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Meeting 2026 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2026)
Symposium 2026 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2026)
Presentation Title Effect of Oxygen Contamination in Shielding Environment on Laser Metal Deposited Ti-5Al-5Mo-5V-3Cr alloy
Author(s) Ranjit Joy, Sung-Heng Wu, Frank Liou
On-Site Speaker (Planned) Ranjit Joy
Abstract Scope Laser Metal Deposition (LMD) can promote oxygen pickup from the shielding environment, causing variation in tensile behavior of β Ti-5553 deposits. Ti-5553 powder was deposited in an enclosed volume having different oxygen concentrations and by conventional Localized Shielding Gas (LSG) strategy. The critical oxygen concentration that causes ductile-to-brittle transition was systematically investigated using tensile testing. Oxygen pickup in LMD processed thin walls increased with increasing oxygen concentration. Tensile testing revealed only incremental increase in yield, and ultimate tensile strengths with corresponding increase in oxygen pickup, primarily due to solid solution strengthening. However, the post-yield ductility was significantly influenced by oxygen pickup. Gradual reduction in total elongation was registered from 1 PPM to 1000 PPM while exhibiting significant ductility, which was followed by a transition to mixed mode at an oxygen concentration of 5000 PPM. Interestingly, LSG processing induced a fully brittle failure, attributed to increased α precipitation at grain boundaries.
Proceedings Inclusion? Planned: Post-meeting proceedings

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