Annealing is a heat treatment carried out to

Explanation:

Annealing:

• It is a heat treatment process which alters the microstructure of a material to change its mechanical or electrical properties.
• Typically, in steels, annealing is used to reduce hardness, increase ductility and help eliminate internal stresses.
• In annealing, Furnace cooling is required.

Normalising:

• Normalizing involves heating steel and keeping it at that temperature for a period of time followed by cooling it in air.
• The resulting microstructure is a mixture of ferrite and cementite which has higher strength and hardness, but lower ductility.

Tempering:

• It involves heating steel that has been quenched and hardened for an adequate period of time so that the metal can be equilibrated.
• The hardness and strength obtained depend upon the temperature at which tempering is carried out.
• Higher temperatures will result in high ductility, low strength and hardness while Low tempering temperatures will produce low ductility, high strength and hardness.