About this Abstract |
Meeting |
2024 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2024)
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Symposium
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2024 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2024)
|
Presentation Title |
Microstructural and Mechanical Heterogeneity Observed in Additive Friction Stir Deposition Ti-6Al-4V |
Author(s) |
Eric M. Heikkenen, Rob Patterson, Joshua Kincaid, Peter Metz, Suresh Babu, Tony Schmitz |
On-Site Speaker (Planned) |
Eric M. Heikkenen |
Abstract Scope |
Additive friction stir deposition (AFSD) was used to deposit Ti-6Al-4V both above and below the beta transus temperature. The stir zone region microstructures varied from equiaxed alpha to bimodal to lamellar in the stir zone. Below the final stirred regions, micrographs revealed microstructural heterogeneity in the form of etching bands, while hardness maps correlated the observed differences to mechanical heterogeneity. This heterogeneity was seen to vary periodically both on a single layer-scale as well as a longer-range, multi-layer scale. These variations correspond to process stoppages related to material reload events inherent to a discrete feed system. These findings suggest that thermal gradients should be a consideration for AFSD of titanium, even with a continuous feed system. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |