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Saturday, 5 March 2016

Distinction between Annealing and Normalising

ANNEALING

NORMALISING
Main purpose of annealing is to 
relieve internal stresses
Main purpose of normalising is to 
improve mechanical properties.

Less hardness, more T.S & Toughness
Slightly more hardness, less T.S & Toughness.
Pearlite is coarse
Pearlite is fine and usually appears 
unresolved with optical microscope.
Grain size distribution is more.
Grain size distribution is less.
Internal stresses are least.
Internal stresses are slightly more.
Furnace cooling is employed.
Air cooling is employed.
Cooling rate is slow.
Cooling rate is high.
Costly and inconvenient.
Economical and more convenient.

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