The
process used for relieving the internal stress previously set up in the metal
for increasing the machinability of the steel is
Full
annealing
Normalizing
Process
annealing
Spheroidising
Process
annealing
The
process used for relieving the internal stress previously set up in the metal
for increasing the machinability of the steel is process annealing.
Hence, the correct option is (C).
&Key Points:-
|
Types of annealing |
Objective/effect |
|
Full annealing
|
Reduces hardness, increases ductility,
refines grain structure, relieves internal stress induced due to cold
working, welding etc. |
|
Process annealing |
Removes residual stress, increases
machinability of steel, removes the effect of cold working. |
|
Spheroidize annealing |
It improves machinability, reduces hardness
and helps for giving uniform structure. |
|
Normalizing |
The objective of the treatment is to
counter the effect of prior processes such as casting, forging or rolling
into one which enhances toughness, or in certain product forms meets final
mechanical property requirements. |
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