Modeling the Effect of Beam Shaping at Selective Laser Melting
The influence of the laser-beam radial distribution of the energy flux density is theoretically studied for the Gaussian distribution (mode TEM00), and doughnut distribution of TEM01* mode for the values of the Peclet number from 0 to 3. The model of linear thermal conduction in the target indicates that profile TEM00 is the best for thermo-activated treatment processes that can be accomplished in a wide temperature range and profile TEM01* can be advantageous for a narrow range of the permissible processing temperature. If the phase transitions of melting/solidification and evaporation are included into the model, the estimate of the width of the laser-treated band is reduced but the tendencies predicted by the linear model are not changed.
C. E. Protasov and A. V. Gusarov, "Modeling the Effect of Beam Shaping at Selective Laser Melting", Materials Science Forum, Vol. 834, pp. 85-92, 2015