Question

Match the following.

Heat treatment

Effect

P:

Tempering

1.

Strengthening

Q:

Quenching

2.

Toughening

R:

Annealing

3.

Hardening

S:

Normalizing

4.

Softening

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PROCESS	FUNCTION
Normalizing	It produces a uniform grain structure, so that strength could be improved. It removes cold and hot working stresses.
Annealing	It softens the material and brings about required changes in properties such as Machinability, Mechanical or Electrical properties.
Quenching	It increases the strength of the metal and increases wear resistance and hardenability but makes the metal brittle and of low ductility.
Tempering	It restores ductility and reduces hardness. Increased toughness is obtained at the expense of high strength.
Case hardening (carburizing)	It is a process of hardening the outer portion of the metal while the core remains soft and tough.

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