About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing Fatigue and Fracture: Effects of Surface Roughness, Residual Stress, and Environment
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Presentation Title |
Tunable Fatigue Performance in Laser Powder Bed Fusion Titanium Alloy via Laser Shock Peening |
Author(s) |
Nik Hrabe, Tom Berfield, Jake Benzing, Newell Moser, Orion Kafka, Nicholas Derimow |
On-Site Speaker (Planned) |
Nik Hrabe |
Abstract Scope |
Laser shock peening (LSP) shows potential to improve fatigue performance of additive manufacturing metals through controlled manipulation of residual stress with little effect on surface roughness or microstructure. In this work, LSP was used to manipulate the residual stress profile of titanium alloy (Ti-6Al-4V) specimens manufactured via laser powder bed fusion (PBF-L). Vertically oriented, cylindrical specimens were built in a single build using standard melt parameters and powder. Specimens were tested without machining in axial stress-controlled high-cycle fatigue (R= 0.1, ASTM E466) in four material conditions: as-built (no surface treatment or heat treatment), stress relieved (600 °C, 3 hours, vacuum, furnace cool), and two laser shock peening parameter sets (varying number of passes). Residual stress (contour method), porosity (XCT), surface roughness (profilometry and XCT), fractography (SEM), and microstructure (EBSD) evaluations were performed within specimen gauge sections for all four conditions. |
Proceedings Inclusion? |
Planned: |
Keywords |
Titanium, |