For the hypereutectoid composition shown by the vertical green bar the material enters the two phase austenite + cementite zone prior to cooling through the eutectoid temperature. While it cools ...

Low carbon steel alloys have a composition close to the Eutectoid composition: Fe - 0.77 wt% C. The transition that determines the micro-structure of the alloy is a solid-state process: Austenite <-> ...