Search found 25 matches
- Mon Jul 06, 2020 7:55 pm
- Forum: solid-solid phase transformations
- Topic: Nucleation on selected grain boundaries
- Replies: 6
- Views: 4332
Re: Nucleation on selected grain boundaries
Hi Bernd, Thanks for your explanation and I'm sorry for the confusion. I meant to say >15 degrees. I am trying to do some proof of concept studies to introduce a bainitic initial structure and put austenite nuclei on high angle grain boundaries. I'm glad to know that's possible and the rest is for m...
- Sun Jul 05, 2020 11:58 pm
- Forum: solid-solid phase transformations
- Topic: Nucleation on selected grain boundaries
- Replies: 6
- Views: 4332
Re: Nucleation on selected grain boundaries
Hi Bernd,
Sorry to bring this up again. With "add_to_grain", it possible to place nuclei on selected boundaries based on boundary misorientation angle (for example, only boundaries with <15 degrees misorientation angle)?
Thanks,
Billy
Sorry to bring this up again. With "add_to_grain", it possible to place nuclei on selected boundaries based on boundary misorientation angle (for example, only boundaries with <15 degrees misorientation angle)?
Thanks,
Billy
- Mon Jun 15, 2020 9:50 pm
- Forum: thermodynamics
- Topic: Driving force calculation for NPLE with TQ
- Replies: 4
- Views: 6865
Re: Driving force calculation for NPLE with TQ
Thanks Bernd! Apparently I was confused by the notations of these terms. Billy
- Wed Jun 10, 2020 8:41 am
- Forum: thermodynamics
- Topic: Driving force calculation for NPLE with TQ
- Replies: 4
- Views: 6865
Re: Driving force calculation for NPLE with TQ
Hi Bernd, Thanks for your reply. Just a few follow-up questions: (1) Just to confirm, the total "local" driving force is the sum of quasi-equilibrium driving force \Delta G_0 and \chi(T) (c^C_\gamma - c^C_{\gamma*}) (or generalized to a system with n components, \sum_{i=1}^{n}\chi_i(T) (c^i_\gamma -...
- Tue Jun 09, 2020 3:50 am
- Forum: thermodynamics
- Topic: Driving force calculation for NPLE with TQ
- Replies: 4
- Views: 6865
Driving force calculation for NPLE with TQ
Hi all, I have a few questions regarding the determination of ΔG for the α-to-γ transformation with the NPLE model. Here are the questions. Say I have Fe, C and Mn: (1) I assume that ΔG is calculated by χ(C_γ-C*_γ) in MICRESS with TQ where C_γ is the local composition, C*_γ is the "equilibrium C con...
- Wed Apr 01, 2020 3:51 pm
- Forum: recrystallisation/grain growth
- Topic: Place randomly distributed nuclei
- Replies: 8
- Views: 9558
Re: Place randomly distributed nuclei
Hi Billy, You should not restrict the number of nuclei, neither per seed type ("maximum number of new nuclei") nor per time step ("Max. number of simultaneous nucleations?"). This often leads to erratic grain distributions (if you do not use it for the exact purpose), because it just stops nucleati...
- Wed Apr 01, 2020 1:14 am
- Forum: recrystallisation/grain growth
- Topic: Place randomly distributed nuclei
- Replies: 8
- Views: 9558
Re: Place randomly distributed nuclei
Hi Bernd, Sorry for a late follow-up. Hope you are doing well. I am now simulating intercritical austenite formation from ferrite that involves nucleation. A major problem I have at the moment is that austenite nuclei are not quite randomly distributed (esp. comparing to a micrograph; see images att...
- Fri Mar 06, 2020 3:28 am
- Forum: recrystallisation/grain growth
- Topic: "Grain radius" in grain input (v 6.402)
- Replies: 1
- Views: 4980
"Grain radius" in grain input (v 6.402)
Hi all, The "(minumum/maximum) grain radius" in the random option of grain input seems a bit misleading. For example, I would like to generate a structure of 5 round grains with a mean diamater of 80 μm (with periodic boundary conditions). I did a quick calculation and a box of 160x160 μm will be ab...
- Thu Mar 05, 2020 7:30 am
- Forum: solid-solid phase transformations
- Topic: Benchmark 2D single grain growth with square law
- Replies: 2
- Views: 3823
Re: Benchmark 2D single grain growth with square law
Hello Janin,
Thanks for your answer and sorry for the late reply. My colleague tried your method just now and got the correct result.
Billy
Thanks for your answer and sorry for the late reply. My colleague tried your method just now and got the correct result.
Billy
- Wed Feb 26, 2020 7:27 pm
- Forum: solid-solid phase transformations
- Topic: Benchmark 2D single grain growth with square law
- Replies: 2
- Views: 3823
Benchmark 2D single grain growth with square law
Hi all, Asking on behalf of a colleague: My colleague is doing some benchmark work on grain growth. Basically he started by modelling the shrinkage of a single round grain inside an infinitely big grain (using periodical boundary conditions). He adapted the model from a recrystallization simulation ...