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A simplified three-phase model of equiaxed solidification for the prediction of microstructure and macrosegregation in castings

Tveito, Knut Omdal; Pakanati, Akash; M'hamdi, Mohammed; Combeau, Hervé; Založnik, Miha
Journal article
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Tveito (Locked)
URI
http://hdl.handle.net/11250/2609910
Date
2018
Metadata
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  • Institutt for materialteknologi [1570]
  • Publikasjoner fra CRIStin - NTNU [19849]
Original version
Metallurgical and Materials Transactions. A. 2018, 49 (7), 2778-2794.   10.1007/s11661-018-4632-1
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.
Publisher
Springer
Journal
Metallurgical and Materials Transactions. A

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