Muddiest Point- Phase Diagrams V: Fe-Fe3C Microstructures

This video answers the most frequently asked questions students have about iron- iron carbide phase diagram microstructures. If you have any questions or comments, please leave them in the comments section.
To download the slide set from this video, visit this site: www.slideshare.net/mseasuslide...
To study the vocab used in this video, visit this site: quizlet.com/20699470/53-steel-...
This work was supported by NSF Grants #0836041 and #1226325.

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I just learned more in 11 minutes about phase diagrams than my professor taught me all semester. Thank you!

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[@bennazhajamal3260]

First, I would like to thank you Professor for this pedagogic effort. After your permission, I would like to come back to the first cooling of the liquid C0 40. When we cool the liquid from 300°C to 225°C then 184°C we see from the diagram (Pb-Sn) that phase weight compo. is increasing in terms of Sn from 0.207 at 225°C to 0.502 at 184°C that explains the growing of the alpha crystals and the decreasing of the space occupied by the liquid.
Furthermore, when following the curve on the left where we have alpha we can see that the comp of Sn increases when we come down to 184°C and at the sometime the Pb comp decreases in alpha.
But in your interpretation professor you said that the crystals of alpha were rejecting Sn which is the contrary according to the latest remarks!!!
For me, the alpha crystal should reject Pb instead of Sn because when we follow that part of the curve the comp of Sn increases and that of Pb decreases.
The some remark can be made on the right of the diagram when you explain the beta formation.
I will be so glad to know your reply to that and I would like to thank you for your efforts because I learnt a lot of details from you.

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[@adamalsaqqa8983]

how to calculate the total weight percent ferrite (pro-eutectoid ferrite and eutectoid ferrite
together) ?

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[@nicke8958]

I fully understand your teachings of the Iron-Carbon Phase Diagram, but could you make me sure of whether the Gamma Phase Fraction, is 0.38% and not 0.34% which was shown in the video at 5:52

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[@AnaHernandez-nb1wy]

Which book can i use as reference?

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[@hoodiejolo]

Is the proeutectoid (ferrite or cementite) always present in the microstructure even at temperatures more than just 1 degree after the eutectoid transformation, say 100 degrees C after?

[@shox91]

Proeutectoid can be ferrite or cementite, Depends if it's hypo og hyper- eutectiod. if its hypoeutectiod it's ferrite, if its hypereutectoid its cementite :)
Best Regards.
Mechanical Engineer
From Norway

[@shox91]

And it can be proeutectoid as long as it is below the liquidus-line and over the solidus-line. Proeutectoid means before eutectoid (Pearlite) occurs.

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where's the eutectoid microstructures at the eutectoid temperature?

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