Journal
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
Volume 49, Issue 9, Pages 1500-1509Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.ijthermalsci.2010.04.011
Keywords
Solidification; Macrosegregation; Mesosegregates; Thermosolutal convection; Steel ingots; Casting
Categories
Funding
- Alcan CRV
- ArcelorMittal - Industeel Creusot
- Ascometal CREAS
- Aubert Duval
- Erasteel
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The influence of the thermosolutal convection of the liquid steel in the solidifying core of a 3.3-ton ingot on the formation of banded mesosegregates is investigated by a multiscale solidification model. We first show how the thermosolutal flow structure in the solidifying core depends on the relation between the interacting thermal and solutal buoyancy forces and the coupling by the phase-change kinetics. We further show that banded mesosegregates are triggered by instabilities of the solidification front, that their location is determined by flow instabilities, and that their A or V orientation depends on the global direction of the flow circulation. Moreover, the results show that local remelting is not necessary to develop a channel mesosegregate. Destabilization of the mushy zone with local variations of the solidification velocity is sufficient. (C) 2010 Elsevier Masson SAS. All rights reserved.
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