Friday, 3 June 2016

Difference between Hot Working and Cold Working

Today I am going to tell you main difference between hot working and cold working. They both are the metal forming processes. When plastic deformation of metal is carried out at temperature above the recrystallization temperature the process, the process is known as hot working. If this deformation is done below the recrystallization temperature the process is known as cold working. There are many other differences between these processes which are described as below.


Difference between Hot Working and Cold Working:



S.No.


Cold working

Hot working

1

It is done at a temperature below the recrystallization temperature.

Hot working is done at a temperature above recrystallization temperature.


2.

It is done below recrystallization temperature so it is accomplished by strain hardening.


Hardening due to plastic deformation is completely eliminated.

3.

Cold working decreases mechanical properties of metal like elongation, reduction of area and impact values.


It increases mechanical properties.

4.


Crystallization does not take place.

Crystallization takes place.


5.


Material is not uniform after this working.


Material is uniform thought.

6.


There is more risk of cracks.

There is less risk of cracks.

7.

Cold working increases ultimate tensile strength, yield point hardness and fatigue strength but decreases resistance to corrosion.


In hot working, ultimate tensile strength, yield point, corrosion resistance are unaffected.

8.

Internal and residual stresses are produced.

Internal and residual stresses are not produced.




These are the main difference between hot working and cold working. If you have any query regarding this article, ask by commenting. 

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