Search found 1506 matches
- Sun Mar 31, 2024 8:37 pm
- Forum: solidification
- Topic: Predicting of PDAS
- Replies: 3
- Views: 527
Re: Predicting of PDAS
Dear Sean, I think your approach of comparing the "stability" of the dendrite array before and after full overgrowth of the smaller dendrite is wrong. One should rather focus on the question whether a smaller dendrite can growth side-to-side with a bigger one, even if there are small fluctuations of...
- Thu Mar 21, 2024 6:19 pm
- Forum: tips and tricks
- Topic: Temperature - profiles_from_file tool
- Replies: 1
- Views: 640
Re: Temperature - profiles_from_file tool
Hi Mauro, If you mean with "200 data points" that you have 200 time steps with corresponding 200 temperature profiles, then you are right, and unfortunately there is currently no other way how to input that into the driving file. Do you have a proposal how we could simplify this procedure? If we wou...
- Thu Mar 21, 2024 4:00 pm
- Forum: solidification
- Topic: Predicting of PDAS
- Replies: 3
- Views: 527
Re: Predicting of PDAS
Hi Sean, In principle, the unit cell approach with KGT-calibrated interface mobility is a good basis for investigation of the PDAS. However, your conclusion, that the invariance of the tip temperature with changing PDAS (i.e. domain size) would indicate the stable PDAS value, is wrong. The tip under...
- Tue Feb 13, 2024 2:00 pm
- Forum: solidification
- Topic: 3D Simulation of direct solidification
- Replies: 5
- Views: 612
Re: 3D Simulation of direct solidification
Hi Sean, it seems you applied the factor of 16 also to the kinetic anisotropy coefficient, which is not correct: It should be only the static one! Thus, you are missing kinetic anisotropy. This, although physically viable, is not useful with phase-field simulations which are not extremely fine resol...
- Tue Feb 06, 2024 5:00 pm
- Forum: solidification
- Topic: 3D Simulation of direct solidification
- Replies: 5
- Views: 612
Re: 3D Simulation of direct solidification
Dear Sean, Nice to hear from you. Your simulation results look very nice! Let me try to start with the first question about the anisotropy coefficients. Unfortunately it is difficult to get physical values, and there is no general strategy what to do then. But on top of that problem, I think there i...
- Mon Feb 05, 2024 2:52 pm
- Forum: solidification
- Topic: using appropriate phase to mimic substrate layer in LPBF process
- Replies: 1
- Views: 306
Re: using appropriate phase to mimic substrate layer in LPBF process
Dear Hanyu, Welcome to the MICRESS Forum! You describe a case where 2 phases can equally well grow as primary phase and thus compete with each other. This means, the question which one will prevail or overgrow the other strongly depends on the nucleation conditions for each phase. And the opportunit...
- Tue Dec 26, 2023 3:40 am
- Forum: solid-solid phase transformations
- Topic: Broad interfaces
- Replies: 3
- Views: 56866
Re: Broad interfaces
Dear Roscoe, Possibly, the problem is due to multi-binary demixing, as indicated by the error messages. In that case, the solution would be using diagonal redistribution (keyword "diagonal" in section phase diagram input for version 6.4) which anyway is recommended for non-dilute alloys. However, it...
- Fri Dec 08, 2023 2:08 pm
- Forum: solidification
- Topic: Dendritic growth under high cooling rates
- Replies: 7
- Views: 94531
Re: Dendritic growth under high cooling rates
Dear Peter,
No, you misunderstood me - you just need to replace the wrong input "avg 0.5" by the correct value of the interface energy!
Bernd
No, you misunderstood me - you just need to replace the wrong input "avg 0.5" by the correct value of the interface energy!
Bernd
- Fri Dec 08, 2023 1:14 pm
- Forum: solidification
- Topic: Dendritic growth under high cooling rates
- Replies: 7
- Views: 94531
Re: Dendritic growth under high cooling rates
Dear PeGr, The error message you get from MICRESS looks a bit strange, because input errors in the 1/1-, 2/2-, and 3/3-phase interactions are not correctly recognized. Instead of specifying a value for the interface energy, you input "avg 0.5". This is obviously wrong, but not directly recognized as...
- Wed Dec 06, 2023 2:01 pm
- Forum: solid-solid phase transformations
- Topic: Broad interfaces
- Replies: 3
- Views: 56866
Re: Broad interfaces
Dear Roscoe, What you experience is a broadening (spreading) of the interface due to numerical problems. There can be many reasons for interfaces to get unstable. The most typical are: - too low grid resolution - too high interface mobility (if no mobility correction is used) - missing diffusion - t...