Abstract:
Numerical modeling of selective laser melting (SLM) process has been performed based on the enthalpy formulation of the nonlinear heat conduction problem for a multi-phase medium. A three-dimensional nonstationary problem of formation of a melted pool under a moving laser beam and consequent solidification of the pool were numerically simulated. The geometrical parameters of single and multiple tracks as a function of laser beam power and speed were investigated. The results obtained from the simulation were compared with experimental data. Reasons for the discrepancy between calculated and experimental data were discussed. For the purpose of further estimation of fatigue resistance under long-term high-frequency loading the geometrical structure and mechanical properties and imperfections of emerging in multi-track multi-layer simulation were studied.