MICRESS Forum

Hi Chamara, No, what I meant here was generally eliminating any off-diagonal terms which make trouble. In practice, what you can observe is e.g. that a chess-pattern is formed for certain elements. This typically is the case for 2 strongly interacting elements, while others indirectly follow to a sm...

Yongliang Ou, Most probably, the interface mobility is reduced due to a too high value of the minimum time step. Please note that the definition of a minimum time step is done for performance reasons only and cannot be done before the setup of the simulation is finished successfully. Time stepping c...

Dear Lv Shaojie, sounds as if you could use an approach like I did some years ago: B.Böttger, M.Apel, B.Santillana, and D.G.Eskin Relationship Between Solidification Microstructure and Hot Cracking Susceptibility for Continuous Casting of Low-Carbon and High-Strength Low-Alloyed Steels: A Phase-Fiel...

Dear Lv shaojie, The cooling rate which you apply in MICRESS refers to the temperature at the bottom of the simulation domain, irrespective of the phase or material which is there. If you furthermore define a temperature gradient (in z-direction of the domain), then the temperature in other regions ...

Dear Lv shaojie, If you are interested in precipitation of a second phase during grain growth, you probably are thinking about particle pinning effects on grain growth. In MICRESS, this topic can most easily be addressed by using the "particle_pinning" model. Then you do not have to treat precipitat...

Dear Lv shaojie, Growth rate and cooling rate are two completely different quantities, which are linked by the temperature dependency of the driving force for phase transformation. Admittedly, in solidification processes this link is quite strong: d(ΔG)/dT = ΔS ~ 1 J/(Kcm 3 ) As I explained for your...

Dear Lv shaojie, The phase-field equation of MICRESS is based on a Helmholtz energy approach, which means that temperature is an independent variable and thus is considered as a boundary condition. This means, that most typically temperature is defined as an initial temperature cooling rate, althoug...

Hi Kamran, Based on the explanations for your process, I propose the following procedure: 1.) You start from a suitable MICRESS standard example, I would suggest A004_Gamma_Alpha_TQ_dri. You can adapt the chemistry of your system as well as the length scale to your needs. 2.) Interchange ferrite and...

Dear Kamran, I am still struggling to understand the physical background of the process which you describe. What I understand is that you assume that there are two competitive processes: the recrystallisation of martensite (i.e. nucleation and growth of new martensite grains, with a reX-energy lower...

Dear Mauro, No, there is not yet a standard MICRESS example existing for these types of temperature cycling. Basically, thermal cycling is achieved in MICRESS by using time-dependent temperature boundary conditions. Depending on the type of process, they can be applied in different ways. In case of ...