About this Abstract |
Meeting |
2025 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2025)
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Symposium
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2025 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2025)
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Presentation Title |
Microstructure and Mechanical Properties of Bulk EB-PBF Fabricated γ-TiAl: Post-HIP and Heat Treatment Effects |
Author(s) |
Shadman Tahsin Nabil, Kurtis I Watanabe, Francisco Medina |
On-Site Speaker (Planned) |
Shadman Tahsin Nabil |
Abstract Scope |
Gamma Titanium aluminide (γ-TiAl) is widely used in aerospace and defense for its high strength-to-weight ratio and creep resistance. GE implemented γ-TiAl in their GEnx engine turbine, which significantly reduced fuel consumption, noise, and NOx emissions. However, the traditional processing of intermetallics like Ti-Al remains challenging. Additive manufacturing techniques like electron beam powder bed fusion (EB-PBF) can offer an alternative. This study explores the fabrication of bulk TiAl rods using EB-PBF followed by hot isostatic pressing (HIP) and tailored heat treatments. Specimens underwent annealing with controlled cooling, aging, and quenching to refine the microstructure. Mechanical performance was assessed through tensile tests per ASTM E8 at ambient and elevated temperatures. Heat-treated EB-PBF TiAl exhibited markedly improved tensile properties, reduced anisotropy, and improved mechanical performance. These findings demonstrate the viability of combining EB-PBF, HIP, and optimized heat treatments to produce high-performance titanium aluminide for aerospace and defense applications. |
Proceedings Inclusion? |
Planned: Post-meeting proceedings |