What is annealing?
The heat treatment process that alters the physical and sometimes chemical properties of a material to increase its ductility and reduce its hardness and making it more reliable and workable is called annealing.
What is normalizing?
Normalizing is also heat treatment process that mainly considered for thermal and microstructure properties used to relieve internal stresses, refine the grain size and improve mechanical properties.
Let us have a deep insight into the comparison between annealing vs normalizing.
Let us have a deep insight into the comparison between annealing vs normalizing.
Basic
Difference :
Annealing: It
is the process of heating metal in a furnace above its.
recrystallization temperature and allows it to cool inside the
furnace.
Normalizing: The process is similar to that of annealing, but after soaking stage the material
is taken out from the furnace and allowed to cool in the atmosphere.
Definition
:
Annealing:
It is a
method of heat treatment used to make metals ductile and less hard.
Normalizing: It is a type of annealing process
which is only specific to ferrous alloys.
Cooling
process :
Annealing: The metals can be cooled down after heating either by
cooling them in the air or quenching them in water.
Normalizing: It is important that the cooling process takes place
slowly in this process so that it is always cooled in air and not quenched in
water.
Grain Size :
Annealing: It is not crucial to achieving a uniform grain
size during the process.
Normalizing: Obtaining a uniform grain size is important for
the process.
The hardness of the final product :
Annealing: The metals are made to be less hard and ductile
after annealing.
Normalizing: The alloys remain harder after normalizing when compared to a full annealing process.
Purpose :
Annealing: To increase some of the properties like ductility,
softness, toughness, fine grain size and machineability so this reduces the
hardness.
Normalizing: To increase machinability, hardness to attain
fine grain size than attained during annealing less softness and ductility.
Process :
Annealing: Heating the steel to a defined temperature and
cooling it in a conditioned atmosphere like in furnace.
Normalizing: Heating the steel to the above austenitic range
and cooling in air.
Internal Stresses :
Annealing: Internal stresses are least.
Normalizing: Internal stresses are slightly more.
Pearlite design :
Annealing: Pearlite is coarse.
Normalizing: Pearlite is fine.
Cost :
Annealing: More expensive as it uses ovens.
Normalizing: Less expensive than annealing.