About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
Presentation Title |
Advancing the Understanding of the Impact of Atmospheric Environments on Corrosion Fatigue Crack Growth Rates of AA7085-T7451 |
Author(s) |
Jenifer S. Locke, Brandon Free, Mary Cefaratti, Sarah G Dorman |
On-Site Speaker (Planned) |
Jenifer S. Locke |
Abstract Scope |
This work aims to understand if conventional laboratory environment assisted cracking test environments of full immersion in aqueous solutions and lab air can properly estimate corrosion fatigue (CF) performance in atmospheric environments. To do this, constant ΔK, constant R, and varied fatigue loading frequency testing was performed on AA7085-T7451 with NaCl particles printed on the sample surface all while controlling RH and T levels to mimic aerospace environments. Testing measuring crack growth rate (da/dN) shows that for salt deposition levels between 50 and 300 μ/cm2, da/dN are similar to that measured in 0.06M NaCl. Interestingly, da/dN in the atmospheric environment is higher than that measured under full immersion in a solution of identical chemistry. Testing is ongoing between -40 and 25C to investigate the effect of T. |
Proceedings Inclusion? |
Planned: |
Keywords |
Aluminum, Mechanical Properties, Environmental Effects |