MICRESS Forum

Dear Bernd, Thank you for the response. True, for now, I am trying to keep the interfaces stable and only allowing diffusion of elements. Attached are the .korn and .GES5 files. I have already sent you the input file (in.txt). Please, let me know if you need any further information. Thank you. Best ...

Dear Bernd, I have a similar issue. The diffusion coefficients suddenly go into negative values and I see this error (NaN). Intermediate output for t = 30.000 s CPU-time: 3644 s Current phase-field solver time step = 1.00E+00 s Average conc. of comp. 1 = NaN, Variation = NaN at% Average conc. of com...

Dear Bernd, Defining the element concentration in 'at%' helped to solve the problem :D Regarding the negative values, it is working fine at higher temperatures (500-600 °C, 0.5secs relinearization interval). At 400°C I tried to use a relinearization interval of 0.05 seconds and still I get negative ...

Dear Bernd, Thank you for the reply. Regarding diffusion of Mn: When I run the simulation for the FeMn system. Mn diffuses as it is expected to (nothing @ 400°C and very slow at 600°C). So, for solving the 'diffusion length' problem of Mn in a ternary system, is it better to define the element conce...

Dear Bernd, I am using a ThermoCalc coupling to define phase diagram (FeCMn). I did define the concentration of each component in each phase individually (as I treat Acicular ferrite as Martensite). I defined redistribution behaviour of C - normal, Mn - nple. I also observed that using the database ...

Dear Bernd, I want to use the microstructure alone. So, I tried to create an ASCII file from the Korn file of step 1 and used as input for the 2nd step. I am giving constant initial concentration for both C and Mn in the next step. My question is, if adding another alloying element 'X' in the 2nd st...

Dear Bernd, I have a question regarding selection of initial microstructure for a ternary system during a heat treatment. Step 1: I created an initial microstructure with 40% austenite and 60% ferrite (by quenching from 100% austenite) with a binary system (FeC). Step 2: I am using this final micros...

Dear Bernd,
Thank you so much.Yes, I solved the issue. Seems like, coupling with Thermocalc is the best to do when we have more than 1 alloying element.

Sudhindra.

Dear Bernd,
I have attached a driving file. Could you please tell me what is wrong with this file. No phase is growing. There was a slight trace of transformation at 30secs and then it disappears.
Thank you.

Best regards,
Sudhindra.

Dear Bernd, Thank you for the suggestions :) The second option sounds good (it was also my idea). Identifying the difference between Gibbs free energy of ferrite and austenite. At certain point it becomes '0' (point of diffusionless transformation, isn't it?). I am still trying to figure out how to ...