11.
The machinability of steel is increased by

12.
The hardness is the property of a material due to which it

13.
White cast iron has

14.
When a steel containing __________ 0.8% carbon is cooled slowly below the lower critical point, it consists of ferrite and pearlite.

15.
The ratio of the volume occupied by the atoms to the total volume of the unit cell is called

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