Scanning speed-induced surface roughness change and its impact on the corrosion resistance of IN718 fabricated by laser powder bed fusion

Abstract

This study investigates the influence of scanning speed on surface roughness and its impact on the corrosion resistance of IN718 fabricated using Laser Powder Bed Fusion (LPBF). Three scanning speeds (760 mm/s, 800 mm/s, and 840 mm/s) were applied, and the surface roughness, microhardness, and electrochemical properties were analyzed. The results reveal a significant discrepancy between the optimal scanning speed for achieving superior mechanical properties and that required for maximizing the LPBF-fabricated alloy’s corrosion resistance performance. More specifically, this study highlights the critical role of scanning speed on the corrosion behavior of LPBF IN718, providing practical guidance and insights for achieving the simultaneous enhancement of both mechanical properties and corrosion resistance by printing parameter optimization in LPBF-fabricated materials.