Engineering Materials
Addition of silicon to aluminium results in

Improvement of corrosion resistance
Improving machinability
Improvement of casting characteristics
One of the best known age and precipitation hardening systems

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Engineering Materials
Grey cast iron

Is also known as chilled cast iron is obtained by cooling rapidly. It is almost unmachinable
Is produced by small additions o magnesium (or cerium) in the ladle Graphite is in nodular or spheroidal form and is well dispersed throughout the material
Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron
Is produced by annealing process. I is soft, tough and easily machined metal

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Engineering Materials
Combined carbon in iron makes the metal

Hard and gives a coarse grained crystalline structure
Soft and gives coarse grained crystalline structure
Soft and gives a fine grained crystalline structure
Hard and gives a fine grained crystalline structure

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