Fe-C Phase Diagram Gibbs-Comp Slopes

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SUMMARY

The discussion focuses on the slopes of the Fe-C phase diagram at specific temperatures, namely 1003K and 1573K. At 1003K, the transformation from ferrite to pearlite is highlighted. At 1573K, two critical phase boundaries are discussed: the austenite solidus and the austenite liquidus. The slope of the austenite solidus is 216K/%C with an accuracy of +/- 3K/%C, while the slope of the austenite liquidus is 107K/%C with an accuracy of +/- 7K/%C.

PREREQUISITES
  • Understanding of phase diagrams, specifically the Fe-C phase diagram.
  • Knowledge of Gibbs Free Energy and its application in phase transformations.
  • Familiarity with temperature-dependent phase boundaries in metallurgy.
  • Basic skills in interpreting slope calculations in thermodynamic contexts.
NEXT STEPS
  • Research the detailed Fe-C phase diagram and its significance in materials science.
  • Study the principles of Gibbs Free Energy in phase transitions.
  • Explore the implications of temperature on phase boundaries in alloy systems.
  • Learn about experimental methods for determining phase diagram slopes in metallurgical studies.
USEFUL FOR

Materials scientists, metallurgists, and engineers involved in the study of phase transformations in iron-carbon alloys will benefit from this discussion.

Ottherif
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I need a Slopes Of Fe-C Phase Diagram. Gibbs Free Energy-Composition This following tempreatures... 1003K and 1573K. Thanks For All Replies...:frown: :frown:
 
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At 1003K is the ferrite -> pearlite transformation.

At 1573K, there are two phase boundaries, the austenite liquidus and the austenite solidus. Which one do you need ? (I assume you are not interested in the cementite melting curve)

Also how much accuracy do you need in the slopes ? My accurate data is in the lab, and I won't get there till tomorrow.

Right now, I can give you a couple of not so accurate numbers.

Slope of austenite solidus @ 1573K = 216K/%C (+/- 3K/%C)
Slope of austenite liquidus @ 1573K = 107K/%C (+/- 7K/%C)
 

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