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 |
Effect of Heat Treatment on the Stress Corrosion Cracking Behavior of an Additively Manufactured 7050 Aluminum Alloy Produced by Selective Laser Melting (SLM) |
Author(s) |
Kevin R. Chasse, Crosby Owens, Rupesh Rajendran, Preet M Singh |
On-Site Speaker (Planned) |
Kevin R. Chasse |
Abstract Scope |
An additively manufactured, high-strength 7050 aluminum alloy (Al-Zn-Mg-Cu) produced by selective laser melting (SLM) was evaluated for stress corrosion cracking (SCC) susceptibility in chloride-containing environments relative to an 7050 wrought plate. Alloys were overaged for different amounts of time to assess effect of heat treatment on SCC and localized corrosion. Constant extension rate testing (CERT) and sustained load testing were conducted in 3.5% NaCl. Coupons were characterized for evidence of SCC following the tests. Scanning vibrating electrode technique (SVET) was also used to assess the electrochemical behavior associated with microstructural features on select samples. Results of these experiments are showing that the SLM alloys are generally resistant to SCC in chloride environments in all heat treatments and are less susceptible than their 7050 wrought counterpart. Electrochemical potential differences near precipitates imply that extended overaging can increase localized corrosion susceptibility in chloride environments. Further work is ongoing for these materials. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Environmental Effects, Aluminum |