Engineering Materials
Chilled cast iron has

No graphite
Graphite as its basic constituent of composition
A low percentage of graphite
A very high percentage of graphite

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Engineering Materials
Malleable cast iron

Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable
Is produced by annealing process. It is soft, tough, and easily machined metal
Is produced by small additions of magnesium (or cerium) in the ladle. Graphite is in the 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

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Engineering Materials
Which of the following statement is true about brittle fracture?

Brittle fracture is always preceded by noise
High temperature and low strain rates favour brittle fracture
Many metals with hexagonal close packed (H.C.P) crystal structure commonly show brittle fracture
Cup and cone formation is characteristic for brittle materials

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Engineering Materials
Combined carbon in iron makes the metal

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

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