| Abstract Scope |
Wire Arc Additive Manufacturing (WAAM) is a cost-effective and efficient technique offering high deposition rates, reduced material waste, and suitability for large-scale metallic components compared to other additive methods. However, defects in WAAM-fabricated stainless steel remain a challenge. This study investigates the effect of 2% Nb addition on the microstructure, mechanical, and tribological properties of WAAM-deposited 312LSi stainless steel. Samples were fabricated at 0°, 67°, and 90° build orientations with interlayer times of 2 and 5 minutes. Microstructural analysis was performed using EBSD, SEM, EDS, and XRD. Mechanical and wear behavior were evaluated through hardness and pin-on-disk tests. Results show that build orientation significantly affects tribological performance, with COF values of 0.57–0.64 (0°) and 0.55–0.58 (67°). Nb addition improved microstructural stability and wear resistance, highlighting its potential for enhancing WAAM-fabricated materials. |