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VERSION:2.0
METHOD:PUBLISH
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ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 19b
SUMMARY:Modelling the evolution of non-metallic inclusions during refining and casting by combining nucleation and thermodynamic-kinetic models 
DESCRIPTION:Non-metallic inclusions have critical effects on the properties and manufacturing process of steels. The amount, composition, morphology and size distribution of inclusions define the cleanliness of steel, which is the key to “clean steel”. In this work, a modelling framework for describing the evolution of amount, composition and size distribution of inclusions during refining and casting is established based on the thermodynamic-kinetic models and nucleation models. In order to calculate the evolution of size distribution of inclusions, the nucleation, growth and coarsening of inclusions are described by Kampmann-Wagner numerical model and the collisions and agglomerations are modelled by the population balance model. Both homogeneous and heterogeneous nucleation are accounted for. The model can be also employed to describe the evolution of inclusions during cooling and solidification by combining a solidification model. The models have been validated using both laboratory- and process-scale experimental data for aluminum deoxidation, reoxidation and inclusion precipitation during solidification. It is found that the supersaturation is the key for determining the dominant nucleation. During the inclusion precipitation with a high concentration of deoxidizing elements, e.g. Al, the homogeneous nucleation is dominant. In comparison, the heterogeneous nucleation and following diffusion is the most probable way to modify alumina into spinel and solid and liquid calcium aluminates. The present modelling framework will make it possible to calculate the evolution of amount, composition and size distribution inclusions during the whole process chain in steelmaking and casting, and therefore provide a valuable tool for process control in steel plants. Owing to the wide range of applicable cooling rates, the model is applicable not only for slabs but also for blooms, billets or thin slabs.
CLASS:PUBLIC
DTSTART:20230614T121000
DTEND:20230614T123000
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