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Microstructure and thermal properties of unalloyed tungsten deposited by wire + Arc Additive Manufacturing

G. Marinelli, F. Martina, H. Lewtas, D. Hancock, S. Mehraban, Nicholas Lavery Orcid Logo, S. Ganguly, S. Williams

Journal of Nuclear Materials, Volume: 522, Pages: 45 - 53

Swansea University Author: Nicholas Lavery Orcid Logo

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Abstract

Tungsten is considered as one of the most promising materials for nuclear fusion reactor chamber applications. Wire + Arc Additive Manufacturing has already demonstrated the ability to deposit defect-free large-scale tungsten structures, with considerable deposition rates. In this study, the microst...

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Published in: Journal of Nuclear Materials
ISSN: 0022-3115
Published: 2019
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URI: https://cronfa.swan.ac.uk/Record/cronfa50198
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first_indexed 2019-05-09T20:01:10Z
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spelling 2021-01-29T10:52:31.4224025 v2 50198 2019-05-02 Microstructure and thermal properties of unalloyed tungsten deposited by wire + Arc Additive Manufacturing 9f102ff59824fd4f7ce3d40144304395 0000-0003-0953-5936 Nicholas Lavery Nicholas Lavery true false 2019-05-02 MECH Tungsten is considered as one of the most promising materials for nuclear fusion reactor chamber applications. Wire + Arc Additive Manufacturing has already demonstrated the ability to deposit defect-free large-scale tungsten structures, with considerable deposition rates. In this study, the microstructure of the as-deposited and heat-treated material has been characterised; it featured mainly large elongated grains for both conditions. The heat treatment at 1273 K for 6 h had a negligible effect on microstructure and on thermal diffusivity. Furthermore, the linear coefficient of thermal expansion was in the range of 4.5 × 10−6 μm m−1 K−1 to 6.8 × 10−6 μm m−1 K−1; the density of the deposit was as high as 99.4% of the theoretical tungsten density; the thermal diffusivity and the thermal conductivity were measured and calculated, respectively, and seen to decrease considerably in the temperature range between 300 K and 1300 K, for both testing conditions. These results showed that Wire + Arc Additive Manufacturing can be considered as a suitable technology for the production of tungsten components for the nuclear sector. Journal Article Journal of Nuclear Materials 522 45 53 0022-3115 WAAM, Tungsten, Microstructure, Thermal properties, Nuclear fusion, Thermal conductivity 31 12 2019 2019-12-31 10.1016/j.jnucmat.2019.04.049 COLLEGE NANME Mechanical Engineering COLLEGE CODE MECH Swansea University 2021-01-29T10:52:31.4224025 2019-05-02T09:12:14.8824563 G. Marinelli 1 F. Martina 2 H. Lewtas 3 D. Hancock 4 S. Mehraban 5 Nicholas Lavery 0000-0003-0953-5936 6 S. Ganguly 7 S. Williams 8 0050198-02052019091444.pdf marinelli2019.pdf 2019-05-02T09:14:44.0870000 Output 10828936 application/pdf Accepted Manuscript true 2020-05-01T00:00:00.0000000 Released with a Creative Commons Attribution Non-Commercial No Derivatives License (CC-BY-NC-ND) true eng
title Microstructure and thermal properties of unalloyed tungsten deposited by wire + Arc Additive Manufacturing
spellingShingle Microstructure and thermal properties of unalloyed tungsten deposited by wire + Arc Additive Manufacturing
Nicholas Lavery
title_short Microstructure and thermal properties of unalloyed tungsten deposited by wire + Arc Additive Manufacturing
title_full Microstructure and thermal properties of unalloyed tungsten deposited by wire + Arc Additive Manufacturing
title_fullStr Microstructure and thermal properties of unalloyed tungsten deposited by wire + Arc Additive Manufacturing
title_full_unstemmed Microstructure and thermal properties of unalloyed tungsten deposited by wire + Arc Additive Manufacturing
title_sort Microstructure and thermal properties of unalloyed tungsten deposited by wire + Arc Additive Manufacturing
author_id_str_mv 9f102ff59824fd4f7ce3d40144304395
author_id_fullname_str_mv 9f102ff59824fd4f7ce3d40144304395_***_Nicholas Lavery
author Nicholas Lavery
author2 G. Marinelli
F. Martina
H. Lewtas
D. Hancock
S. Mehraban
Nicholas Lavery
S. Ganguly
S. Williams
format Journal article
container_title Journal of Nuclear Materials
container_volume 522
container_start_page 45
publishDate 2019
institution Swansea University
issn 0022-3115
doi_str_mv 10.1016/j.jnucmat.2019.04.049
document_store_str 1
active_str 0
description Tungsten is considered as one of the most promising materials for nuclear fusion reactor chamber applications. Wire + Arc Additive Manufacturing has already demonstrated the ability to deposit defect-free large-scale tungsten structures, with considerable deposition rates. In this study, the microstructure of the as-deposited and heat-treated material has been characterised; it featured mainly large elongated grains for both conditions. The heat treatment at 1273 K for 6 h had a negligible effect on microstructure and on thermal diffusivity. Furthermore, the linear coefficient of thermal expansion was in the range of 4.5 × 10−6 μm m−1 K−1 to 6.8 × 10−6 μm m−1 K−1; the density of the deposit was as high as 99.4% of the theoretical tungsten density; the thermal diffusivity and the thermal conductivity were measured and calculated, respectively, and seen to decrease considerably in the temperature range between 300 K and 1300 K, for both testing conditions. These results showed that Wire + Arc Additive Manufacturing can be considered as a suitable technology for the production of tungsten components for the nuclear sector.
published_date 2019-12-31T04:03:32Z
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