Additive manufacturing (AM) creates three-dimensional objects by depositing materials layer by layer. Selective laser melting (SLM) is one of the important AM processes used for metal. In SLM the fully melt metal transforms into a solid three-dimensional part. This process allows for faster, more complex, and less time-consuming manufacturing. The material INCONEL718 (IN718) is a nickel superalloy used due to its good weldability and can be processed using a variety of manufacturing technologies. More than 50 process parameters control the quality of SLM-manufactured components. The process parameters control the performance parameters. The anisotropic behavior is observed in the IN718. In this research, the superalloy IN718 was created by additive manufacturing (AM) using a selective laser melting approach, and the post-AM thermal treatments were evaluated. The effect of heat treatment on mechanical properties is observed using UTS and Hardness as performance and heat treatment’s impacts on microstructure, process-induced flaws, and microstructural behavior were investigated using Scanning Electron Microscopy (SEM). The samples are simulated using the SIMUFACT ADDITIVE to calculate the yield stress. The microstructure and tensile characteristics of Inconel 718 superalloy were seen to be improved by ageing treatment. © 2023, The Author(s), under exclusive licence to Springer-Verlag France SAS, part of Springer Nature.