MICRESS Forum

Dear Bernd, I am currently working on the study of the pearlite to austenite transformation kinetics during fast heating in a Fe-C-Mn pearlitic steel. The aim was to reproduce the morphology of the austenite in the early stage of formation and also the overall transformation kinetics. Some studies h...

Dear Bernd, Many thanks for the replay. Let me first answer your questions. • there is only austenite and cementite present in the simulation, so that nucleation of cementite is only depending on the local temperature and composition? Yes, I consider only cementite as the product phase and its forma...

Dear Bernd, I am currently studying the effect of substitutional alloy elements (Ni, Cr and Mn) inhomogeneity on cementite precipitation during cooling of hyper-eutectoid steel. In the first simulation (see file CarbidePrecipi_at%_cooling_0.4_faceted 8a_ParaTQ) CarbidePrecipi_at%_cooling_0.4_faceted...

Hi Bernd,

I did and then I solve the problem of not growing cementite nuclei! Thanks.

Unfortunately, the increase of the 1/3 interface energy from 2e-6 J/cm^2 to 2e-5 J/cm^2 still did not solve the 1/3 interface instability problem.

Pina

Hi Bernd, Many thanks for the advice. At first, I tried with “atc mob_corr” in the redistribution_control option; in this case, the cementite nuclei neither grow nor shrink (cementite fraction remain constant). Then I reduced the 1/3 interface mobility but the instability problem remains. Afterwards...

Dear Bernd, Many thanks for your replay. I do not understand why the blue spots could be cementite particles. They are in the bulk of FCC phase and no interface crossed this region at an early stage of the simulation; actually, it seems that some carbides are precipitate along some FCC/FCC grain bou...

Dear Bernd, I am simulating the kinetics of cementite formation at low temperature (593 K) starting from an austenite and ferrite microstructure as shown in the figure together with the initial carbon concentration in at%. I linearise the pseudo-phase diagram Fe-C under para-equilibrium condition to...

Dear Bernd, Many thanks for your clarification. I have already changed the input condition for the diffusivity of carbon in FCC from cross-diffusion to diagonal but there were again jumps in the carbon distribution because, I understand now, the diffusivity is derived from the at % of the elements. ...

Dear Bernd, I am now simulating the kinetics of BCC and cementite formation on cooling starting from a FCC microstructure of a Fe-C-Mn-Cr-Ni steel. I attached the initial microstructure. The initial carbon concentration is constant (0.8 wt% C) while the substitutional elements profiles along z-direc...

Hi Bernd,

Many thanks for the further suggestions.
I also attach the tabP file since the numbers that I copied/pasted in the previous e-mail were indeed mixed up.

Best Regards

Pina