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Fayl:Iron carbon phase diagram.svg

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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.
Español: Diagrama de fases hierro-carbono a presión atmosférica

Este diagrama está delimitado por hierro puro a la izquierda y carburo de hierro a la derecha. Las fases principales son:

  • Hierro: ferrita, acero ferrítico
  • Hierro: austenita, acero austenítico
  • Carburo de hierro: cementita, Fe₃C.

Se muestran un eutéctico y un eutectoide; estas fases cristalizan como un apilamiento de finas tiras de fases puras (hierro y cementita) en el caso del eutectoide, o un hierro puro con pequeñas esferas de cementita en el caso del eutéctico. Aunque heterogéneo, estas fases se comportan como cuerpos puros homogéneos.

El acero contiene entre 0 y 2,06 % en masa de carbono. El hierro fundido contiene entre 2,06 y 6,67 %.

Las líneas negras indican la fase metaestable Fe/Fe₃C; las rojas, la fase estable Fe/Carbono.

Este diagrama es solo para fines ilustrativos y no es termodinámicamente preciso.
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