About this Abstract |
| Meeting |
2026 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2026)
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| Symposium
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2026 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2026)
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| Presentation Title |
In-Situ Characterization of Residual Stresses in Powder-Based Directed Energy Deposition |
| Author(s) |
Andrea N. Camacho-Betancourt, Tor Slowe, Iris V. Rivero |
| On-Site Speaker (Planned) |
Andrea N. Camacho-Betancourt |
| Abstract Scope |
This research investigates the feasibility of the ψ˛ X-ray diffraction (XRD) method for in-situ, non-destructive residual stress analysis during powder-based directed energy deposition (DED) of 316 stainless steel powder onto a matching substrate. Where conventional techniques, like the contour method, require mechanical post-processing, in-situ XRD enables real-time tracking of lattice strain. Using lateral tilts, the ψ˛ method obtains measurements without reorienting the sample immediately following deposition. Single-layer depositions were examined to isolate the effects of localized thermal cycles during deposition and subsequently compared to measurements post-cooling after residual stresses profiles stabilized. Residual stresses measurements using the ψ˛ XRD method enables tracking of the lattice strain evolution, showing thermal cycling and high tensile residual stress in the melt pool region. Ultimately, real-time tracking can provide predictive insight into final the state of residual stresses on the DED fabricated components enabling process parameter optimization for remanufacturing applications. |
| Proceedings Inclusion? |
Undecided |