Search found 20 matches

by billyzhangubc
Wed Apr 01, 2020 3:51 pm
Forum: recrystallisation/grain growth
Topic: Place randomly distributed nuclei
Replies: 8
Views: 1270

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...
by billyzhangubc
Wed Apr 01, 2020 1:14 am
Forum: recrystallisation/grain growth
Topic: Place randomly distributed nuclei
Replies: 8
Views: 1270

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...
by billyzhangubc
Fri Mar 06, 2020 3:28 am
Forum: recrystallisation/grain growth
Topic: "Grain radius" in grain input (v 6.402)
Replies: 1
Views: 349

"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...
by billyzhangubc
Thu Mar 05, 2020 7:30 am
Forum: solid-solid phase transformations
Topic: Benchmark 2D single grain growth with square law
Replies: 2
Views: 457

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
by billyzhangubc
Wed Feb 26, 2020 7:27 pm
Forum: solid-solid phase transformations
Topic: Benchmark 2D single grain growth with square law
Replies: 2
Views: 457

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 ...
by billyzhangubc
Sat Dec 14, 2019 6:13 pm
Forum: solid-solid phase transformations
Topic: Nucleation on selected grain boundaries
Replies: 3
Views: 537

Re: Nucleation on selected grain boundaries

Hi Bernd, thanks for your reply. So far, everything is based on experimental observations (microscopy). All these grain boundaries have misorientations >15 degrees and there shouldn't be significant difference in composition (my material is microalloyed steel so it will be difficult to experimentall...
by billyzhangubc
Wed Dec 11, 2019 11:12 pm
Forum: solid-solid phase transformations
Topic: Nucleation on selected grain boundaries
Replies: 3
Views: 537

Nucleation on selected grain boundaries

Hi all, I am simulating austenite formation during intercritical annealing from a ferrite matrix. Nucleation of austenite occurs predominantly at ferrite grain boundaries. Based on my experimental observations, certain ferrite boundaries will not get nuclei. I wonder if there is a way to simulate th...
by billyzhangubc
Fri Sep 13, 2019 12:52 am
Forum: solid-solid phase transformations
Topic: Phase Diagram Input for Multi-component Systems with NPLE
Replies: 7
Views: 1156

Re: Phase Diagram Input for Multi-component Systems with NPLE

Hi Bernd, thank you very much for your reply. With mob_corr my kinetics make more sense. Now under NPLE for Mn and "normal mob_corr" for C, I am able to replicate my DICTRA result (see the plot attached; red curve is the MICRESS result) even after the NPLE-PLE transition. NPLE_PLE_transition_1075_ov...
by billyzhangubc
Tue Sep 10, 2019 3:11 am
Forum: solid-solid phase transformations
Topic: Phase Diagram Input for Multi-component Systems with NPLE
Replies: 7
Views: 1156

Re: Phase Diagram Input for Multi-component Systems with NPLE

Hi Bernd, I have some further questions on a similar system, although not on phase diagrams. I am running (once again) 1D α-to-γ tests on Fe-C-Mn ternary systems with TQ coupling. Under diffusion control, kinetics is usually fast at the beginning (C-diffusion controlled and close to NPLE), reaching ...
by billyzhangubc
Sat Aug 03, 2019 2:00 am
Forum: thermodynamics
Topic: TQ initialization failed
Replies: 1
Views: 855

TQ initialization failed

Hi all, I have tried to start on the TQ coupling function of MICRESS (v6.402 on a linux-based computing cluster) and I started with the AlCu example. I obtained a GES5 file from ThermoCalc 2019a. However, an error message occurred saying "TQ initialization failed!" without more specific explanations...