Determine the Fe-C Equilibrium Diagram

AI Thread Summary
The discussion centers on plotting the iron-carbon (Fe-C) phase diagram, highlighting two main approaches: experimental and theoretical methods. The experimental approach involves varying temperature and carbon content in iron to observe resulting microstructures, while the theoretical method uses simulations to determine atomic interactions and configurations. The extensive research on steel has produced a widely referenced pseudo-equilibrium phase diagram, which includes cementite that may decompose over time. For those seeking accuracy, it is suggested to seek out the true equilibrium phase diagram.
tututu87
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Any equations or methods to plot Fe-C equi. diag?
Thx!
 
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Hi tututu87, welcome to PF. Are you referring to the iron-carbon phase diagram? If so, there are two strategies: experimental (vary the temperature and the amount of C in Fe and determine the microstructure at each combination) and theoretical (simulate atomic interactions to identify the lowest-energy configuration).

Fortunately, the importance of steel has motivated decades of research (mostly experimental) in these areas, culminating in an Fe-C phase diagram that you can just look up in the literature.

A caveat: the most frequently used Fe-C phase diagram is a pseudo-equilibrium (or metastable) phase diagram, containing a phase (cementite) that will eventually decompose, albeit slowly. Will a little extra effort, you can find the true equilibrium diagram.
 
thx!
Really appreciate it!
 

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