About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
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Symposium
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Additive Manufacturing of Metals: Microstructure, Properties and Alloy Development
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Presentation Title |
The Effects of Microstructure and Chemistry on Corrosion Behavior in Additively-manufactured 316L Stainless Steel |
Author(s) |
Ryan Khan, Michael Melia, Michael Heiden, Sara Dickens, Paul Kotula, Frank DelRio |
On-Site Speaker (Planned) |
Ryan Khan |
Abstract Scope |
Stainless steels are an important class of alloys in a variety of different structural applications. This is due in large part to their corrosion resistance, and the formation of an oxide passivation layer. In additively manufacturing (AM) stainless steels formed via powder bed fusion (PBF), processing parameters such as scan speed and laser power strongly affect the local microstructure and thereby their corrosive behavior. In this study, we employed X-ray computed tomography, white-light interferometry, electron backscatter diffraction, transmission electron microscopy, electrochemical impedance spectroscopy, and Kelvin probe force microscopy to elucidate the multiscale behavior of AM 316L stainless steel and uncover how local changes in microstructure, chemistry, and surface potential track to large scale corrosion. Moreover, five different PBF samples with varying manufacturing parameters were studied to shed light on the variability of the behavior with processing. SNL is managed and operated by NTESS under DOE NNSA contract DE-NA0003525. |