The effect of SLM parameters on porosity, microstructure and mechanical properties is studied. To this purpose, the Selective Laser Melting (SLM) technology is applied to manufacture Inconel 718 specimens. The material, the manufacturing process, the Hot Isostatic Pressure (HIP), heat treatment, observation procedures and characterisation of mechanical properties are presented. A columnar-dendritic microstructure was observed on all the SLM specimens and a Volumetric Energy Density (VED) effect on the latter was also noted. The rate of porosity varies in relation to the VED and is considerably reduced after HIP. The heat treatment erases the dendritic microstructure, significantly enhances microhardness and confers on the alloy tensile mechanical properties comparable to forged Inconel 718.

研究了SLM参数对孔隙率，微观结构和力学性能的影响。为此，选择性激光熔化（SLM）技术被应用于制造Inconel 718样品。介绍了材料，制造工艺，热等静压（HIP），热处理，观察程序和机械性能表征。在所有SLM标本上均观察到柱状树突状微观结构，并且还注意到了后者的体积能量密度（VED）效应。孔隙率相对于VED有所不同，并且在HIP之后大大降低了。热处理消除了树枝状显微组织，显着提高了显微硬度，并赋予了合金与锻造的Inconel 718相当的拉伸机械性能。