Change of cementite from ferromagnetic to paramagnetic character

Q.  In Iron-Carbon equilibrium diagram, at which temperature cementite changes from ferromagnetic to paramagnetic character?
- Published on 11 Sep 15

a. 190 oC
b. 210 oC
c. 276 oC
d. None of the above

ANSWER: 210 oC

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    Discussion

  • Sravanthi   -Posted on 21 Nov 15
    - Critical temperature is defined as the temperature at which transformations in solid state take place.

    - At 210°C cementite changes from Ferromagnetic to Paramagnetic character. This temperature is indicated at the bottom portion of iron carbon equilibrium diagram. It is denoted by A0.

    - The temperature below 768°C is known as curie temperature. Below this temperature α-Ferrite becomes ferromagnetic.

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