Engineering Materials
When steel containing less than 0.8% carbon is cooled slowly from temperatures above or within the critical range, it consists of

Mainly pearlite
Pearlite and cementite
Mainly ferrite
Ferrite and pearlite

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Engineering Materials
The unit cells

Have the same orientation and their similar faces are parallel
May be defined as the smallest parallelepiped which could be transposed in three coordinate directions to build up the space lattice
Contain the smallest number of atoms which when taken together have all the properties of the crystals of the particular metal
All of these

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Engineering Materials
Points of arrest for iron correspond to

Stages at which properties do not change with increase in temperature
Stages at which further heating does not increase temperature for some time
Stages at which allotropic forms change
There is nothing like points of arrest

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