About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
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| Symposium
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Additive Manufacturing: Advanced Characterization with Synchrotron, Neutron, and In Situ Laboratory-scale Techniques III
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| Presentation Title |
Unraveling Microstructural Impacts Governing the Pitting Corrosion Behavior in L-PBF 316L Stainless Steel |
| Author(s) |
Mingxi Ouyang, David J. Sprouster, Gary P. Halada, Steven Storck, Jason Trelewicz |
| On-Site Speaker (Planned) |
Mingxi Ouyang |
| Abstract Scope |
In laser powder bed fusion (L-PBF) 316L, the heterogeneous microstructures that form due to sharp thermal gradients and solidification rates have a profound impact on the localized corrosion behavior. Past reports on the governing mechanisms have identified chemical segregation of Cr and other species as a critical factor, which is inextricably tied to the high density of defects in L-PBF materials. In this study, we employ synchrotron X-ray diffraction and absorption spectroscopy to characterize this defect state and its connection to chemical heterogeneities. Combined with cyclic voltammetry and Mott-Schottky analysis, we provide evidence for correlations between reduced breakdown potentials (i.e., enhanced pitting) and the lattice parameter, suggesting contributions from residual stress. On this basis, we performed systematic X-ray residual stress measurements to map the dependence of the localized corrosion behavior on residual stress state and demonstrate the interdependency between printing parameters, microstructure, and pitting corrosion behavior in L-PBF 316L. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Additive Manufacturing, |