| Abstract Scope |
The unique solidification pathways in additively manufactured (AM) metallic materials create distinct microstructures compared to those processed by conventional processing, resulting in significant differences in corrosion behavior. These differences arise from compositional variations across multiple length scales, localized residual stresses, and the formation of non-equilibrium microstructures. However, the influence of these microstructural features on corrosion and stress-corrosion cracking remains poorly understood. In this study, we systematically investigate the corrosion behavior of AM alloys, with a focus on Ni-based superalloys in salt water environments, an area critical to offshore oil and gas infrastructure as well as aerospace applications. To elucidate the microstructural origin of their corrosion response, a combination of advanced characterization techniques, including in-situ Raman Spectroscopy, in-situ Scanning Electron Microscopy, and high-energy X-ray diffraction, was employed. Our findings demonstrate that microstructural features associated with local chemistry and defects have a profound impact on corrosion kinetics and degradation mechanisms. |