element concentrations

[shaojielv]

Dear everyone

I have a question that I would like to consult with you. In the simulation of solid phase transiformation, everything is very good. However, after I changed a group of different element concentrations, why did the change of phase transiformation result become so big and there was a big problem?

[Bernd]

Sorry, shaojielv,

we need more information to answer this question...

Best regards
Bernd

[shaojielv]

Dear, Bernd

Thank you very much for your reply, and I will further explain the problem. The concentration in the left picture is 0.1C-1.5Mn, which indicates that the result is very normal. The right picture is the result when I changed the concentration to 0.05C-0.5Mn, and the other parameters have not changed. I hope to get your help.

[Bernd]

Dear shaojielv,

The most probable reason for the differences is the altered equilibrium temperature: By reducing the amount of alloying elements, the equilibrium temperature is increased, leading to a higher undercooling/driving force and hence to a faster transformation rate. This in turn leads to front instability and finer microstructures.

Thus, to obtain comparable results, you should change temperature such that a comparable undercooling is reached (use Thermo-Calc equilibrium calculation, or check dG value of initial linearisation parameters in MICRESS .log-output).

Bernd

[shaojielv]

Dear Bernd,

Thank you very much. The problem has been solved according to your suggestion. Wish you a happy life.

lv