- 鉄と鋼 (ISSN:00211575)
- vol.63, no.13, pp.2162-2171, 1977
Local temperature and voltage in the molten flux and metal pool beneath the electrode of ESR porcesses were measured directly by a bare hot junction of W-WRe thermocouple.<BR>The temperature in the flux during remelting was almost uniform at 1750±30°C. No temperature gradient was found at the metal pool-flux interface. The temperature in the metal pool decreased smoothly downward in the pool with a platea at 1500°C which was the liquidus temperature of the steel used.<BR>The iso-voltage line was densely distributed at the electrode-flux interface and broadened toward the metal pool-flux interface. Most of the “Joule heat” in the flux was generated very close to the electrode. However, Faradaic heat generation at the electrode-flux interface was hardly found.<BR>It is suggested from the experimental results that refining processes, not only slag-metal reaction but also inclusion removal take place mainly at the metal pool-flux interface. Because the temperature in the flux was uniform even with the localized heat generation, a violent convection should exist in the flux.<BR>One of the driving forces for the convertion, the pinch effect of the current, was calculated. The selection of the proper voltage and current in order to have a good shape of the metal pool was suggested on an I-V diagram.