Austenite Formation from Ferrite using MICRESS Examle
Posted: Wed Apr 03, 2019 6:12 pm
Hi all.
I'm trying to simulate austenite formation from ferrite during intercritical annealing and I started by manipulating one of the MICRESS standard examples.
I have a few confusion regarding how to edit the example drive file to reverse the transformation:
(1) How are the phase assigned? i.e. is phase 1 always ferrite and 2 always austenite, or is phase 1 always the parent phase and phase 2 the daughter phase?
(2) Can I simply exchange the phase interaction data of phase 1 and phase 2 in your example file? I think that includes changing data for phase interaction (interfacial energy and mobility) and diffusion data, as well as entropy of transformation. I wonder if I missed anything.
(3) My steel has a C content of 0.035 wt% which is above the solubility of C in ferrite. I wonder how I should input my linearized phase diagram. One of the lines should be the γ/α+γ line but I'm not sure about the other one. Should I use the α+γ/α+Fe3C line or should I use the γ/α+γ line? I guess if I use the former, I will have to extend the line and calculate the temperature difference to the α+γ/α+Fe3C line as the critical "undercooling" or minimum nucleation temperature.
I think my simulation is reasonable by examining the concentration profile of C (austenite has higher C content, see attached figure). I attached a working example (modified drive file) in 2D. Component 1 is C and 2 is Mn.
Thanks in advance,
Billy
I'm trying to simulate austenite formation from ferrite during intercritical annealing and I started by manipulating one of the MICRESS standard examples.
I have a few confusion regarding how to edit the example drive file to reverse the transformation:
(1) How are the phase assigned? i.e. is phase 1 always ferrite and 2 always austenite, or is phase 1 always the parent phase and phase 2 the daughter phase?
(2) Can I simply exchange the phase interaction data of phase 1 and phase 2 in your example file? I think that includes changing data for phase interaction (interfacial energy and mobility) and diffusion data, as well as entropy of transformation. I wonder if I missed anything.
(3) My steel has a C content of 0.035 wt% which is above the solubility of C in ferrite. I wonder how I should input my linearized phase diagram. One of the lines should be the γ/α+γ line but I'm not sure about the other one. Should I use the α+γ/α+Fe3C line or should I use the γ/α+γ line? I guess if I use the former, I will have to extend the line and calculate the temperature difference to the α+γ/α+Fe3C line as the critical "undercooling" or minimum nucleation temperature.
I think my simulation is reasonable by examining the concentration profile of C (austenite has higher C content, see attached figure). I attached a working example (modified drive file) in 2D. Component 1 is C and 2 is Mn.
Thanks in advance,
Billy