2018
Print ISSN: 1073-5623
Electronic ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-018-4632-1

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