Induction hardening is often used for large gears that are too large for existing carburizing furnaces. Large gears are usually heat treated by the tooth-to-tooth scanning induction hardening process, and that is the subject of this report. A major advantage of induction hardening is that the distortion and growth is much less than that associated with carburizing because only the case is heated while the core remains below the transformation temperature. However, induction-hardened gears have lower surface hardness and less load capacity than carburized gears, and this limitation must be recognized in any comparison of carburized and induction-hardened gears.
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