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Question
Strain hardening
A.
increases ductility and plasticity of metal
B.
may be defined as increased hardness accompanying plastic deformation of metal
C.
decreases tensile strength of metal
D.
decreases yield strength of metal
Answer ( Option B)

may be defined as increased hardness accompanying plastic deformation of metal

Solution

Strain hardening: 
• When yielding has ended, a further load can be applied to the specimen, resulting in a curve that rises continuously but becomes flattered until it reaches maximum stress referred to as ultimate stress. The rise in the curve is known as strain hardening 
• Strain hardening is the strengthening of a metal or polymer by plastic deformation. The strengthening occurs because of dislocation movements and dislocation generation within the crystal structure of the material. 
• Strain hardening increases the strength of the metal, including its hardness and tensile strength. It also decreases the ductility of the metal, meaning that it becomes less able to deform without cracking or breaking.However, it does not decrease the yield strength of the metal.

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