Engineering Materials
Stress relaxation is the phenomenon

In which stress remains constant on increasing load
In which parts are not loaded
Stress reduces on increasing load
In which deformation tends to loosen the joint and produces a stress reduced

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Engineering Materials
Combined carbon in iron makes the metal

Soft and gives a fine grained crystalline structure
Hard and gives a coarse grained crystalline structure
Hard and gives a fine grained crystalline structure
Soft and gives coarse grained crystalline structure

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