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Induction Surface Hardening

Teacher Jerzy Barglik, Hans De Keulenaer


Induction hardening in general is a form of heat treatment in which a whole metallic body  or  its selected part is heated by induction, then kept for some short time in order to achieve requested temperature distribution and finally quenched. It is the energy saving technology of heat treatment especially  used for axi-symmetric and flat steel elements. It is in fact the most popular application of induction heating in the industry. During my presentation after a short introduction dealing with idea of surface induction hardening and its features  I will cover following topics:

  • Mathematical Modelling of Induction Hardening
  • Through and surface hardening
  • Specific mathematical models for induction surface hardening and software
  • Metallurgical aspects of Induction Surface Hardening process
  • Hardenability. Kinds of steel applied for induction hardening. Their material properties.
  • Iron-carbon equilibrium diagram and modified TTA and CTPc  diagrams
  • Properties and microstructures of induction surface hardening
  • Kinds of induction surface hardening: scan hardening, single-shot hardening, continuous hardening, dual frequency hardening etc.
  • Inductors and flux concentrators
  • Selection of field current frequency, power and time of heating and cooling
  • Quenching systems
  • Depth of hardening. Methods  of measurements.
  • Residual Stresses
  • Review of practical applications of induction surface hardening technology
  • Induction hardening of steel pipes by external and internal inductor
  • Continual induction hardening of conical mandrels
  • Surface induction hardening of angle bars
  • Induction hardening of gear wheels
  • Dual frequency method.

Duration (hours)