Carbon,at.% 0 10 20 30 3000 ■ 2880°C G Pra=1 atm Solubility of graphite in liquid Fe boiling point 2500 2420°C Pre=0.1 atm Iron-cementite 20002083C PFe=0.01 atm equilibria -Iron-graphite Solubility of carbon 6Fe equilibria -----Curie temperature 1538° 1500 11495 C of ferrite 一。一 Uncertain region 1394 2.08 12270C of cementite(fe,C】 (yFe) 1154C 4.26 Austenite 111489C 4.30 6.89 1000 9120C 2.11 738°C 770 Solubility of carbon in austenite 0.77 727◆C 0.88 500 (afe】 FeaC Ferrite 230°C Fe22C Solubility of carbon in ferrite 2 3 4 5 6 10 11 12 Carbon,wt% Fig.1 Phase diagram for the binary Fe-C system.Source:Ref 1.7条温度线 7条成分线