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Fatigue crack growth of electron beam melted TI-6AL-4V in high-pressure hydrogen
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. Luleå University of Technology, Division of Materials Science, Luleå, 97181, Sweden;Chalmers University of Technology, . (PTW)ORCID iD: 0000-0003-3772-4371
Chalmers University of Technology,Department of Applied Physics, Göteborg, 41296, Sweden.
GKN Aerospace Engine Systems, Trollhättan, 46138, Sweden.
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. GKN Aerospace Engine Systems, Trollhättan, 46138, Sweden.
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2020 (English)In: Materials, ISSN 1996-1944, E-ISSN 1996-1944, Vol. 13, no 6, article id 1287Article in journal (Refereed) Published
Abstract [en]

Titanium-based alloys are susceptible to hydrogen embrittlement (HE), a phenomenon that deteriorates fatigue properties. Ti-6Al-4V is the most widely used titanium alloy and the effect of hydrogen embrittlement on fatigue crack growth (FCG) was investigated by carrying out crack propagation tests in air and high-pressure H2 environment. The FCG test in hydrogen environment resulted in a drastic increase in crack growth rate at a certain DK, with crack propagation rates up to 13 times higher than those observed in air. Possible reasons for such behavior were discussed in this paper. The relationship between FCG results in high-pressure H2 environment and microstructure was investigated by comparison with already published results of cast and forged Ti-6Al-4V. Coarser microstructure was found to be more sensitive to HE. Moreover, the electron beam melting (EBM) materials experienced a crack growth acceleration in-between that of cast and wrought Ti-6Al-4V. © 2020 by the authors.

Place, publisher, year, edition, pages
2020. Vol. 13, no 6, article id 1287
Keywords [en]
3D printers; Aluminum alloys; Cracks; Electron beam melting; Electron beams; Fatigue crack propagation; Growth rate; High pressure effects; Hydrogen; Hydrogen embrittlement; Microstructure; Ternary alloys; Titanium alloys, Cast and wrought; Crack propagation rate; Crack propagation tests; Fatigue properties; High pressure; High pressure hydrogen; Ti-6 Al-4 V; Titanium-based alloys, Fatigue of materials
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Other Materials Engineering
Identifiers
URN: urn:nbn:se:hv:diva-15107DOI: 10.3390/ma13061287ISI: 000529208000026Scopus ID: 2-s2.0-85082593205OAI: oai:DiVA.org:hv-15107DiVA, id: diva2:1424260
Note

Funders: Space for innovation and growth (RIT)

Available from: 2020-04-16 Created: 2020-04-16 Last updated: 2020-09-09

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Neikter, MagnusHansson, ThomasPederson, Robert

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