How does the temperature of the metal workpiece heated by the induction heating furnace change?

Due to the skin effect of the metal workpiece heated by the induction heating furnace, there is a certain temperature difference between the surface and the center of the material. For magnetic materials, at the beginning, due to the large magnetic permeability, the ability to absorb power is strong, and the surface temperature rises quickly after reaching the Curie point. The current suddenly drops, and the rate of temperature rise becomes slower. At the same time, the surface heat is continuously transferred to the center, reducing the temperature difference between the surface and the center.