Structure of austenite phase - Iron-Carbon diagram

Q.  Austenite phase in Iron-Carbon equilibrium diagram  _______
- Published on 11 Sep 15

a. is face centered cubic structure
b. has magnetic phase
c. exists below 727 oC
d. all of the above

ANSWER: is face centered cubic structure

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    Discussion

  • Sravanthi   -Posted on 21 Nov 15
    - Iron-Carbon system of alloys, phase composition and their transformations occurred during cooling or heating are described in iron-iron equilibrium diagram.

    - Iron-Carbon equilibrium diagram consists of the following phases:

    1) Li: It contains liquid solution of carbon in iron.

    2) Austenite: It is the interstitial solid solution of carbon in γ-iron. It does not exist below 727 °C and has face centered cubic structure. Austenite is soft, ductile, malleable and non-magnetic.

    3) δ- ferrite: It is solid solution of carbon in iron which is soft and ductile. It has body centered cubic structure.

    4) Cementite: It has 6.67% carbon content and has complex orthorhomic crystal structure. Cementite has 12 iron atoms and 4 carbon atoms in each unit cell.

    5) Ledeburite: It consists eutectic mixture of pearlite and cementite and is observed in cast irons which contain 4.3 % carbon.

    6) Transformed ledeburite: This structure consists of pearlite and cementite and is also called as transformed ledeburite.

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