Solidification simulation of direct energy deposition process by multi-phase field method coupled with thermal analysis

摘要

In this study, solidification microstructure evolution for a titanium alloy in direct energy deposition is simulated by the multi-phase field method (MPFM) coupled with temperature distributions obtained by thermal analyses using the finite element method (FEM). Temporal thermal distribution for single-track and single-layer laser melting deposition is simulated by the FEM under the direct energy deposition process condition. The MPFM coupled with the thermodynamics database of calculation of phase diagrams is applied to elucidate the solidification microstructure evolution. The comparison between experimental and simulation results of the microstructure evolution confirms a columnar-to-equiaxed transition.