Effect of "Number of steps to adjust profiles of initially"
Posted: Tue Sep 30, 2014 10:20 am
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 are set in MICRESS initially as gamma prime and the rest as gamma. It means that the region around the gamma prime eutectic is oversaturated regarding gamma prime phase formation up to temperature close to the dissolution of theses particles. I allow for nucleation of gamma prime phase in the matrix. As expected the gamma phase is nucleating and growing. However, depending on the initial choice of the number of steps mentioned above, an unwished effect occurs: Setting this value to 1 seemed to be the choice giving the most realistic results. However, this leads to a complete dissolution of gamma prime in the second time step of the simulation followed by nucleation of my (600 allowed) gamma prime particles and a subsequent regrowth of the original gamma prime and the new gamma prime around. The problem is that the original gamma prime phase now consists of many different grains and I need to choose a large number of allowed gamma prime nuclei (600) in order to have enough newly formed (small) gamma prime phase around the original eutectics. This increases the calculations times massively and would not be required if the gamma prime would not disappear in the first step.
Maybe you have some ideas on how to prevent this?
Best regards,
Ralf
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 are set in MICRESS initially as gamma prime and the rest as gamma. It means that the region around the gamma prime eutectic is oversaturated regarding gamma prime phase formation up to temperature close to the dissolution of theses particles. I allow for nucleation of gamma prime phase in the matrix. As expected the gamma phase is nucleating and growing. However, depending on the initial choice of the number of steps mentioned above, an unwished effect occurs: Setting this value to 1 seemed to be the choice giving the most realistic results. However, this leads to a complete dissolution of gamma prime in the second time step of the simulation followed by nucleation of my (600 allowed) gamma prime particles and a subsequent regrowth of the original gamma prime and the new gamma prime around. The problem is that the original gamma prime phase now consists of many different grains and I need to choose a large number of allowed gamma prime nuclei (600) in order to have enough newly formed (small) gamma prime phase around the original eutectics. This increases the calculations times massively and would not be required if the gamma prime would not disappear in the first step.
Maybe you have some ideas on how to prevent this?
Best regards,
Ralf