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Definition:Annealing is the process of heating a metal to a certain temperature, holding it at that temperature for a defined period of time and then slowly cooling the metal. Annealing is done to change the crystal grain structure of a metal in order to reduce hardness and brittleness. It also aids in softening a metal so as to allow it to be cut or shaped more easily.
Aluminum, steel,copper,silver andbrass can all be annealed by heating followed by cooling at room temperature. Copper, silver and brass can also be quenched in water to cool quickly, whereas steel and other ferrous metals must slow cool in order to anneal.
Edited by: Terence Bell