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자료유형
학술저널
저자정보
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.28 No.10
발행연도
2022.10
수록면
2,434 - 2,447 (14page)
DOI
10.1007/s12540-021-01135-y

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A coupled thermofluidic-mechanical model has been developed to analyse the thermomechanical state of the solidifying shellin a continuously cast steel billet. The computational fluid dynamics (CFD) based solver simulates the three-dimensionalflow field and solidification of molten steel as it flows inside the mould. Finite element method based thermomechanicalmodel is coupled with the CFD model to determine the resultant temperature distribution and stress–strain evolution in thesolidifying strand. The heat transfer at the mould-billet interface is taken into account by the calculation of heat flux using anovel inverse heat transfer algorithm. Temperature measurements made in the industrial billet mould have been used for thepurpose. Plant experiments and observations are correlated with the numerical results to provide quantitative understandingof the complex thermomechanical process during billet casting. Various parametric studies are also undertaken to examinethe effects of casting speed, superheat and heat flux changes on resultant strain and temperature distribution. It is observedthat the accumulated plastic strains exceed the critical strain at the off-corner region thereby indicating the possibility ofcrack formation in this region. Reduction of heat flux can lead to lowering of the strain rate at the corners and offer a viablesolution for reducing corner cracks.

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