2001 Volume 41 Issue 9 Pages 981-985
The initial solidification during electromagnetic continuous casting of metal has been investigated experimentally and numerically. The temperature profile in the metal was measured and the starting point of the initial solidification was detected. It was found that the magnetic field influenced the temperature profile greatly, and lowered the starting position of the initial solidification profoundly. Further, the induction heat in the metal was calculated according to the measured magnetic flux in the mold. The heat induced in the wall was converted from the temperature detected in the mold wall. In order to understand the influence of the magnetic field on the behavior of the interfacial heat exchange between the metal and the mold wall, a special experiment was carried out to measure the heat exchange coefficient on the interface.
Based on above measurement, a numerical model was built to describe the heat transfer and solidification of the metal. The influence of the magnetic field on the solidification was figured out. The role of the three main effects of the magnetic field, that is, inducing heat in the metal, inducing heat in the mold wall, and decreasing the heat transfer rate on the interface between the metal and mold wall, was analyzed. It was shown that, the induced heat in the mold wall and the effect of decreasing the heat transfer on the interface between the mold and the metal may played a more important role in influencing the solidification.
