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Proceedings of CHT-17 ICHMT International Symposium on Advances in Computational Heat Transfer
May 28 - June 1, 2017, Napoli, Italy

DOI: 10.1615/ICHMT.2017.CHT-7


ISBN Print: 9781-56700-4618

ISSN: 2578-5486

NUMERICAL ANALYSIS OF STEEL SOLIDIFICATION AND PARTICLE ENTRAPMENT IN A CONTINUOUS BILLET CASTER

pages 1047-1058
DOI: 10.1615/ICHMT.2017.CHT-7.1110
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In this work, continuous casting process of a billet caster has been simulated using a simple, but comprehensive mathematical model. The solidification process is modelled through finite-difference calculations of heat conduction within the solidifying steel shell which give thermal gradients and columnar front velocity along the billet mid-plane. In order to account for bulk convection due to the submerged-entry nozzle, an effective thermal conductivity within the mush is defined under the solid-liquid coexisting zone theory. The model predicts solidified shell thickness, local solidification time, metallurgical length and two important microstructural parameters – primary and secondary dendritic arm spacings (PDAS and SDAS) – which are used to characterize inclusion redistribution during solidification. Inclusion-front interaction is modelled using a dynamic formulation that calculates the critical velocity for pushing or engulfment as a function of particle size and factors in the differences in thermal properties of particle and melt. Pushing of inclusions larger than the estimated PDAS and entrapment of inclusions smaller than SDAS is also considered.

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