발간논문

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Vol.39, No.8, 939 ~ 949, 2001
Title
Mathematical Modeling : Development of a Numerical Model for the Prediction of Centerline Segregation with Consideration of Deformation in Continuously Cast Slab
이성윤Sung Yoon Lee,강신언Shin Eon Kang,허완욱Wan Wook Huh,홍준표Chun Pyo Hong
Abstract
A fully coupled numerical model was developed to predict the formation of macrosegregation with consideration of deformation in continuous casting of steel slabs. A continuum formulation was adopted to investigate the macroscopic transport of momentum, heat and species in the continuous casting process. Darcian damping and thermosolutal connections were considered in the simulation to evaluate solute redistribution in the mushy zone. The BFC(Boundary-Fitted Coordinate) method was adopted to simulate the deformed grid and the solid phase velocity in the mushy zone due to the bulging that occurred between rolls. The velocity of the solid phase due to the deformation of a slab was calculated to apply the continuum model. The effects of bulging and casting speed were investigated on the solidification characteristics of cast steel slabs, such as the formation of solidification shell and the temperature distribution. It was found that the bulging caused by ferro-static pressure had a great effect on the formation of both centerline and inverse segregation. In addition, segregation simulations were performed for various chemical components, such as C Mn, P and S. It was also found that the present model can be successfully applied to predict the formation of centerline segregation in continuous casting of steel slabs.
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