LAUSR

The electroslag remelting hollow ingot process is a new technology, which is considered a promising method to manufacture the superior hollow ingot. Herein, a coupling multiphysical fields mathematical model is developed to investigate the magneto‐hydrodynamic two‐phase flow and heat transfer phenomena. A laboratory scale experiment is conducted to validate the model. The results indicate that the molten slag flows around the electrodes at the edge of slag bath. Under the electrode tip, the flow of molten slag is dominated by the dropping of metal droplets, with a maximum velocity of 0.12 m−1 s−1. The temperature is not uniform in the circumference direction due to the nonuniform arrangement of the electrodes. The behavior of metal droplets is similar to that in a traditional electroslag remelting process, with a final velocity of 0.44 m−1 s−1 and a final temperature of 1858 K. In addition, the heat flow at the ingot/external mold interface is 3–5 times larger than that at the ingot/inner mold interface. The heat flow at the slag/metal pool interface takes 42.6% of total power input, and the heat of metal droplets takes 28.6% of that, both of which are the main heat resources for metal pool.