[SY-F4] Solidification Simulation in Additive Manufacturing Process of Ti-Alloy by ICME approach
Multi-phase field method (MPFM) coupled with thermodynamics database of calculation of phase diagrams (CALPHAD) is a powerful tool for simulating solidification microstructure evolutions in engineering casting processes. As MPFM is based on local (quasi-)equilibrium assumption in solidification theory, applying MPFM to solidification of additive manufacturing (AM) processes is considered to be difficult because of extremely large cooling rate and temperature gradient.
On the other hand, some researchers have recently reported experimental observations of the columnar-to-equiaxed transition in the solidification of the AM processes. These observations suggested that the local (quasi-)equilibrium assumption can be applied to the solidification of the AM processes.
In this study, AM processes of Ti-alloys are simulated. By using temperature distributions obtained by thermal analyses in finite element method simulations, solidification microstructures are calculated by MPFM. It is confirmed that the microstructures have the columnar-to-equiaxed transitions. The results are summarized in a solidification map for the AM process conditions.
On the other hand, some researchers have recently reported experimental observations of the columnar-to-equiaxed transition in the solidification of the AM processes. These observations suggested that the local (quasi-)equilibrium assumption can be applied to the solidification of the AM processes.
In this study, AM processes of Ti-alloys are simulated. By using temperature distributions obtained by thermal analyses in finite element method simulations, solidification microstructures are calculated by MPFM. It is confirmed that the microstructures have the columnar-to-equiaxed transitions. The results are summarized in a solidification map for the AM process conditions.