Influence of laser powder bed fusion build orientation on the corrosion resistance of CoCrWMo alloy considering dislocation density character and lattice microstrain.

ABSTRACT: This study investigates the impact of build orientation on the corrosion resistance of CoCrWMo alloys fabricated by Laser Powder Bed Fusion (L-PBF). Samples printed at angles from 0° to 90° were characterized using SEM, XRD (with modified Williamson-Hall and Warren-Averbach analysis), and potentiodynamic polarization in Ringer's solution. The results revealed that build orientation strongly affects microstrain, dislocation density, and dislocation character, which in turn govern passive layer composition and corrosion behavior. The sample printed at 90° exhibited the highest corrosion resistance, correlating with the lowest dislocation density, minimal microstrain, and the highest fraction of screw dislocations. XPS analysis showed this sample had the most Cr-rich passive layer, with Cr₂O₃

SUBMITTER: Stanislawska A 

PROVIDER: S-EPMC12753813 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature