A model for inclusion precipitation kinetics during solidification of steel
Shu, Qifeng; Visuri, Ville-Valtteri; Alatarvas, Tuomas; Fabritius, Timo
Shu, Qifeng
Visuri, Ville-Valtteri
Alatarvas, Tuomas
Fabritius, Timo
Associazione Italiana di Metallurgia
Shu, Q., Visuri, V-V., Alatarvas, T. & Fabritius, T. (2021). A model for inclusion precipitation kinetics during solidification of steel. Paper presented at the 10th European Conference on Continuous Casting held in Bari, Italy from 20 to 22 October 2021. Associazione Italiana di Metallurgia.
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© The Authors & Associazione Italiana di Metallurgia
https://rightsstatements.org/vocab/InC/1.0/
© The Authors & Associazione Italiana di Metallurgia
https://rightsstatements.org/vocab/InC/1.0/
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:oulu-202506124361
https://urn.fi/URN:NBN:fi:oulu-202506124361
Tiivistelmä
Abstract
Apart from the endogenous inclusions formation during secondary steelmaking, additional inclusions could precipitate during solidification of steel due to the thermodynamic supersaturation resulting from elements segregation in the interdendritic liquid. A comprehensive model coupling microsegregation with precipitation thermodynamics and kinetics for solidification of inclusion was proposed. The size distribution of precipitated inclusions during solidification could be calculated with the present model. The microsegregation of various elements during solidification was calculated using the stepwise Ohnaka microsegregation equation. The precipitation kinetics of inclusion was modelled by using Kampmann and Wagner numerical method(KWN). The model has been validated on solidification of MnS, AlN inclusions with data in literature. Good agreements between predicted mean size and size distributions of inclusion and experimental data have been achieved. The influences of steel composition, cooling rate and other factors on size distribution of precipitated inclusions were discussed based on the calculations of the present model.
Apart from the endogenous inclusions formation during secondary steelmaking, additional inclusions could precipitate during solidification of steel due to the thermodynamic supersaturation resulting from elements segregation in the interdendritic liquid. A comprehensive model coupling microsegregation with precipitation thermodynamics and kinetics for solidification of inclusion was proposed. The size distribution of precipitated inclusions during solidification could be calculated with the present model. The microsegregation of various elements during solidification was calculated using the stepwise Ohnaka microsegregation equation. The precipitation kinetics of inclusion was modelled by using Kampmann and Wagner numerical method(KWN). The model has been validated on solidification of MnS, AlN inclusions with data in literature. Good agreements between predicted mean size and size distributions of inclusion and experimental data have been achieved. The influences of steel composition, cooling rate and other factors on size distribution of precipitated inclusions were discussed based on the calculations of the present model.
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