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Heat treatment is the process of heating and cooling metals to change their microstructure and to bring out the physical and mechanical characteristics that make metals more desirable.

carbon dioxide pressure temperature phase diagram
carbon dioxide pressure temperature phase diagram


The temperature metals are heated to and the rate of cooling after heat treatment can significantly change metal's properties. Critical temperature is the temperature above which these changes to microstructure occur.

The most common reasons metals undergo heat treatmentare to improve their strength, hardness,toughness dutility and corrosion resistance.

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