Search found 23 matches

by pmecozzi
Thu Oct 27, 2022 4:00 pm
Forum: solid-solid phase transformations
Topic: Pearlite-to-austenite transformation
Replies: 1
Views: 3937

Pearlite-to-austenite transformation

Dear Bernd, We are currently simulating the pearlite to austenite transformation during heating at 10 °C/s. We set both the ferrite and the cementite as anisotropic phases and the ferrite/austenite and cementite/austenite interface mobility not null for special misorientation. Our aim is to let aust...
by pmecozzi
Tue Jun 14, 2022 11:25 am
Forum: solid-solid phase transformations
Topic: Partition-no-partition transition temperature during pearlite-to-austenite transformation
Replies: 17
Views: 9899

Re: Partition-no-partition transition temperature during pearlite-to-austenite transformation

Dear Bernd,

Many thanks for the clarification. I will keep it in mind also for future simulations.

Kind Regards,

Pina
by pmecozzi
Wed Jun 01, 2022 10:29 am
Forum: solid-solid phase transformations
Topic: Partition-no-partition transition temperature during pearlite-to-austenite transformation
Replies: 17
Views: 9899

Re: Partition-no-partition transition temperature during pearlite-to-austenite transformation

Dear Bernd, Many thanks for your support. Please take all time you need to solve the problem of linearization. It is not urgent. As regards your question about Mn concentration in cementite lamella, I took the values from some experimental data (see the attached picture); then, I assumed some inhomo...
by pmecozzi
Fri May 27, 2022 10:45 am
Forum: solid-solid phase transformations
Topic: Partition-no-partition transition temperature during pearlite-to-austenite transformation
Replies: 17
Views: 9899

Re: Partition-no-partition transition temperature during pearlite-to-austenite transformation

Dear Bernd, Many thanks for the clarification. I realised that I set the “paraTQ” option only for the γ/α and Υ/θ interactions but not α/θ interaction. I repeat the simulation setting “paraTQ” for all three interactions. However, the austenite growth is still weird (see the attached pictures). I wil...
by pmecozzi
Wed May 25, 2022 3:17 pm
Forum: solid-solid phase transformations
Topic: Partition-no-partition transition temperature during pearlite-to-austenite transformation
Replies: 17
Views: 9899

Re: Partition-no-partition transition temperature during pearlite-to-austenite transformation

Dear Bernd I did again the PNTT calculation, this time I did it not including Si, which is in the alloy but was not in the MICRESS simulations. The new PNTT value is lower than the previous one (with Si) and equal to 1021 K. Maybe, this new result can explain the growth of austenite in colony 3. In ...
by pmecozzi
Mon May 23, 2022 10:07 am
Forum: solid-solid phase transformations
Topic: Partition-no-partition transition temperature during pearlite-to-austenite transformation
Replies: 17
Views: 9899

Re: Partition-no-partition transition temperature during pearlite-to-austenite transformation

Dear Bernd, Now, the kinetics of austenite formation and the austenite morphology are in better agreement with the experimental one, probably thanks to the new initial concentration data. However, austenite in colony 3 is still starting to grow at 1026 K when austenite should not grow without the pa...
by pmecozzi
Fri May 20, 2022 10:14 am
Forum: solid-solid phase transformations
Topic: Partition-no-partition transition temperature during pearlite-to-austenite transformation
Replies: 17
Views: 9899

Re: Partition-no-partition transition temperature during pearlite-to-austenite transformation

Dear Bernd,

Many thanks for your suggestions. I am now running a new simulation with the corrected initial concentrations.

I will let you know the results.

Kind Regards,

Pina
by pmecozzi
Thu May 19, 2022 9:35 am
Forum: solid-solid phase transformations
Topic: Partition-no-partition transition temperature during pearlite-to-austenite transformation
Replies: 17
Views: 9899

Re: Partition-no-partition transition temperature during pearlite-to-austenite transformation

Dear Bernd, Here are my answers. - how did you create the initial microstructure? Is it by reading phase structure and compositions from file? It seems that the Mn composition is "sharp" while the phase structure is "smooth". Is it the same for the C-compostion? Did you apply "initialisation" of int...
by pmecozzi
Wed May 18, 2022 12:17 pm
Forum: solid-solid phase transformations
Topic: Partition-no-partition transition temperature during pearlite-to-austenite transformation
Replies: 17
Views: 9899

Re: Partition-no-partition transition temperature during pearlite-to-austenite transformation

Dear Bernd, Thanks for the replay. Your explanation of the Partition-No partition Transition Temperature (PNTT) is correct. The pearlite to austenite transformation can proceed without the redistribution of the substitutional element (Mn in our case) only if the activity of the carbon activity in γ ...