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Martensitic transformations in Ti-6Al-4V (ELI) alloy manufactured by 3D Printing
Institute of Metal Physics, Russia; Ural Federal University, Russia.
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics (from 2013).ORCID iD: 0000-0002-9441-2502
Chalmers University of Technology, Sweden.
Central University of Technology, South Africa.
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2018 (English)In: Materials Characterization, ISSN 1044-5803, E-ISSN 1873-4189, Vol. 146, p. 101-112Article in journal (Refereed) Published
Abstract [en]

In the present investigation, Ti-6Al-4V ELI samples were manufactured by the powder-bed fusion (PBF) process using the laser sintering (LS) technology. Microstructure, chemical and phase constitution, and mechanical properties were studied by means of the transmission electron microscopy, atom probe tomography, X-ray diffraction, nanoindentation and mechanical testing. It was found that the structure of LS samples consisted of two different variants of metastable phases, namely the hexagonal alpha' martensitic phase and small amounts of the orthorhombic alpha '' martensitic phase. The martensitic alpha'-phase was formed because of the high cooling rates of the LS method, The {10 (1) over bar2} <(1) over bar 011 > hexagonal martensite tensile twins were observed in the microstructure of the as-build alloy. Small areas with inner twinning martensitic plates, which are typical for the metastable orthor-hombic martensitic phase in titanium alloys, were identified by the transmission electron microscopy. Atom probe tomography (APT) confirmed localization of beta-stabilizing elements at interfaces, presumably at the twin or lamella boundaries. The structure and origin of the martensitic phases in 3D printed Ti-6Al-4V alloys are discussed with respect to in-situ heat treatment during manufacturing.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 146, p. 101-112
Keywords [en]
Material or constituting phase(s) Titanium alloys Laser sintering Metastable phases Mechanical properties
National Category
Materials Engineering
Research subject
Materials Engineering
Identifiers
URN: urn:nbn:se:kau:diva-70951DOI: 10.1016/j.matchar.2018.09.042ISI: 000452816700010OAI: oai:DiVA.org:kau-70951DiVA, id: diva2:1286657
Available from: 2019-02-07 Created: 2019-02-07 Last updated: 2019-02-13Bibliographically approved

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Krakhmalev, Pavel

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