MICRESS Forum

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...

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

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...

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...

Dear Stéphane, That sounds reasonable. The basic idea of the seed density model does neither have shielding nor nucleation rates, so, in principle, having infinitely small checking intervals and a shield distance of 0 (or shield time of 0) is perfect. We have left the shield effect available just fo...

Dear Sean, At the first glimpse it looks as if grid resolution would be too low, but only at the first glimpse. Given that you use mob_corr, low resolution would rather result in slow brick-like growth with straight interfaces. Furthermore, you say that you already have checked that... I cannot test...

Dear Stephane, I think that the 1D_temp approach indeed is the best one for your case, because it allows combining temperature gradients with the effects of latent heat which you need for the seed density nucleation approach. In case you don't have a fast moving heat source like in L-PBF, perhaps a ...

Dear Stephane, When it comes to simulate grain size in case of equiaxed solidification, like Janin I would always prefer the seed-density model (together with latent heat release or 1d-temperature solver). The reason is that what you observe - a decreasing grain size with increased cooling rate - is...

Dear tatalemon, I have run your two driving files which you have sent me by PM, but I do not get the problems which you have faced ("floating divide by zero" and "floating overflow", resp.). One of the examples runs reasonably well (at least technically) with all solid phases appearing. The second o...

Dear tatalemon, The simulation does not behave exactly as you describe, but there are some catastrophic errors : 1.) When I run the files you sent me using MICRESS version 6.402, the code stops during input in section "Phase Diagram - input data" because it does not allow defining the matrix compone...