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