This title appears in the Scientific Report :
2017
Please use the identifier:
http://hdl.handle.net/2128/16319 in citations.
Please use the identifier: http://dx.doi.org/10.1016/j.nme.2016.10.025 in citations.
Self-castellation of tungsten monoblock under high heat flux loading and impact of material properties
Self-castellation of tungsten monoblock under high heat flux loading and impact of material properties
In the full-tungsten divertor qualification program at ITER Organization, macro-cracks, so called self-castellation were found in a fraction of tungsten monoblocks during cyclic high heat flux loading at 20MW/m2. The number of monoblocks with macro-cracks varied with the tungsten products used as ar...
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Personal Name(s): | Panayotis, S. (Corresponding author) |
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Hirai, T. / Barabash, V. / Durocher, A. / Escourbiac, F. / Linke, J. / Loewenhoff, Th. / Merola, M. / Pintsuk, G. / Uytdenhouwen, I. / Wirtz, Marius | |
Contributing Institute: |
Plasmaphysik; IEK-4 Werkstoffstruktur und -eigenschaften; IEK-2 |
Published in: | Nuclear materials and energy, 12 (2017) S. 200-204 |
Imprint: |
Amsterdam [u.a.]
Elsevier
2017
|
DOI: |
10.1016/j.nme.2016.10.025 |
Document Type: |
Journal Article |
Research Program: |
Plasma-Wall-Interaction |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1016/j.nme.2016.10.025 in citations.
In the full-tungsten divertor qualification program at ITER Organization, macro-cracks, so called self-castellation were found in a fraction of tungsten monoblocks during cyclic high heat flux loading at 20MW/m2. The number of monoblocks with macro-cracks varied with the tungsten products used as armour material. In order to understand correlation between the macro-crack appearance and W properties, an activity to characterize W monoblock materials was launched at the IO. The outcome highlighted that the higher the recrystallization resistance, the lower the number of cracks detected during high heat flux tests. Thermo-mechanical finite element modelling demonstrated that the maximum surface temperature ranges from 1800 °C to 2200 °C and in this range recrystallization of tungsten occurred. Furthermore, it indicated that loss of strength due to recrystallization is responsible for the development of macro-cracks in the tungsten monoblock. |