Abstract:Different temperature annealing treatments were conducted on a laser powder bed melted FGH4096M nickel-based superalloy. The microstructure of the alloy was analyzed using SEM and EBSD, while tensile tests were performed to investigate the impact of the annealing process on the microstructural evolution and mechanical properties of the laser powder bed melted FGH4096M superalloy. The results reveal that as the annealing temperature increases, dendritic and columnar crystals gradually disappear in the formed alloy; a significant precipitation of γ′ phase is observed when the annealing temperature is 900 ℃. Additionally, there is a gradual increase in hardness until 800 ℃, along with an upward trend in both tensile strength and yield strength; however, fracture elongation rate remains low at only 5%. Analysis of grain orientation difference distribution indicates that annealing can partially eliminate residual stress. These research findings provide valuable data support for enhancing the performance of laser powder bed melted nickel-based superalloys.