Revisiting the influence of the scanning speed on surface topography and microstructure of IN718 thin walls in directed energy deposition additive manufacturing

Controlling the mechanical properties of metallic parts produced by additive manufacturing remains challenging. The behavior is mainly related to microstructure, which depends on process parameters and strategies. scanning speed one key that can be modulated during (according kinematic machine tool) in order reach different microstructures. Thus, this work, an experimental study laser metal powder directed energy deposition conducted analyze influence macroscopic geometry, surface topography, microstructure. To do so, a series single-layer experiments has been establish empirical relationship between power, flow-rate hand, layer height width other hand. In addition, six multi-layer thin-walled structures have for various powers speeds determine association with features, topography This approach opens interesting long-term perspectives better control microstructures DED.