連鋳鋳型内におけるメニスカス近傍の初期凝固解析

抄録

For the improvement of surface quality of continuously cast steel, an analysis model taking into consideration of steel casting has been developed on the following procedure in order to explain initial solidification phenomenon in the vicinity of meniscus.
(1) A calculation method of temperature distribution has been worked out, assuming that a small quantity of new molten steel flows into mold intermittently and solidified shell and molten steel are casted vertically to the horizontal direction.
(2) Direct difference method using inner nodal point is applied to the numerical calculation of heat transfer equation so that the movement of molten steel due to casting can be easily dealt with, and four kinds of equations are made according to the boundary condition as the fundamental equations in divided mesh.
By using this model, it becomes possible to estimate the temperature distribution in steady-state under casting. In this study, the solidified shell, slag rim shape and the temperature distribution in mold area in the case of using the ordinary copper mold are estimated. Furthermore the adiabatic effect in the case of using mild cooling mold containing refractory is evaluated quantitatively.