In-situ aluminum control for titanium aluminide via electron beam powder bed fusion to realize a dual microstructure

Knoerlein J, Franke MM, Schloffer M, Körner C (2022)

Publication Type: Journal article

Publication year: 2022

Journal

Additive Manufacturing Elsevier

Book Volume: 59

DOI: 10.1016/j.addma.2022.103132

Abstract

With electron beam powder bed fusion (PBF-EB), an additive manufacturing (AM) technique, complex-shaped components with excellent properties from high-temperature materials can be manufactured. The latest research on the PBF-EB technique reveals the possibility of establishing different microstructures and differing mechanical properties inside a component made of titanium aluminides (TiAl). In detail, two different well-adjusted process parameter sets lead to varying melt pool characteristics and a significant change in localized aluminum (Al) loss during melting. After heat treatment, the as-built microstructure containing two different levels of Al is transformed into differing customized microstructure and properties. Areas with high Al concentration will be transformed into a nearly lamellar microstructure (NL+gamma) with enhanced strength. In contrast, areas with lowered Al concentration will be changed into a fully lamellar microstructure (FL) that displays an increased creep resistance. The presented dual microstructure concept, based on the functionally graded material (FGM) concept, is a groundbreaking benefit from the PBF-EB process necessary to overcome prevailing design limitations. For the first time, components such as TiAl turbine blades can consist of creep-resistant airfoil sections and high strength root sections taking advantage of new design possibilities and additional weight savings at robust dual microstructure designs.

Authors with CRIS profile

Carolin Körner Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle)

Involved external institutions

MTU Aero Engines AG DE Germany (DE) Neue Materialien Fürth GmbH DE Germany (DE)

How to cite

APA:

Knoerlein, J., Franke, M.M., Schloffer, M., & Körner, C. (2022). In-situ aluminum control for titanium aluminide via electron beam powder bed fusion to realize a dual microstructure. Additive Manufacturing, 59. https://doi.org/10.1016/j.addma.2022.103132

MLA:

Knoerlein, Julia, et al. "In-situ aluminum control for titanium aluminide via electron beam powder bed fusion to realize a dual microstructure." Additive Manufacturing 59 (2022).

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