English: Iron–carbon phase diagram, at atmospheric pressure
This diagram is limited by pure iron on the left and by iron carbide on the right. The mains phases are:
iron: ferrite, ferritic steel
iron: austenite, austenitic steel
iron carbide: cementite, Fe3C.
It shows a eutectic and a eutectoid; these phases crystallise as a stacking of fine strips of pure phases (iron and cementite) in case of the eutectoid, or a pure iron containing small balls of cementite for the eutectic. Although it is heterogeneous, these phases behave like homogeneous pure bodies.
Steel is between 0 and 2.06 mass percent of carbon. Cast iron is between 2.06 and 6.67%.
Black lines indicate the metastable Fe/Fe3Cphase, red is the stable Fe/Carbon phase
This diagram is for illustrative purposes only, and is not thermodynamically accurate.
Date
Source
Own work
Läpple, Volker - Wärmebehandlung des Stahls Grundlagen, Verfahren und Werkstoffe 8. Auflage, Seite 55ff.
Weißbach, Wolfgang - Werkstofkunde Strukturen, Eigenschaften, Prüfung 17. Auflage, Seite 76ff.
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