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Macrosegregation prediction in a 65 ton steel ingot

Abstract : The influence of hot-topping conditions on macrosegregation in a large industrial steel ingot is experimentally and numerically studied. Two types of insulating refractory materials are considered in the hot top - isothermic (classical hot topping) and exothermic. Unlike the isothermic material, the exothermic material releases heat into the solidifying ingot by an exothermic chemical reaction taking place during a certain period. Experimental macrosegregation and grain size at the central axis in a 6.2-ton industrial steel ingot are presented for the two hot top conditions. Thereafter, numerical studies using a multiscale model and confrontation between the experimental and numerical results are presented. In the multiscale model, the grain growth model is fully coupled with a volume-averaged two-phase macroscopic solidification model that takes into account macroscopic fluid flow, grain transport, heat transfer, and solute transport. The effects of the two hot top scenarios on the heat transfer behaviour, macrostructure and the macrosegregation are discussed. We have found that the insulating refractory material in the hot top plays an important role in the grain formation with exothermic refractory material resulting in a finer axial grain structure with more globular grain morphology and more macrosegregation. The model results well explain the experimental results for the two hot top scenarios. The exothermic chemical reaction can increase the number of nuclei, which in turn influences the grain structure and the macrosegregation in the ingot.
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https://hal.univ-lorraine.fr/hal-01709472
Contributor : Miha Založnik <>
Submitted on : Thursday, February 15, 2018 - 8:49:05 AM
Last modification on : Thursday, February 25, 2021 - 11:04:56 AM

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  • HAL Id : hal-01709472, version 1

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Hervé Combeau, Arvind Kumar, Miha Založnik, Isabelle Poitrault, Gilbert Lacagne, et al.. Macrosegregation prediction in a 65 ton steel ingot. International Conference on Ingot Casting, Rolling and Forging, 2012, Aachen, Germany. pp.27. ⟨hal-01709472⟩

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