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MM: Fachverband Metall- und Materialphysik

MM 18: Poster Session I

MM 18.4: Poster

Montag, 16. März 2020, 18:15–20:00, P4

Phase Transformations in TiAl during Selective Laser Melting (SLM) studied by X-ray Diffraction — •Jan Rosigkeit, Peter Staron, Emad Maawad, and Florian Pyczak — Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Germany

Interest in SLM has dramatically expanded in the last several years, owing to the advantages of additive manufacturing (AM) compared to conventional manufacturing. The possibility to generate complex components just from CAD-data using a layer-by-layer process may reduce production costs, lead times and material consumption. Complex components can be produced without a mold, and structures can be generated that cannot be produced by other techniques. AM attracts strong attention in the area of high performance materials like intermetallic Titanium Aluminide (TiAl) alloys. They represent innovative materials for high-temperature applications in aviation or energy generation, e.g. turbines blades. However, the cyclic heating and cooling during SLM leads to heat treatments of the previous solidified layers changing the phase content and inducing large residual stresses. Therefore, TiAl has so far only been additively manufactured using electron beam melting, which easily facilitates substrate heating to the required temperatures. Nevertheless, SLM of TiAl can also be achieved with sufficient substrate heating. This study focuses on the phase transformations and residual stress build-up as a function of process parameters in order to understand cracking. For this, diffraction measurements with high-energy X-rays were performed in-situ using an SLM chamber developed for use at a synchrotron beamline.