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Metals have crystaline structures and they have specific characteristics because of different crystal microstructures inside them. Crystalline materials have grain boundries inside their microstructures. In engineering metal, formation and amount of these grain boundries are utilized to obtain specific properties from them. For example if you incresa the grain boundry density inside a material, strength of related material will increase which is called as strain hardening. But in elevated temperatures, this mechanism changes. In this article, we will explain the characteristics of grain boundry formation and grain boundries in metals.
If we heat the metal to elevated temperatures and deform it in that temperature, the strain hardening phenomenon does not occur. New grains are occur that free of strains at elevated temperature deformations. So this phenomenon is called as recrystallization. Metals have recrystallization temperature that is generally half of the melting temperature of them.
Recrystallization temperature phenomenon are generally used in industry. In elevated temperatures, metals are deformed much more easily. And new crystals inside the deformed metal occur. This process is also called as hot working.
In general applications of hot working processes, recrystallization occurs in 1 hour.
So deformation of metals can be done in elevated temperatures to obtain strain free crystals inside them and the lower the force that needed to be applied to material to bend or deform them in hat working processes.
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