About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
Presentation Title |
Comparison of Surface Treatment Technologies for the Mitigation of Stress Corrosion Cracking in Al-Mg |
Author(s) |
Matthew McMahon, William Golumbfskie, Eric Dau |
On-Site Speaker (Planned) |
Matthew McMahon |
Abstract Scope |
Al-Mg alloys such as AA5083 and AA5456 are of increasing interest for marine construction based on their weldability and high strength-to-weight ratio. However, Mg diffusion to the grain boundaries to form the β phase (Al3Mg2) remains a concern, since this sensitization process enables stress corrosion cracking (SCC) and promotes premature failure in service. One means of combating this phenomenon is compressive surface treatment, which imparts cold work and compressive residual stress into the material to reduce the effective stress experienced at a surface flaw, if it were to form. The present work evaluates two surface treatment technologies, ultrasonic impact treatment (UIT) and laser shock peening (LSP), for their ability to mitigate SCC in marine conditions. These treatments are evaluated by way of the slow rising stress intensity test in simulated seawater to determine the efficacy of each in near worst-case crack growth scenarios. |
Proceedings Inclusion? |
Planned: |
Keywords |
Aluminum, Environmental Effects, Surface Modification and Coatings |