|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||Environmental Degradation of Additively Manufactured Alloys
||Structure and Semiconducting Properties of the Passive Film Formed on Additively Manufactured 316L Stainless Steel
||Gary Halada, Jason Trelewicz, Mingxi Ouyang, Nylette Lopez, Jurek Sadowski, Ryan Hulchanski
|On-Site Speaker (Planned)
The ultrathin passive layer formed on stainless steel is critical to corrosion performance, acting as a kinetic and electronic barrier to ingress of aggressive ions such as Cl. Understanding this layer, and in particular its homogeneity and its transport properties, enable us to determine the impact of additively manufactured alloy microstructure and post-print heat treatment on electrochemical properties and hence performance in service conditions. 316L stainless steel printed via Laser Powder Bed Fusion with variations in print parameters and post-print heat treatment (which result in variations in dislocation density and surface stress) are polarized in 0.1M HCl and the resulting passive layer studied via Mott-Schottky analysis, laboratory-based X-ray Photoelectron Spectroscopy, and synchrotron-based X-ray photoemission electron microscopy and low energy electron microscopy. The results show a correlation between passive film structure, electronic and transport properties, and underlying alloy print-formed microstructure which can facilitate design of AM alloys for enhanced environmental performance.