About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
| Presentation Title |
Effect of Crack-initiating Feature on the Environment-assisted Cracking Behavior of Sensitized AA5456-H116 in Marine Environments |
| Author(s) |
Zachary D. Harris, Lara Ojha, Jayendran Srinivasan, Robert G Kelly, James T. Burns |
| On-Site Speaker (Planned) |
Zachary D. Harris |
| Abstract Scope |
The influence of crack-initiating feature on the environment-assisted cracking (EAC) behavior of sensitized AA5456-H116 exposed to marine environments is assessed via fracture mechanics-based testing. Specimens that contained either a traditional fatigue precrack or purposefully introduced intergranular corrosion fissures were immersed in 0.6 M NaCl and polarized to select electrochemical potentials while held at a constant force. The measured crack length versus time relationships from these experiments reveal that the both geometries yield similar crack growth rates at -900 mVSCE and after the onset of accelerated crack propagation at -800 mVSCE. However, precorroded specimens exhibit shorter times to failure than the precracked specimens at -800 mVSCE due to initially increased crack growth rates. Factors responsible for the initially increased susceptibility of the precorroded specimens are identified using a generalized EAC model. The implications of these results on the efficacy of fracture mechanics-based methods for quantifying EAC are then discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Environmental Effects, Mechanical Properties, |