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Locally Adapted Microstructures in an Additively Manufactured Titanium Aluminide Alloy Through Process Parameter Variation and Heat Treatment
Institute of Materials Science (IfWW), Technische Universität Dresden, 01069 Dresden, Germany; Technology Field Additive Manufacturing and Surface Technologies, Fraunhofer Institute for Material and Beam Technology IWS, 01277 Dresden, Germany.ORCID-id: 0000-0002-3304-4283
Chair of Materials Test Engineering (WPT), TU Dortmund University, 44227 Dortmund, Germany.ORCID-id: 0000-0002-9960-735X
Institute of Materials Science (IfWW), Technische Universität Dresden, 01069 Dresden, Germany; Technology Field Additive Manufacturing and Surface Technologies, Fraunhofer Institute for Material and Beam Technology IWS, 01277 Dresden, Germanyterial and Beam Technology IWS, 01277 Dresden, Germany.ORCID-id: 0000-0001-8126-8532
Technology Field Additive Manufacturing and Surface Technologies, Fraunhofer Institute for Material and Beam Technology IWS, 01277 Dresden, Germany.ORCID-id: 0000-0003-1716-2156
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2023 (Engelska)Ingår i: Advanced Engineering Materials, ISSN 1438-1656, E-ISSN 1527-2648, Vol. 25, nr 2, artikel-id 2200917Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Electron beam powder bed fusion (PBF-EB/M) has been attracting great research interest as a promising technology for additive manufacturing of titanium aluminide alloys. However, challenges often arise from the process-induced evaporation of aluminum, which is linked to the PBF-EB/M process parameters. This study applies different volumetric energy densities during PBF-EB/M processing to deliberately adjust the aluminum contents in additively manufactured Ti–43.5Al–4Nb–1Mo–0.1B (TNM-B1) samples. The specimens are subsequently subjected to hot isostatic pressing (HIP) and a two-step heat treatment. The influence of process parameter variation and heat treatments on microstructure and defect distribution are investigated using optical and scanning electron microscopy, as well as X-ray computed tomography (CT). Depending on the aluminum content, shifts in the phase transition temperatures can be identified via differential scanning calorimetry (DSC). It is confirmed that the microstructure after heat treatment is strongly linked to the PBF-EB/M parameters and the associated aluminum evaporation. The feasibility of producing locally adapted microstructures within one component through process parameter variation and subsequent heat treatment can be demonstrated. Thus, fully lamellar and nearly lamellar microstructures in two adjacent component areas can be adjusted, respectively.

Ort, förlag, år, upplaga, sidor
John Wiley & Sons, 2023. Vol. 25, nr 2, artikel-id 2200917
Nyckelord [en]
additive manufacturing, electron beam powder bed fusion, locally adaptedmicrostructures, microstructure characterization, titanium aluminides, two-step heat treatments
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Fysikalisk kemi Bearbetnings-, yt- och fogningsteknik
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Identifikatorer
URN: urn:nbn:se:ltu:diva-93400DOI: 10.1002/adem.202200917ISI: 000866379700001Scopus ID: 2-s2.0-85139668988OAI: oai:DiVA.org:ltu-93400DiVA, id: diva2:1700592
Anmärkning

Validerad;2023;Nivå 2;2023-04-19 (hanlid);

Funder: German Research Foundation (Deutsche Forschungsgemein-schaft, DFG), (404665753, 406109547)

Tillgänglig från: 2022-10-03 Skapad: 2022-10-03 Senast uppdaterad: 2023-04-19Bibliografiskt granskad

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