Fe_Cu

solid-solid phase transformations, influence of stresses and strains
Post Reply
shaojielv
Posts: 100
Joined: Thu Apr 01, 2021 2:16 pm
anti_bot: 333

Fe_Cu

Post by shaojielv » Wed Apr 06, 2022 11:42 am

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
Attachments
Fe_Cu.dri
(23.89 KiB) Downloaded 159 times
FE_cU.png
FE_cU.png (53.84 KiB) Viewed 10289 times

shaojielv
Posts: 100
Joined: Thu Apr 01, 2021 2:16 pm
anti_bot: 333

Re: Bainite model

Post by shaojielv » Wed Apr 06, 2022 4:13 pm

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

Bernd
Posts: 1504
Joined: Mon Jun 23, 2008 9:29 pm

Re: Fe_Cu

Post by Bernd » Fri Apr 08, 2022 12:04 pm

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

shaojielv
Posts: 100
Joined: Thu Apr 01, 2021 2:16 pm
anti_bot: 333

Re: Fe_Cu

Post by shaojielv » Fri Apr 08, 2022 1:10 pm

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

Bernd
Posts: 1504
Joined: Mon Jun 23, 2008 9:29 pm

Re: Fe_Cu

Post by Bernd » Fri Apr 08, 2022 2:34 pm

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

shaojielv
Posts: 100
Joined: Thu Apr 01, 2021 2:16 pm
anti_bot: 333

Re: Fe_Cu

Post by shaojielv » Sun Apr 10, 2022 10:09 am

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
Attachments
vate.png
vate.png (34.08 KiB) Viewed 10252 times
phase.png
phase.png (54.13 KiB) Viewed 10252 times

admin
Site Admin
Posts: 56
Joined: Fri Jun 13, 2008 4:03 pm

Re: Fe_Cu

Post by admin » Mon Apr 11, 2022 10:23 am

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

Post Reply