Page 133 - WCS - Electrical

WORKSHOP CALCULATION & SCIENCE - CITS

Brittleness (Fig 11)

Brittleness is that property of a metal which permits no permanent distortion before breaking. Cast iron is an
example of a brittle metal which will break rather than bend under shock or impact.

Toughness (Fig 12)
Toughness is the property of a metal to withstand shock or impact. Toughness is the property opposite to
brittleness. Wrought iron is an example of a tough metal.

Tenacity
The tenacity of a metal is its ability to resist the effect of tensile forces without rupturing. Mild steel, Wrought Iron
and copper are some examples of tenacious metals.
Elasticity
Elasticity of a metal is its power of returning to its original shape after the applied force is released. Properly heat-
treated spring is a good example for elasticity.
Introduction of iron and cast iron
Ferrous Metals
Metals which contain iron as a major content are called ferrous metals. Ferrous metals of different properties are
used for various purposes.
Introduction of Iron, Cast Iron, wrought Iron and steel
The ferrous metals and alloys used commonly are:
• Pig-iron

• Cast Iron
• Wrought Iron

120

CITS : WCS - Electrical - Exercise 11