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

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.

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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://dx.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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