MICRESS Forum

Dear Bernd,

Thank you for your reply. I will try my best to solve the transformation of bainite, but I still have some other questions to consult with you. Thank you very much.
In addition, I am doing the precipitation of copper-rich phase in Fe_Cu binary alloy, where phase 1 is BCC and phase 2 is FCC, but the simulation is very slow. I have adjusted relevant parameters, but the phase content is shown in the figure, so I really need your help.
I have attached the relevant driver files and their phase content results.

Best wishes,
lv

Dear Bernd,

And I think I should add that if I raise the temperature up to about 1700 kelvin the phase transition is basically normal.

lv

Dear lv,

If you have concerns about simulation speed, you should have a look at the .TabP output in a first place. There, you can see which solver or part of the code is responsible for the high calculation times (see here).

Or did you mean that the phase transformation is very slow?

Bernd

Dear Bernd,

Yes, the response is so slow that I think there is something wrong with my model, do you think it is my model? If the model is ok I will try it with more time.

lv

Dear lv,

Why do you expect the transformation to be faster? The transformation can be expected as diffusion limited, and solid diffusion is slow at these temperatures. You cannot compare the kinetics to γ-α-transformations in steel, because carbon is diffusing orders of magnitude faster, and other substitutional elements do not need to diffuse in steel because of their high solubility in both phases. This is different in the Fe-Cu-system.

You should further check whether the fcc phase has the correct composition in your simulation, because there is a second fcc phase with lower Cu-content present in the phase-diagram, which could also form.

Bernd

Dear Bernd

I think this is not just because of the slow reaction speed. I tested the evolution of time to 3000s, but this is not a normal reaction, but I did not find the cause of the error.

lv

Dear lv,

What means "not a normal reaction"? According to the results you post, many small nuclei are formed which did not yet reach bigger size due to slow transformation rate.

Bernd