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Non-equilibrium phases are shown for their time and transformation using _________

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Non-equilibrium phases are shown for their time and transformation using _________

(a) Fe-Fe3C diagram

(b) TTT diagram

(c) CCT diagram

(d) TTT and CCT diagram

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I'm obligated to ask this question of Transformation Diagrams topic in section Heat Treatment of Engineering Material & Metallurgy

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The correct answer is (d) TTT and CCT diagram

To elaborate: Ferrite, cementite, pearlite, and austenite are equilibrium phases which are based on the iron-iron carbide equilibrium diagram. For other non-equilibrium phases like martensite and bainite, the Fe-Fe3C diagram cannot be used. In such cases, we use the TTT and CCT diagrams.

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