Question:
In Iron-Carbon equilibrium diagram, the Eutectic point is at
In Iron-Carbon equilibrium diagram, the Eutectic point is at
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Eutectic = 4.3% (higher C, higher T); Eutectoid = 0.8% (lower C, lower T).
Updated On: Jul 4, 2026
- 4.3% C and 1147$^{\circ}$C
- 4.3% C and 727$^{\circ}$C
- 0.8% C and 727$^{\circ}$C
- 0.8% C and 1495$^{\circ}$C
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The Correct Option is A
Solution and Explanation
Step 1: Concept
The Eutectic reaction in the Fe-C system is the transformation of liquid into two solid phases (Austenite and Cementite) simultaneously upon cooling.
Step 2: Meaning
This is the lowest melting point of the alloy system for cast irons.
Step 3: Analysis
The Eutectoid point (Pearlite) occurs at 0.8% C and 727$^{\circ}$C. The Eutectic point occurs at a higher carbon content of 4.3% and a temperature of 1147$^{\circ}$C.
Step 4: Conclusion
The correct coordinates for the Eutectic point are 4.3% Carbon and 1147$^{\circ}$C. Final Answer: (A)
The Eutectic reaction in the Fe-C system is the transformation of liquid into two solid phases (Austenite and Cementite) simultaneously upon cooling.
Step 2: Meaning
This is the lowest melting point of the alloy system for cast irons.
Step 3: Analysis
The Eutectoid point (Pearlite) occurs at 0.8% C and 727$^{\circ}$C. The Eutectic point occurs at a higher carbon content of 4.3% and a temperature of 1147$^{\circ}$C.
Step 4: Conclusion
The correct coordinates for the Eutectic point are 4.3% Carbon and 1147$^{\circ}$C. Final Answer: (A)
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