Properties of Austenite, Cementite, Ledeburite, Ferrite, and Pearlite in Iron-Carbide, Slides of Mechanical Engineering

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Iron-Iron Carbide Equilibrium Diagram

^ Austenite

:^ It is solid solution of carbon

dissolved in

γ^ (f.c.c.) iron. Normally it is not

stable at room temperature. Maximumsolubility of carbon is 2 % at 2065 degree F. Itsaverage properties are : tensile strength, 150000psi: elongation, 10 % in 2 in: hardness,Rockwell C 40 and toughness, high.

^ Ferrite:

It is a solid solution of a small amount of carbon in

α^ (b.c.c.) iron. The maximum

solubility of C is 0.025 % at 1333 degree F. Atroom temperature the maximum solubility of Cis 0.008 %. Ferrite is the softest structure ofsteel. Its average properties are: tensilestrength, 40000 psi: elongation, 40 % in 2 in:hardness, less than Rockwell C 0.

^ Pearlite:

It is a eutectoid mixture formed at

1333 degree F on very slow cooling. It contains0.8 % C and is a mixture of ferrite andcementite. Its average properties are: tensilestrength, 120000 psi: elongation, 20 % in 2 in:hardness, Rockwell C 20.