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홍준표,강신언,허완욱,이성윤 대한금속재료학회(대한금속학회) 2001 대한금속·재료학회지 Vol.39 No.8
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.
연속주조와 열간압연의 직결화에 관한 Slab 의 온도거동
윤우석,강신언 대한금속재료학회(대한금속학회) 1995 대한금속·재료학회지 Vol.33 No.12
In order to realize hot direct rolling(HDR) process, it is prerequisite to produce high temperature slabs by the continuous casting process. For this purpose, two-dimensional mathematical model has been used to estimate the change in slab temperature from the meniscus to the edge heater. The secondary cooling patterns have been modified to obtain slabs with high temperature via slab surface temperature measurements and thermal analysis of the slabs. The effect of the thermal insulator on slab temperature has been studied to find out the optimum condition for obtaining slabs with higher temperature. As means to investigate the temperature profile of slab in the edge heater and to validate mathematical model, temperature of slab with embedded thermocouples was measured in the edge heater. Based on the above temperature controlling methods, the HDR has been operated successfully.