About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
|
Symposium
|
Development of Light Weight Alloys and Composites
|
Presentation Title |
Impact of Laser Shock Peening on Stress Corrosion Susceptibility in Al-Mg Alloys |
Author(s) |
Eric Dau, William Golumbfskie, Matthew McMahon |
On-Site Speaker (Planned) |
Eric Dau |
Abstract Scope |
Al-Mg alloys having Mg content greater than 3 wt.% are high performance materials for marine structural applications requiring exposure to aggressive saltwater conditions. The Mg content that affords high strength-to-weight ratio and weldability, however, also enables sensitization in service at temperatures exceeding 40 ᵒC, which causes increased susceptibility to intergranular stress corrosion cracking (IG-SCC). The laser shock peening (LSP) surface treatment is a candidate to reduce this susceptibility by imparting deep compressive residual stresses, however the efficacy of this process in reducing IG-SCC is relatively unknown.
The present work compares the IG-SCC susceptibility of Al-Mg alloys having variations of LSP treatment through accelerated stress corrosion testing in simulated service conditions. Multiple combinations of LSP parameters were utilized to understand if a unique balance of treatment conditions exists to achieve a high level of IG-SCC mitigation. |