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Fracture mechanisms in the as-built and stress-relieved laser powder bed fusion Ti6Al4V ELI alloy
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics (from 2013).
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics (from 2013).
Cent Univ Technol Free State, Dept Mech & Mechatron Engn, South Africa.
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics (from 2013).ORCID iD: 0000-0002-9441-2502
2019 (English)In: Optics and Laser Technology, ISSN 0030-3992, E-ISSN 1879-2545, Vol. 109, p. 608-615Article in journal (Refereed) Published
Abstract [en]

The influence of a stress-relief treatment on impact and fatigue properties of Ti6Al4V ELI samples manufactured by laser powder bed fusion was analyzed. The heat treatment resulted in removal of residual stresses, coarsening of needles and formation of precipitations between needles. In both, impact and fatigue tests, crack development was correlated to microstructural features. Fracture analysis was carried out by means of optical and electron microscopy to reveal the influence of microstructure on crack development. Ductile fracture was the dominating fracture mode at impact testing. Pore formation and coalescence were the main crack formation mechanisms. The microstructural changes led to a decrease in impact toughness after heat treatment. Presumably, this was a result of the precipitations between needles. Fatigue results showed multiple crack nucleation at the surface in both, as-built and stress-relieved material. The crack propagation rate was slightly higher and the crack was less deflected in the stress-relieved material due to the stress relief and coarsening of the microstructure.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 109, p. 608-615
Keywords [en]
Fracture analysis, Impact and fatigue properties, Laser powder bed fusion, Stress-relief treatment, Ti6A4V ELI, Aluminum alloys, Coarsening, Cracks, Ductile fracture, Fatigue testing, Fracture testing, Heat treatment, Impact testing, Microstructural evolution, Needles, Residual stresses, Stress relief, Titanium alloys, Crack propagation rate, Laser powders, Microstructural changes, Microstructural features, Optical and electron microscopies, Fatigue of materials
National Category
Atom and Molecular Physics and Optics
Research subject
Physics
Identifiers
URN: urn:nbn:se:kau:diva-69444DOI: 10.1016/j.optlastec.2018.08.042ISI: 000446949600074Scopus ID: 2-s2.0-85053287726OAI: oai:DiVA.org:kau-69444DiVA, id: diva2:1252798
Available from: 2018-10-02 Created: 2018-10-02 Last updated: 2019-01-31Bibliographically approved

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Vilardell, Anna M.Fredriksson, GunnelKrakhmalev, Pavel

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