MICRESS Forum

Dear Bernd, from a first fast test, I can see that using avg 1.0 max 100 smooth 45.0 is infact stabilizing the interface. I have to check your suggested dimension / time issues. However, also with these options there is a negative driving force at 45°, ... and a positive driving force at 90°, ... be...

Hello, coming back to this topic I am wondering about the following effect: I am simulating a MC-carbide (FCC_A1#2) in some Ni-based matrix. Initially I assume spherical particles. When I start the simulation, at the interfaces at 0°, 90°, ... of the sphere, actually a driving force for dissolution ...

Dear Bernd, using "database global" and leaving away the broken constraint for component 7 in MC is now leading to quite stable calculations. Still some slight instabilities are present at the liquid / MC interface (which is probably not so critical for our application). They are connected to spots ...

Dear Bernd, thank you for your suggestions. In fact, your values significantly improved the stability of the simulation. Also excluding the jumping of MICRESS into the FCC_A1#1 composition set was important. In principle, now even simulations in the system Ni-Al-C-Co-Cr-Fe-Mo-Nb-Ti run. I am now usi...

Dear all, I am currently trying to model the incipient melting of niobium carbide particles in a nickel-matrix. I am using simply a cubical particle for test purposes. In principle, liquid phase is formed at the interface between both phases – as expected. But I am getting numerical instabilities, w...

Dear Bernd, in fact this is no critical issue for us. As long as I am not allowing for nucleation of new gamma prime phase within the matrix, the microstructure is stabilized very easily by MICRESS in the first steps. This probably happens because we anyway limit the phase boundary mobility at lower...

Hello, I am wondering about the effect of the setting of "# Number of steps to adjust profiles of initially sharp interfaces?". We are using initially measured composition fields. It is the microstructure of a superalloy containing gamma matrix and eutectic gamma prime phase. These eutectic regions ...

Dear Bernd, we would like to perform MICRESS-calculations in rapid succession (directly operated by a MATLAB-script). To ensure a fast and stable process we are looking for an abort criterion in order to stop and to skip calculations which display numerical problems. Is there any possibility to defi...

Hello Bernd, in fact it seems to be the best solution to use a temperature dependent mobility, then the test simulation runs stable as it should. Our goal is to suppress secondary gamma prime phase precipitation below its gamma prime solvus temperature. This would occur because our input concentrati...

Hi Bernd, your hints were useful, thank you! When I go on, I would like to be able to simulate the same setup (i.e. a given concentration field) heating it up from very low temperatures. This is for studying the behaviour during the beginning of a heat treatment. However, if a phase interaction betw...