When cooled slowly below 670 degrees, martensite yields a

heterogeneous mixture of pearlite and ferrite (or cementite, if
the original mixture contained between 0
When cooled slowly below 670 degrees, martensite yields a
heterogeneous mixture of pearlite and ferrite (or cementite, if
the original mixture contained between 0.8 per cent. and two
per cent. of carbon). Soft steels and wrought iron are thus
obtained. When cooled rapidly, however, as in the tempering of
steel, martensite remains a homogeneous solid solution, or hard
steel.


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