Know more about the heat treatment

Hi,
Most of them among ourselves has got many doubts about the heat treatment. There rises many questions like:
1. What is it?
2. Why it is used?
3. When it is used?
4. What are the benefits?
I did my diploma in Automobile Engineering and there has got innumerable purposes which are achieved by heat treatment in Toronto yet the following are important:-
1. To relieve internal stresses, which are set up in the metal due to cold or hot working.
2. To soften the metal.
3. To improve the hardness of the metal surface.
4. To improve machinability.
5. To refine the grain structure
6. To improve mechanical properties like tensile strength, ductility and shock resistance, etc.
7. To improve electrical and magnetic properties.
8. To increase the resistance to wear, tear, heat and corrosion, etc.

I hope this will be informative for someone in the future.
Thank You.
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