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Microstructure stability of beta-solidifying TiAl alloys produced by selective laser melting

Gussone, Joachim and Stark, Andreas and Schell, Norbert and Requena, Guillermo and Haubrich, Jan (2019) Microstructure stability of beta-solidifying TiAl alloys produced by selective laser melting. EUROMAT 2019, 02.-06. Sept. 2019, Stockholm, Schweden.

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γ-TiAl alloys are well-suited for aerospace applications due to low density, high temperature strength and Young’s modulus as well as high corrosion and oxidation resistance [1]. Since current products are restricted by conventional processing routes, new opportunities arise from the prospect of processing γ-TiAl by selective laser melting (SLM). The development of suitable SLM processing conditions for γ-TiAl alloys would allow the realisation of more complex geometries, such as parts with varying cooling channels. However, SLM of γ-TiAl is demanding: cracking due to residual stresses from high cooling rates and Al evaporation during manufacturing. Increasing the substrate plate temperature followed by slow cooling after the process [2, 3] reduces temperature gradients and, thus, thermal stresses. In this work we employed in situ high-temperature heating (between 400-800 °C) to manufacture beta-solidifying TiAl alloys by SLM and compared the effects of intrinsic heat-treatment during SLM with extrinsic post-annealing. Evolution of the microstructure during heat-treatment of as-built samples studied by in situ synchrotron radiation diffraction shows various phase transformations below the eutectoid temperature as a consequence of microstructural stabilization. The intrinsic heat-treatment during SLM leads to graded microstructures characterized by an augmentation of  phase with increasing building time [4]. [1] H. Clemens, et al., Design of Novel ß-solidifying TiAl Alloys with Adjustable ß/B2-phase Fraction and Excellent Hot-Workability, Advanced Engineering Materials, 10, 707-713 (2008). [2] J. Gussone, et al., Microstructure of γ-titanium aluminide processed by selective laser melting at elevated temperatures, Intermetallics, 66, 133-140 (2015). [3] W. Li, et al., Effect of substrate preheating on the texture, phase and nanohardness of a Ti–45Al–2Cr–5Nb alloy processed by selective laser melting”, Scripta Materialia, 118, 13-18 (2016). [4] Gussone, J. et al., Microstructure stability of γ-TiAl produced by selective laser melting. Scripta Materialia, 130, 110-113 (2017).

Item URL in elib:https://elib.dlr.de/130463/
Document Type:Conference or Workshop Item (Poster)
Title:Microstructure stability of beta-solidifying TiAl alloys produced by selective laser melting
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Gussone, JoachimJoachim.Gussone (at) dlr.deUNSPECIFIED
Stark, AndreasHZG, GeesthachtUNSPECIFIED
Schell, NorbertHZG, GeesthachtUNSPECIFIED
Requena, GuillermoGuillermo.Requena (at) dlr.deUNSPECIFIED
Haubrich, JanJan.Haubrich (at) dlr.deUNSPECIFIED
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Event Title:EUROMAT 2019
Event Location:Stockholm, Schweden
Event Type:international Conference
Event Dates:02.-06. Sept. 2019
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures and Materials
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Metallic Structures and Hybrid Material Systems
Deposited By: Haubrich, Jan
Deposited On:14 Nov 2019 17:29
Last Modified:14 Nov 2019 17:29

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