About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
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Symposium
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Environmental Degradation of Additively Manufactured Alloys
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Presentation Title |
Stress Corrosion Cracking Susceptibility of Additively Manufactured 2xxx-series Aluminum Alloys Produced by Selective Laser Melting (SLM) |
Author(s) |
Kevin R. Chasse, Preet M. Singh, Jamshad M. Mahmood, Crosby T. Owens, Michael Van Order |
On-Site Speaker (Planned) |
Kevin R. Chasse |
Abstract Scope |
Two additively manufactured, 2xxx-series aluminum alloys (1.8 to 7.0% copper) produced by selective laser melting (SLM) were evaluated for stress corrosion cracking (SCC) susceptibility in chloride-containing environments relative to an AA2024-T3 wrought counterpart. Constant extension rate testing (CERT) were conducted in 3.5% NaCl and coupons were characterized following the test. The chloride concentration and effect of an oxidizer, i.e., hydrogen peroxide, were also studied using CERT. Polarization scans were used to assess the electrochemical behavior in the NaCl environments. Results of the experiments implied that the SLM alloys were mildly susceptible to intergranular SCC in chloride environments, but were less susceptible than their AA2024-T3 wrought counterpart. Electrochemical potential and the presence of hydrogen peroxide shifted the corrosion mode to intergranular corrosion and pitting. These SLM alloys are promising for aerospace applications where high strength and good corrosion resistance are required, however, SCC susceptibility could limit their implementation in structural applications. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |