6.1 components and phases in Fe-C alloy The Fe-Fe3C diagram contains the following solid phases:a ferrite,austenite (y),cementite (Fe3C) andδferrite. a ferrite(F):an interstitial solid solution of carbon in a-Fe.Carbon is slightly soluble in a ferrite,the maximum solid solubility is 0.0218%at 727C Austenite(y/A):an interstitial solid solution of carbon in y-Fe.Austenite has a much higher solid solubility for carbon than a ferrite,the maximum solid solubility is 2.11%at 1148C Cementite (Fe3C):the intermetallic compound, with a composition of 6.69%C and 93.1%Fe. Hard and brittle.The Fe-Fe3C diagram contains the following solid phases: α ferrite, austenite (γ), cementite (Fe3C) and δ ferrite. α ferrite(F): an interstitial solid solution of carbon in α-Fe. Carbon is slightly soluble in α ferrite, the maximum solid solubility is 0.0218% at 727℃ Austenite(γ/A): an interstitial solid solution of carbon in γ –Fe. Austenite has a much higher solid solubility for carbon than α ferrite, the maximum solid solubility is 2.11% at 1148℃ Cementite (Fe3C): the intermetallic compound, with a composition of 6.69% C and 93.1% Fe. Hard and brittle. 6.1 components and phases in Fe-C alloy