Additive manufacturing of Inconel 718: A review on microstructures and mechanical properties of DED-LB-processed samples

Additive manufacturing (AM) is a process in which parts are manufactured in a layer-by-layer fashion. Several AM methods have been successfully developed to produce complex geometries and process different materials. Regarding metallic alloys with aerospace applications, directed energy deposition (DED) stands out due to its high deposition rate and superior build quality. Inconel 718 (IN718) is a precipitation-hardened nickel-based superalloy renowned for its exceptional mechanical properties and resistance to oxidation and corrosion at elevated temperatures, up to 650 °C. The alloy derives its strength primarily from the precipitation of γ′ (Ni 3 (Al, Ti)) and γ″ (Ni 3 Nb), with additional strengthening from solid solution elements and carbides. Due to its thermal stability, fatigue resistance, and creep performance, IN718 is widely used in aerospace engines, gas turbines, and petrochemical equipment. This work presents a review of IN718-processed via Laser-based DED, exploring recent studies on microstructural evolution, mechanical properties, and post-processing treatments. Graphical abstract