Influence of laser parameters on segregation of Nb during selective laser melting of Inconel 718

A transient three-dimensional powder-scale model was established for understanding the flow field and mass transfer within molten pool during selective laser melting (SLM) of Inconel 718 alloy by considering some important physical phenomena, such as, a transition from powder to solid, nonlinearities produced temperature-dependent materials’ properties, fluid in calculation. The influence power or scanning speed on cooling rate discussed detail. simulation results reveal that motion higher promote benefit solute distribution increasing power. However, with speed, melt are elevated, resulting an agglomeration elements, which is ascribed shorter dwelling time liquid. Therefore, segregation Nb can be effectively suppressed decreasing decrease