(479451722) 10. Iron-carbide phase diagram, Steels, 2014 - 10.1 The Iron Carbide Phase Diagram(STEELS Fe allotropy solid solution BCC 0.09%C solid

(479451722) 10. Iron-carbide phase diagram, Steels, 2014 -...

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10 . 1. Th e I r o n - C a r b i d e P h ase D i a g r am (S T EE L S) - solid solution BCC , 0.09%C - solid solution - AUSTENITE Interstitial solid solution FCC , max solubility 2.14% C - solid solution - FERRITE Interstitial solid solution BCC , max solubility 0.022% C The iron-carbide phase diagram F e - a l l o t r o p y L +Fe 3 C P Fe Steel Cast I ron Fe 3 C Fe 3 C - i r o n ca r b i d e ( C E M E NT I T E ) Interstitial compound, 6.7% C Orthorhombic, Hard & brittle Gordana A. Cingara                                                                                                     1
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1. Peritectic reaction at 1493 0 C: Liquid +   austenite (g) 2. Eutectic reaction at 1147 o C: Liquid austenite ( ) + cementite (Fe 3 C) 3. E u tect o i d r ea c t io n at 727 o C : + Fe 3 C Austenite F erri t e C e m en t i t e PEARLITE (eutectoid mixture )  0.76   Fe 3 C 727 0 C  P P P Fe 3 C PEARLITE 0.76% C, 727 o C Ferrite Austenite PEARLITE microstructure: white matrix (ferrite) + plates (cementite) Fine lamellar mixture Gordana A. Cingara, 3SP3                                                                                                      2
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Transformation of hypoeutectoid steel on slow cooling  P +P P C o 0.76 – hypoeutectoid         P
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+ P P Steel with 0.52%C T= 600 C Lever rule wt% S/(R+S) wt% P = (R/R+S) P Transformation of hypereutectoid steel on slow cooling Fe 3 C  Fe 3 C P P P+Fe 3 C
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Lever rule: steel 1.2%C : 92.7%     Fe 3 C   P P P+Fe 3 C Micrograph of medium- carbon 1040 steel 1010 steel 1095 steel Alloying elements change the Iron-Carbide phase diagram! The eutectoid temperature can be affected! The eutectoid composition can be affected!
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10 . 2. Th e H eat Tr eatme n t o f Ste e l TIME-TEMPERATURE-TRANSFORMATION - (T-T-T) CURVES Eutectoid reaction is fundamental to the microstructure and properties of steels.
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  • Spring '15
  • Austenite, Gordana A. Cingara, Isothermal Transformation Diagrams, BCT

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