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Hydrogen-induced phase transformation and microstructure evolution for Ti-6Al-4V parts produced by electron beam melting
School of Nuclear Physics, National Research Tomsk Polytechnic University, Russia.
School of Nuclear Physics, National Research Tomsk Polytechnic University, Russia; Institute of Strength Physics and Materials Science of Siberian Branch of Russian Academy of Sciences, Tomsk, Russia.
School of Nuclear Physics, National Research Tomsk Polytechnic University, Russia.
School of Nuclear Physics, National Research Tomsk Polytechnic University, Russia.
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2018 (English)In: Metals, ISSN 2075-4701, Vol. 8, no 5, article id 301Article in journal (Refereed) Published
Abstract [en]

In this paper, phase transitions and microstructure evolution in titanium Ti-6Al-4V alloy parts produced by electron beam melting (EBM) under hydrogenation was investigated. Hydrogenation was carried out at the temperature of 650 °C to the absolute hydrogen concentrations in the samples of 0.29, 0.58, and 0.90 wt. %. Comparative analysis of microstructure changes in Ti-6Al-4V alloy parts was performed using scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD). Furthermore, in-situ XRD was used to investigate the phase transitions in the samples during hydrogenation. The structure of Ti-6Al-4V parts produced by EBM is represented by the α phase plates with the transverse length of 0.2 µm, the β phase both in the form of plates and globular grains, and metastable α'' and ω phases. Hydrogenation to the concentration of 0.29 wt. % leads to the formation of intermetallic Ti3Al phase. The dimensions of intermetallic Ti3Al plates and their volume fraction increase significantly with hydrogen concentration up to 0.58 wt. % along with precipitation of nano-sized crystals of titanium δ hydrides. Individual Ti3Al plates decay into nanocrystals with increasing hydrogen concentration up to 0.9 wt. % accompanied by the increase of proportion and size of hydride plates. Hardness of EBM Ti-6Al-4V alloy decreases with hydrogen content. 

Place, publisher, year, edition, pages
2018. Vol. 8, no 5, article id 301
Keywords [en]
Additive manufacturing, Electron beam melting, Hydrogen, Microstructure, Phase transitions, Titanium Ti-6Al-4V alloy
National Category
Other Mechanical Engineering
Identifiers
URN: urn:nbn:se:miun:diva-33739DOI: 10.3390/met8050301ISI: 000435109300011Scopus ID: 2-s2.0-85046696127OAI: oai:DiVA.org:miun-33739DiVA, id: diva2:1215940
Available from: 2018-06-10 Created: 2018-06-10 Last updated: 2019-08-06Bibliographically approved

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Koptioug, Andrei

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