Search found 203 matches

by CharMIC
Sat Mar 14, 2020 4:23 pm
Forum: solid-solid phase transformations
Topic: Modification of chemical potential for elements at GB
Replies: 3
Views: 59

Modification of chemical potential for elements at GB

Hi,

Is there a way to modify chemical potential of an element at a grain boundary in MICRESS?

BR
Chamara
by CharMIC
Wed Jan 08, 2020 3:24 am
Forum: solidification
Topic: Simulation of solidification of Gamma prime alloy during SLM process
Replies: 43
Views: 2878

Re: Simulation of solidification of Gamma prime alloy during SLM process

Hi Bernd In MC phase, apart from C, Cr and Al composition reach values that is more than 10 times its usual values. Hf, Ta and Ti do not fluctuate. However, in fcc phase almost all the element fluctuate. see the attached image. in the image I have defined isolines with values -0.01 and 50 at%. # 0 -...
by CharMIC
Tue Jan 07, 2020 4:19 pm
Forum: solidification
Topic: Simulation of solidification of Gamma prime alloy during SLM process
Replies: 43
Views: 2878

Re: Simulation of solidification of Gamma prime alloy during SLM process

I tried limiting C in MC between 30 and 50 at%. Still I see the composition fluctuate above 50%. I get error =10209 indicating that limit criteria has been violated (if I am correct). also I get error = 30201. Do I need to limit some other elements also? I see negative C nd Hf compositions in some l...
by CharMIC
Tue Jan 07, 2020 9:03 am
Forum: solidification
Topic: Simulation of solidification of Gamma prime alloy during SLM process
Replies: 43
Views: 2878

Re: Simulation of solidification of Gamma prime alloy during SLM process

Hi Bernd, When I look at the composition (in at%) in MC and FCC_A1, I Hf and C composition fluctuating a lot. especially I get negative compositions in FCC_A1. I tried first defining limits (min 0, max 50) for C composition in both MC and fcc phase. But I see still C composition goes to negative val...
by CharMIC
Mon Jan 06, 2020 9:09 am
Forum: solidification
Topic: Simulation of solidification of Gamma prime alloy during SLM process
Replies: 43
Views: 2878

Re: Simulation of solidification of Gamma prime alloy during SLM process

Dear Bernd,

Thanks for the reply. what cause to get the Error=3 and Error =1. Is this specific for problems in .GES file?
by CharMIC
Sat Dec 21, 2019 4:54 am
Forum: solidification
Topic: Simulation of solidification of Gamma prime alloy during SLM process
Replies: 43
Views: 2878

Re: Simulation of solidification of Gamma prime alloy during SLM process

Dear Bernd, Now I am doing the same simulation using TTNI8/MOBNI1. This is because TCNI8 did not give good equilibrium description of the alloy. in TTNI8 i have 1. FCC_A1 (gamma), 2. FCC_A1#2(MC) 3. GAMMA_PRIME. during the simulation I get error=3 and error=1611. they come during relinearisation. Th...
by CharMIC
Tue Aug 20, 2019 11:29 am
Forum: pre-processing
Topic: How grain boundary diffusion works
Replies: 18
Views: 4556

Re: How grain boundary diffusion works

Yes. the value that I get is smaller than the bulk value. but has the same sign.

In practice should't it be higher than the bulk value?
by CharMIC
Fri Aug 16, 2019 12:41 pm
Forum: pre-processing
Topic: How grain boundary diffusion works
Replies: 18
Views: 4556

Re: How grain boundary diffusion works

Hi Bernd

when you have set the parameters correctly, the D_GB physical out put in .diff file should be larger than the bulk diffusion coefficient value ?
by CharMIC
Fri Aug 09, 2019 1:15 pm
Forum: solidification
Topic: Data for further nucleation
Replies: 51
Views: 6016

Re: Data for further nucleation

that would be OK, I think. we can give it a try