| Abstract Scope |
Graphene nanoplatelets (GNPs) offer a promising route for enhancing the performance of nickel-based superalloys fabricated by additive manufacturing. In this study, Inconel 718 (IN718) metal matrix composites containing 0.1 wt.% and 0.4 wt.% GNPs were fabricated using laser powder bed fusion (LPBF). The effects of GNP addition on densification behavior, microstructure, hardness, tensile properties, and fatigue performance were investigated and compared with LPBF-processed pure IN718 and conventionally wrought IN718. Relative density measurements were conducted to evaluate processability and defect formation, while microstructural characterization was used to examine grain morphology, melt pool features, and reinforcement distribution. Mechanical testing assessed the influence of GNP content on hardness, strength, ductility, and fatigue resistance. The results provide insights into the feasibility of incorporating graphene-based reinforcements into LPBF-fabricated superalloys and establish processing–structure–property relationships for the development of high-performance metal matrix composites for demanding engineering applications. |