About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
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Environmental Degradation of Additively Manufactured Alloys
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Presentation Title |
Tailoring Microstructure in Additively Manufactured Stainless Steels for Enhanced Corrosion Performance |
Author(s) |
Jason Trelewicz, David J. Sprouster, Gary Halada, Joseph J. Sopcisak, Steven M. Storck |
On-Site Speaker (Planned) |
Jason Trelewicz |
Abstract Scope |
In laser additively manufactured 316L, enhanced pitting susceptibility has been discussed in the context of the cellular microstructure that forms during printing. Interestingly, some studies also report on laser printed samples with seemingly enhanced stability against pitting relative to wrought 316L. The complexity of these highly heterogeneous microstructures has thus made it difficult to identify the mechanisms governing localized attack, and in turn design printed alloys with performance exceeding their wrought counterparts. In this study, we explore the microstructural underpinnings of localized corrosion in laser additively manufactured 316L using multi-modal characterization techniques. The dislocation density and its dependence on printing conditions are correlated to chemical heterogeneities formed at the nanoscale. On this basis, accelerated pitting is attributed to depletion of Cr and carbide formation in regions of high dislocation density. We finally show that ceramic dopants can inhibit accelerated pitting corrosion by augmenting the chemical state of the cellular walls. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Environmental Effects, Iron and Steel |