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)
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Presentation Title |
Laser Speckle Photometry for Residual Stress Diagnosis of Laser Powder Bed Fusion Processing |
Author(s) |
Justin Krantz, Gonzalo Reyes-Donoso, Robert Landers, Cody Lough, Ben Brown, Edward C. Kinzel |
On-Site Speaker (Planned) |
Justin Krantz |
Abstract Scope |
A major challenge in Laser Powder Bed Fusion (LPBF) process development is the presence of residual stresses in the as-built material. Detection and reduction of these residual stresses would improve the quality of LPBF parts. Laser speckle photometry involves illumination of the build area with a visible laser, creating a speckle pattern. Residual stress driven deformation in the material can be observed at resolutions below the diffraction limit by observing changes in the laser speckle pattern. A femtosecond laser ablates the material to release residual stress. The resulting strain can then be observed. This allows for the measurement of residual stresses in-situ while simultaneously providing the ability to release these stresses to improve material properties. The Department of Energy’s Kansas City National Security Campus (operated and managed by Honeywell Federal Manufacturing Technologies, LLC under contract number DE-NA0002839) funded this work. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |