Abstract
During the direct chill (DC) casting process, quenching water emerging from an array of jets impinges directly on the hot surface in motion. To investigate the mechanism of heat transfer in DC Casting, the secondary cooling process was resembled in laboratory conditions. Hot metal plates with a dimension of 200 mm length, 90 mm width, and 2–10 mm thickness in relative movement are quenched with 11 water jets from a typical mold similar to the direct chill casting process. The surface temperatures on the black-coated, rear side were measured with an Infrared camera with a temporal frequency of 200 images per second and with a local resolution of 0.5 mm. The heat flux and temperatures on the quenched surface were obtained from the solution of the iterative two-dimensional inverse method for Eulerian-steady state conditions. The appropriate associated governing partial differential equation was solved with a numerical finite difference method. Various cooling regions like pre-cooling, transition, and nucleate boiling were quantified for thickness, the initial temperature of the plate, kinds of metal, and the influence of the parameters on the boiling curve was quantified.