Heat Treatment of metals is the process in which a metal is heated beyond its critical temperature and cooled in a controlled environment to make desirable changes in its internal micro structural properties and chemical properties to obtain a desired structure.

1.1 Different types of Heat Treatment  are:

• • Annealing

1. 1. 1. 1. Full annealing
         2. Process annealing
         3. Stress relief annealing
         4. Recrystallisation annealing
         5. Spheroidise annealing

• • Normalising
  • Hardening
  • Tempering
  • Martempering
  • Austempering
  • Case Hardening

1. 1. 1. 1. Carburising
         2. Nitriding
         3. Cyaniding
         4. Carbonnitriding
         5. Flame Hardening
         6. Induction Hardening

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