The eutectoid phase transition in the iron carbon system takes place at 727 C. The three components in equilibrium at this temperature are Austenite, g, with the composition Fe - 0.77 wt % C, Ferrite, ...

The vertical alloy composition line on the partial phase diagram is for a hypoeutectoid alloy with the composition Fe - 0.38 wt % C. Before transforming to pearlite, this material phases through the ...