Additive Manufacturing (AM) is a process that enables production of complex intricate geometries that are difficult to produce through conventional manufacturing, especially the metallic materials that are difficult to machine. Therefore, the manufacturing of such complex shaped parts can be performed by metal AM techniques like laser beam powder bed fusion (LB-PBF) process, which gained considerable attention in recent times. Consequently, this has developed a significant interest in producing parts made of superalloys like Alloy 718. The investigated as-built LB-PBF Alloy 718 exhibits the microstructure with presence of inevitable defects, microstructural heterogeneity, etc. that can raise concerns regarding the property of material. Such material-oriented concerns can be addressed by thermal post-treatmen tcomprising of hot isostatic pressing (HIP) and heat treatment (HT). The focus of the study is to understand the effect of thermal post-treatment that are appliedLB-PBF built Alloy 718partto improve its properties.The possibility to reduce the duration of thermal post treatment.The as-built LB-PBF Alloy 718material, exhibiting uniform microstructure throughout the build was exposed to thermal post-treatments namely HIP and heat treatment, involving solution treatment and aging. The effect of these treatments was analysed in terms of defect content, grain structure, microhardness, and phases constituents in the material. Subjecting the specimens to HIP treatment significantly reduced the internal defect content and dissolved the Laves phase, which were present in the as-built condition. Moreover, grain growth was typically observed after HIP treatment. The studied results also showed prospects for reducing the temperature and duration of HIP treatment, which was also beneficial in limiting grain growth. The hardness values of HIPed samples were reduced due to the dissolution of the major strengthening γ" phase, which was later recovered during heat treatment. The solution treatment led to precipitation of the δ phase at inter and intra-granular regions. During aging the increase in hardness was evident and attributed to the re-precipitation of significant amount of γ" phase. Through the study of microstructural evolution during aging treatment, the plateauing of hardness was revealed after certain duration revealing a possibility to significantly reduce the duration of commonly applied long aging treatment on LB-PBF built Alloy 718. The obtained hardness value of short HIPed and short aged sample was similar to the sample treated with standard long thermal post treatment procedure. Overall, the results show possibility for reduction in duration for the thermal post-treatment cycle.