Assistant Design Engineer Question:

Heat treatment can be defined as a combination of processes or operations in which the heating and cooling of a metal or alloy is done in order to obtain desirable characteristics without changing the compositions. Some of the motives or purpose of heat treatment are as follows:
☛ > In order to improve the hardness of metals.
☛ > For the softening of the metal.
☛ > In order to improve the machinability of the metal.
☛ > To change the grain size.
☛ > To provide better resistance to heat, corrosion, wear etc.

Heat treatment is generally performed in the following ways:
☛ > Normalizing
☛ > Annealing
☛ > Spheroidising
☛ > Hardening
☛ > Tempering
☛ > Surface or case hardening