Explain why the interlamellar spacing of the pearlite struct

Explain why the interlamellar spacing of the pearlite structure formed from austenite depends on the transformation temperature.

Solution

Pearlite :
A metastable microstructure formed from austenite. The structure is an aggregate consisting of alternate lamellae of ferrite and cementite formed on slow cooling during the eutectoid reation. In one alloy of given composition, pearlite may be formed isotermally at temperatures below the eutectoid temperature by quenching austenite to a desired temperature and holding for a periof of time necessary for transformation to occur.

The interlamellar spacing is directly proportional to the transformation temperature , that is the higher the temperature , the grater the spacing.