About this Abstract |
Meeting |
2025 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2025)
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Symposium
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2025 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2025)
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Presentation Title |
Stress-Corrosion Behavior of Magnesium Alloy AZ91 Manufactured by Laser Powder Bed Fusion |
Author(s) |
Chelsea O'Donnell, Alejandro Avila, Bradley Kauffman, Adrian Passinger, Robert Stewart, David Scott Fernander, Michael P. Sealy |
On-Site Speaker (Planned) |
David Scott Fernander |
Abstract Scope |
The goal of this research was to reduce corrosion susceptibility of laser powder bed fusion additively manufactured magnesium alloy AZ91 for aerospace and marine applications. Laser power, scan speed, and build plate proximity were varied from ideal parameters to investigate the correlation between energy density, porosity, and corrosion. To test the hypothesis that increased porosity accelerates stress-corrosion failure through localized pitting and stress concentrations, experiments were conducted in a 2% salt solution including unloaded open circuit potential and potentiodynamic polarization tests followed by 60 MPa tensioned PDP tests. Tensioned samples generally exhibited higher corrosion resistance, and changes in laser power increased corrosion rates. Suboptimal scan speeds increased lack of fusion pores and under-melting which increased corrosion while samples closer to the build plate exhibited higher corrosion resistance. Further testing is needed to identify parameters that consistently achieve optimized corrosion rates for various industries. |
Proceedings Inclusion? |
Planned: Post-meeting proceedings |