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Electron backscatter diffraction characterization of fatigue crack growth in laser metal wire deposited Ti-6Al-4V
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
Department of Physics, Chalmers University of Technology.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science. Department of Engineering Science, University West.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0003-3661-9262
2018 (English)In: Materials Characterization, ISSN 1044-5803, E-ISSN 1873-4189, Vol. 135, 245-256 p.Article in journal (Refereed) Published
Abstract [en]

By additive manufacturing (AM) there is a feasibility of producing near net shape components in basically one step from 3D CAD model to final product. The interest for AM is high and during the past decade a lot of research has been carried out in order to understand the influence from process parameters on the microstructure and furthermore on the mechanical properties. In the present study laser metal wire deposition of Ti-6Al-4V has been studied in detail with regard to its fatigue crack propagation characteristics. Two specimen orientations, parallel and perpendicular to the deposition direction, have been evaluated at room temperature and at 250 °C. No difference in the fatigue crack growth rate could be confirmed for the two specimen orientations. However, in the fractographic study it was observed that the tortuosity varied between certain regions on the fracture surface. The local crack path characteristic could be related to the alpha colony size and/or the crystallographic orientation. Moreover, large areas exhibiting similar crystallographic orientation were observed along the prior beta grain boundaries, which were attributed to the wide alpha colonies frequently observed along the prior beta grain boundaries.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 135, 245-256 p.
National Category
Other Materials Engineering
Research subject
Engineering Materials
Identifiers
URN: urn:nbn:se:ltu:diva-66763DOI: 10.1016/j.matchar.2017.11.041Scopus ID: 2-s2.0-85034988961OAI: oai:DiVA.org:ltu-66763DiVA: diva2:1160351
Note

Validerad;2017;Nivå 2;2017-12-04 (rokbeg)

Available from: 2017-11-27 Created: 2017-11-27 Last updated: 2017-12-14Bibliographically approved

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