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고창호,현종각,백영현 고려대학교 공학기술연구소 1986 고려대학교 생산기술연구소 생기연논문집 Vol.22 No.1
A mathematical model describing heat transfer in the continuous casting of slab is proposed. The model consists of a unidimensional transient conduction equation arid boundary condition equations which specify heat flux at the metal-mold interface. The proposed model is characterized by followings: 1) the length of the mush (liquid-solid) region was estimated by experimental data and 2) the internal heat generation term was introduced to the main heat balance equation. By using FDM, cooling of slab was simulated at various casting conditions, and surface temperature as well as the locations of liquidus and solidus were determined as a function of casting distance. The results thus obtained revealed that the model fits better for the measured temperature profile.
백영현,현종각 고려대학교 공학기술연구소 1987 고려대학교 생산기술연구소 생기연논문집 Vol.23 No.1
A model of dendritic growth velocity was formulated by quantitizing the heat transfer in liquid and solid metal phases. The model was developed on the basis of an unidimensional transient conduction and liquid-solid interfacial condition at the dendrite front. The model equation wan decomposed by manna of FDM (Finite Differential Method) and the dendritic growth velocity was calculated by IBM-4341. The results thus obtained revealed that the growth velocity were fitted well with the experimental data which had been obtained for pure tin by G.T. Orrok. Effects of supercooling degree and the thermal conductivity on the velocity were also discussed thoroughly.
스라브의 연속주조시 스프레이 냉각특성과 주편의 온도 분포에 대한 모델의 연구
백영현,이광학,현종각 대한금속재료학회(대한금속학회) 1985 대한금속·재료학회지 Vol.23 No.3
The majority of cracks generated in the continuously cast strands are caused by tensile strains imposed either thermally or mechanically at the solidification front. It is well accepted that the thermal crack is generated as the reheat exceeds about 100℃ on the strand surface. To characterize the surface temperature profile, the cooling part between two supporting rolls of the spray cooling zone was subdivided into four sub-zones and the characteristic heat transfor coefficient in each sub-zone was applied accordingly. By means of computer simulation, effects of parameters, such as spray distance, casting speed, and pouring temperature on the reheating as well as the solidification rate were investigated separately at the spray cooling zone. Results thus obtained were discussed with respect to the cracking susceptibility of the cast strand.