M

Mr. Dubey • 52.30K Points
Coach 

Q. Which material is present above the upper critical temperature line in an iron carbon phase diagram?

(A) martensite
(B) pearlite
(C) ledeburite
(D) austenite
Correct : Option (D)

Explanation: 
 above the upper critical line in a iron carbon phase diagram, all the material is austenite while below the lower critical no austenite material exists.

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