The hypoeutectoid steel is the most ductile and the ductility has decreased by a factor of three for the eutectoid alloy. In hyper-eutectoid alloys the additional, brittle cementite on the pearlite ...

While it cools through this zone Fe 3 C is deposited on the austenite grain boundaries and the austenite composition moves to the eutectoid value. When the alloy reaches the eutectoid temperature the ...