Intro to Austenite h 上游充通大粤 SHANGHAI JIAO TONG UNIVERSITY 1538 Aδ+L 1495℃ 1500 B 1394 L Y+L 1227℃ 1148℃ C L+Fe:C Y E Mother of pearl 1000 G I 912 Y+Fe;C As Acml I727C(A1) AP 1 +FeC I 1 500 I L 00.02 0.77 2.11 4.30 6.69 Fe Fe;C C Concentration / Pearlite K.Chen 6
K. Chen Intro to Austenite 6 C Concentration /% Temperature /ºC Pearlite Mother of pearl
Intro to Austenite 上游充通大粤 SHANGHAI JIAO TONG UNIVERSITY Actual transformation temperatures: Y Heating:Aci,Ac3,Accm ACcm ACm G Cooling:Ari,Ar3,Arcm a+y Y+Fe;C Ac stands for arret chauffant (stop heating) A,stands for arret refroidissement(stop &+Fe;C cooling) Q wcX100 K.Chen 7
K. Chen Intro to Austenite 7 Actual transformation temperatures: - Heating: ACl, AC3, Accm - Cooling: Arl,Ar3, Arcm 𝜶𝜶 + 𝜸𝜸Temperature /ºC - Ac stands for arret chauffant (stop heating) - Ar stands for arret refroidissement (stop cooling)
Intro to Austenite 上游充通大粤 SHANGHAI JIAO TONG UNIVERSITY In Fe-C system:austenite solid solution of C in fcc Fe Interstices in FCC structure. (a)Octahedral void. (b)Tetrahedral void. (a) (b) ●.Regular site atoms K.Chen 8
K. Chen Intro to Austenite 8 In Fe-C system: austenite solid solution of C in fcc Fe Interstices in FCC structure. (a)Octahedral void. (b)Tetrahedral void. >