Modeling of the influence of hot top design on microporosity and shrinkage cavity in large-size cast steel ingots

Ghodrati, Neda, Loucif, Abdelhalim, Morin, Jean -Benoit et Jahazi, Mohammad. 2022. « Modeling of the influence of hot top design on microporosity and shrinkage cavity in large-size cast steel ingots ». In 8th International Congress on the Science and Technology of Steelmaking (Montreal, QC, Canada, Aug. 02-04, 2022) pp. 239-244. Association for Iron & Steel Technology.

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Résumé

The effect of the variations in different hot top designs on the risk of microporosity and shrinkage cavity formation during solidification of a 12MT cast ingot made of a Cr-Mo-low-alloy steel was investigated. Three-dimensional finite element modeling code THERCAST® was used to simulate the thermomechanical phenomena associated with the various phases of mold filling and cooling in and out of the mold in the solidification process. Prediction results were validated by comparison between the simulation results and experimental measurement of chemical composition in different locations of the ingot and depth of shrinkage cavity. The influence of the increase in the hot top height, increase in both the hot top height and sideboard, and insert of sideboard on solidification time, liquid fraction, molten metal pool dimensions, and liquid feeding were determined. Results revealed that variation in the hot top geometry and hot top insulation increased the solidification time, changed the height and width of the molten metal pool, and modified the solidification behavior. The simulation results also showed that the centerline shrinkage porosity, as well as microporosity throughout the ingot volume, could be reduced by changes in the hot top design.

Type de document:	Compte rendu de conférence
Professeur:	Professeur Jahazi, Mohammad
Affiliation:	Génie mécanique
Date de dépôt:	14 oct. 2022 16:21
Dernière modification:	07 nov. 2022 15:18
URI:	https://espace2.etsmtl.ca/id/eprint/25624

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