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Materials shaped changed at temperatures well below the recrystallization temperatures, List the two primary property changes...

Materials shaped changed at temperatures well below the recrystallization temperatures, List the two primary property changes and describe how and why they change.

Engineering   Civil-Engineering   
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Answer #1

Two primary property changes are :

Hardness and Strength

When material is formed in cold state, there is no recrystallization of grains and thus recovery from grain distortion or fragmentation does not take place. As grain deformation proceeds, greater resistance to this action results in increased hardness and strength.

The material is said to be strain hardened. There are several theories to explain this occurrence. In general, these refer to resistance build up in the grains by atomic dislocation, fragmentation, or lattice distortion, or a combination of the three phenomena.

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