Induction Surface Hardening
Induction surface hardening heats the surface of a workpiece by electromagnetic induction and quenches it rapidly to create a wear-resistant martensitic case. This improves the wear resistance of components.
Physicochemical working principle
Induction surface hardening uses electromagnetic fields to heat the surface of a workpiece. The rapid quenching causes a martensitic transformation in the surface zone of the material.
Metallurgical relevance & risks in welding
This technique improves the hardness and wear resistance of components, especially at the edges. Inadequate quenching, however, can lead to uneven hardness distribution, which can cause cracks or fractures.
Workshop practice & action instructions
Use an induction heater with the appropriate frequency and power for the material. Ensure that the surface is clean and free of scale. Quenching should occur within 10-30 seconds to create a homogeneous martensitic case.