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At what temperature does δ ferrite melt?

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At what temperature does δ ferrite melt?

(a) 1674 F

(b) 1990 F

(c) 2541 F

(d) 2800 F

This question was posed to me in quiz.

My question comes from Iron and Iron Carbide System topic in section Constitution of Alloys and Phase Diagrams of Engineering Material & Metallurgy

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Right answer is (d) 2800 F

For explanation: δ ferrite is formed as a BCC phase due to heating of austenite at 2541 F. This δ  ferrite finally melts at 2800 F and these changes are plotted on the iron-iron carbide equilibrium diagram.

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