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The Coupling of Macrosegregation With Grain Nucleation, Growth and Motion in DC Cast Aluminum Alloy Ingots

Abstract : The phenomena responsible for the formation of macrosegregations, and grain structures during solidification are closely intertwined. We present a model study of the formation of macrosegregation and grain structure in an industrial sized (350 mm thick) direct chill (DC) cast aluminum alloy extrusion ingot. The modeling of these phenomena in DC casting is a challenging problem mainly due to the size of the products, the variety of the phenomena to be accounted for, and the nonlinearities. We used a volume-averaged multiscale model that describes nucleation on grain refiner particles and grain growth, coupled with macroscopic transport: fluid flow driven by natural convection and shrinkage, transport of free-floating globular equiaxed grains, heat transfer, and solute transport. We analyze the heat and mass transfer in the slurry moving-grain zone that is a result of the coupling of the fluid flow and the grain nucleation, growth and motion. We discuss the impact of the flow structure in the slurry zone and of the grain packing fraction on the macrosegregation.
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https://hal.univ-lorraine.fr/hal-01709476
Contributor : Miha Založnik <>
Submitted on : Thursday, February 15, 2018 - 8:49:12 AM
Last modification on : Thursday, February 25, 2021 - 11:04:56 AM

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  • HAL Id : hal-01709476, version 1

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Miha Založnik, Arvind Kumar, Hervé Combeau, Marie Bedel, Philippe Jarry, et al.. The Coupling of Macrosegregation With Grain Nucleation, Growth and Motion in DC Cast Aluminum Alloy Ingots. Light metals 2011, 2011, Warrendale (PA), USA, Unknown Region. pp.699--704. ⟨hal-01709476⟩

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