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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, S. Ganguly, S. Williams

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

Swansea University Author: Nicholas Lavery

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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
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa50198
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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 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.
Keywords: WAAM, Tungsten, Microstructure, Thermal properties, Nuclear fusion, Thermal conductivity
Start Page: 45
End Page: 53