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Heat Treatment Of Metals Powerpoint
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Heat Treatment Of Metals Powerpoint

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  • 1. Annealing
    • Annealing is done to improve ductility (the ability to be drawn and extruded) and reduce brittleness.
    • Annealing consists of softening the metal by heating it between 30 & 50 degrees C above it upper critical point and allowing it to cool slowly.
    • This can be done in either hot sand, ashes of a fire or by leaving the metal in an oven or furnace until cooled.
  • 2. Tempering
    • Tempering is done to remove some of the brittleness and hardness of steel after hardening.
    • Suitable temperatures for tempering vary considerably
    • Tempering by colour still provides an accurate and reliable method of dealing with plain carbon steels
    • Hacksaws blades 220.C Pen knifes 250.C Light brown
  • 3. Normalising
    • The main purpose of normalising is to obtain a structure that is uniform throughout the work piece and is free from any ‘locked up’ stresses.
    • Similar to annealing, but the cooling rate is accelerated by taking the work piece from the furnace and allowing it to cool in free air.
    • This more rapid cooling results in a finer grain structure which in turn leads to improved physical properties and improved finishes when machining.
  • 4. Hardening
    • Hardening of steels is done to increase the strength and wear properties.
    • Carbon steel is heated 30 & 50 degrees C above the upper critical point and then quenched quickly
    • The quicker the steel is cooled the harder it will be.
  • 5. Assignment- Heat Treatment and work hardening of metals
    • Aim: The aim of this experiment is to test the effects of hardening then tempering a piece of medium carbon steel to a level required for a punch
    • Hypothesis: I predict that after hardening……..
    • Method: Hardening…….
    • Results/ Testing….After filing and hammering
    • Conclusion: After the results

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