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

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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https://hal.univ-lorraine.fr/hal-02381381
Contributor : Miha Založnik <>
Submitted on : Tuesday, November 26, 2019 - 3:44:12 PM
Last modification on : Monday, April 6, 2020 - 2:44:05 PM

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Knut Omdal Tveito, Akash Pakanati, Mohammed M’hamdi, Hervé Combeau, Miha Založnik. A Simplified Three-Phase Model of Equiaxed Solidification for the Prediction of Microstructure and Macrosegregation in Castings. Metallurgical and Materials Transactions A, Springer Verlag/ASM International, 2018, 49 (7), pp.2778-2794. ⟨10.1007/s11661-018-4632-1⟩. ⟨hal-02381381⟩

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