About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Beyond the Beam III
|
| Presentation Title |
Effect of Powder Heat Treatment on Fatigue Performance of Free Standing AA7075 Cold Spray |
| Author(s) |
Christopher Jacob Williamson, Arthur Webb, James Brian Jordon, Luke Brewer |
| On-Site Speaker (Planned) |
Christopher Jacob Williamson |
| Abstract Scope |
In this study, the effect of powder heat treatment on the fatigue performance of freestanding cold sprayed AA7075 was investigated. In particular, depositions of as-atomized, overaged, and solutionized powders were tested in stress controlled fatigue with the solutionized powder exhibiting an increased life across all stress levels as well as exhibiting a higher runout stress, while the two other powder treatments exhibited nearly identical fatigue properties. Post-testing fractography revealed a change in fracture mechanism in all three depositions, where the short crack growth regime was dominated by transparticle crack growth but as the stress intensity increased the crack began preferentially fracturing around prior particle boundaries. The influence of surface intermetallics present on the as-atomized and overaged powder correlated with smaller regions of transparticle growth and earlier crack initiation to shorten the fatigue life compared to the solutionized deposition. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Powder Materials, Mechanical Properties, Additive Manufacturing |