In Situ CT Tensile Testing of an Additively Manufactured and Heat-Treated Metastable ß-Titanium Alloy (Ti-5Al-5Mo-5V-3Cr)Show others and affiliations
2021 (English)In: Applied Sciences, E-ISSN 2076-3417, Vol. 11, no 21, article id 9875Article in journal (Refereed) Published
Abstract [en]
Additive manufacturing has been considered a suitable process for developing high-performance parts of medical or aerospace industries. The electron beam powder bed fusion process, EB-PBF, is a powder bed fusion process carried out in a vacuum, in which the parts are melted using a highly focused electron beam. The material class of metastable β-titanium alloys, and especially Ti-5Al-5Mo-5V-3Cr, show great potential for use as small and highly complex load-bearing parts. Specimens were additively manufactured with optimised process parameters and different heat treatments used in order to create tailored mechanical properties. These heat-treated specimens were analysed with regard to their microstructure (SEM) and their mechanical strength (tensile testing). Furthermore, in situ tensile tests, using a Deben CT5000 and a YXLON ff35 industrial µ-CT, were performed and failure-critical defects were detected, analysed and monitored. Experimental results indicate that, if EB-PBF-manufactured Ti-5553 is heat-treated differently, a variety of mechanical properties are possible. Regarding their fracture mechanisms, failure-critical defects can be detected at different stages of the tensile test and defect growth behaviour can be analysed.
Place, publisher, year, edition, pages
MDPI, 2021. Vol. 11, no 21, article id 9875
Keywords [en]
additive manufacturing, electron beam powder bed fusion, titanium alloy, process– structure–property relationship, industrial computer tomography, non-destructive-evaluation, in situ tensile testing, materials characterisation
National Category
Metallurgy and Metallic Materials
Research subject
Manufacturing Systems Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-87715DOI: 10.3390/app11219875ISI: 000778164200005Scopus ID: 2-s2.0-85117561688OAI: oai:DiVA.org:ltu-87715DiVA, id: diva2:1607521
Note
Validerad;2021;Nivå 2;2021-11-01 (beamah);
Funder: Bundesministerium für Bildung und Forschung (03ZZ0212G)
2021-11-012021-11-012022-04-21Bibliographically approved