Heat Treatment Of Metals Powerpoint

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Heat Treatment Of Metals Powerpoint

  1. 1. Annealing <ul><li>Annealing is done to improve ductility (the ability to be drawn and extruded) and reduce brittleness. </li></ul><ul><li>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. </li></ul><ul><li>This can be done in either hot sand, ashes of a fire or by leaving the metal in an oven or furnace until cooled. </li></ul>
  2. 2. Tempering <ul><li>Tempering is done to remove some of the brittleness and hardness of steel after hardening. </li></ul><ul><li>Suitable temperatures for tempering vary considerably </li></ul><ul><li>Tempering by colour still provides an accurate and reliable method of dealing with plain carbon steels </li></ul><ul><li>Hacksaws blades 220.C Pen knifes 250.C Light brown </li></ul>
  3. 3. Normalising <ul><li>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. </li></ul><ul><li>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. </li></ul><ul><li>This more rapid cooling results in a finer grain structure which in turn leads to improved physical properties and improved finishes when machining. </li></ul>
  4. 4. Hardening <ul><li>Hardening of steels is done to increase the strength and wear properties. </li></ul><ul><li>Carbon steel is heated 30 & 50 degrees C above the upper critical point and then quenched quickly </li></ul><ul><li>The quicker the steel is cooled the harder it will be. </li></ul>
  5. 5. Assignment- Heat Treatment and work hardening of metals <ul><li>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 </li></ul><ul><li>Hypothesis: I predict that after hardening…….. </li></ul><ul><li>Method: Hardening……. </li></ul><ul><li>Results/ Testing….After filing and hammering </li></ul><ul><li>Conclusion: After the results </li></ul>

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