Fe-Fe;C phase diagram T Isomorphous Eutectic L D L+A 1148℃ C L+Fe3C A (A+F3C) F G Eutectoidic A+ a Ld+Fe3CI A+F Fe:CI A+Ld+Fe3CI 727℃ F P (F+iFe3C K 2 P+Ld'+FesCn Ld' Ld'+Fe3CI P+F P+Fe:Cu (P+Fe3C) 0.0218%C 0.77%C 2.11%C 4.3%C 6.69%C Fe Fe3CFe - Fe3C phase diagram A C D E F G S P Q 1148℃ 727℃ L A L+A L+ Fe3CⅠ 0.0218%C 2.11%C 4.3%C 6.69%C Fe Fe3C T° ( A+Fe3C ) Ld Ld+Fe3CⅠ A+Ld+Fe3CⅡ F A+F A+ Fe3CⅡ ( F+ Fe3C ) P P+F 0.77%C P+Fe3CⅡ P+Ld’+Fe3CⅡ Ld’ Ld’+Fe3CⅠ K Eutectic Eutectoidic Isomorphous ( P+Fe3C )