Thermosolutal flow in steel ingots and the formation of mesosegregates |
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| Authors: | Miha Zalo?nik Hervé Combeau |
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| Affiliation: | 1. Department of Mechanical Engineering, Missouri University of Science and Technology, 65401, United States;2. Langley Research Center, National Aeronautics and Space Administration, Hampton, VA 23681, United States;1. Mechanics laboratory, University Amar Telidji of Laghouat, Algeria;2. SIMAP-EPM PHELMA, University of Grenoble Alpes, BP75, 38402 Saint Martin d’Hères Cedex, France;1. Institute of Metals and Technology, Lepi Pot 11, SI-1000, Ljubljana, Slovenia;2. Université de Lorraine, CNRS, IJL, F-54000, Nancy, France;3. Faculty of Mechanical Engineering, University of Ljubljana, A?ker?eva 6, SI-1000, Ljubljana, Slovenia;1. Mechanics Laboratory, University Amar Telidji of Laghouat, Algeria;2. University of Grenoble, SIMAP-EPM, BP 75, 38402 Saint Martin d''Hères Cedex, France;3. University of Chinese Academy of Sciences, Beijing, China |
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| Abstract: | 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. |
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