| Abstract Scope |
Laser powder bed fusion (LPBF) enables rapid production of high-performance Ni-based superalloy components for defense manufacturing applications requiring elevated-temperature strength, material adaptability, and accelerated alloy development. This study investigates tungsten (W) feedstock modification of IN718 powders prepared through powder mixing and mechanical alloying routes to expand the compositional design space of LPBF superalloys. W-modified IN718 powders with varying W contents were processed under selected LPBF parameters, and fabricated specimens were evaluated for processability, surface characteristics, melt pool stability, microstructural evolution, and tensile performance at room temperature and approximately 600°C. Results show that both W content and feedstock preparation route influence LPBF response, surface condition, and microstructural features, producing measurable effects on elevated-temperature mechanical behavior. This work demonstrates refractory-element feedstock modification as a practical strategy for tailoring established superalloy powders for defense-relevant propulsion, structural, and thermal-management applications operating in demanding high-temperature environments. |