Engineering Materials
When medium carbon steel is heated to coarsening temperature

The average grain size is a minimum
The grain size first increases and then decreases very rapidly
There is no change in grain size
The grain size increases very rapidly

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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
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. 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

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Engineering Materials
Grey cast iron

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
Is also known as chilled cast iron 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
Is produced by annealing process. I is soft, tough and easily machined metal

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Engineering Materials
Inconel contains

80% nickel, 14% chromium and 6% iron
80% nickel and 20% chromium
68% nickel, 29% copper and 3% other constituents
65% nickel, 15% chromium and 20% iron

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