|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||GAT-2017 (Gamma Alloys Technology - 2017)
||Fatigue Thresholds in γ-TiAl Alloys Produced by Additive Manufacturing
||Mauro Filippini, Stefano Beretta, Luca Patriarca
|On-Site Speaker (Planned)
Additive manufacturing (AM) based on (selective) Electron Beam Melting (EBM) is considered to be a viable technology to effectively produce γ-TiAl alloys with mechanical properties suitable for the application to structural components. As in the case of other technologies (e.g. casting, forging), once material is obtained, different microstructures can be achieved for the same alloy composition by adjusting the heat treatment parameters. In this work, an overview of the fatigue properties of three different variants of gamma-TiAl intermetallics produced by additive manufacturing by selective Electron Beam Melting (EBM) is presented. Results of fatigue tests on a Ti-48Al-2Cr-2Nb alloy, on a high Nb containing and a Mo-containing alloys, each with distinctive microstructures, are compared. Fatigue crack growth experiments conducted in the threshold region reveal how the local microstructure influences the evolution of fatigue damage. The analysis presented here is aimed at providing information useful for designing against fatigue with γ-TiAl intermetallics.
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