Engineering Materials
Which of the following represents the allotropic forms of iron?

Alpha iron, gamma from and delta iron
Alpha iron and beta iron
Body centered cubic iron and face centered cubic iron
Alpha iron, beta iron and gamma iron

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Engineering Materials
White cast iron

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