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What is Heat treatment?

Heat treatment of carbon, alloy, stainless, nickel based alloys, and aluminum. <br>http://www.patriotforge.com/capabilities-services/heat-treat-capabilities/

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What is Heat treatment?

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  1. WHAT IS HEAT TREATMENT?

  2. WHAT IS HEAT TREATMENT? • Heat treatment is the heating and cooling of metals to change their physical and mechanical properties, without letting it change its shape. • The most common application is metallurgical but heat treatment can also be used in manufacture of glass, aluminum, steel and many more materials.

  3. HEAT TREATMENT PROCESSES • Hardening • Tempering • Annealing • Normalizing

  4. HARDENING • Hardening involves heating of steel, keeping it at an appropriate temperature until all pearlite is transformed into austenite, and then quenching it rapidly in water or oil. • The temperature at which austenitizing rapidly takes place depends upon the carbon content in the steel used.

  5. TEMPERING • Tempering involves heating steel that has been quenched and hardened for an adequate period of time so that the metal can be equilibrated. • The hardness and strength obtained depend upon the temperature at which tempering is carried out.

  6. HOW TEMPERATURE AFFECTS TEMPERING • Higher temperatures will result into high ductility, but low strength and hardness. • Low tempering temperatures will produce low ductility, but high strength and hardness.

  7. ANNEALING • Annealing involves treating steel up to a high temperature, and then cooling it very slowly to room temperature, so that the resulting microstructure will possess high ductility and toughness, but low hardness. • Annealing is performed by heating a component to the appropriate temperature, soaking it at that temperature, and then shutting off the furnace while the piece is in it.

  8. NORMALIZING • Normalizing involves heating steel, and then keeping it at that temperature for a period of time, and then cooling it in air. • The resulting microstructure is a mixture of ferrite and cementite which has a higher strength and hardness, but lower ductility.

  9. WHY HEAT TREATMENT IS NECESSARY? • Heat treatment process effect on material structure and grains. • Most carbon steels and carbon alloy steels can be heat treated for the purpose of improving mechanical properties such as tensile and yield strength. • This is accomplished due to the heat treatment fundamentally altering the microstructure of the steel

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