Self-castellation of tungsten monoblock under high heat flux loading and impact of material properties

Panayotis, S.; Uytdenhouwen, I.; Barabash, V.; Linke, J.; Escourbiac, F.; Loewenhoff, Th.; Pintsuk, G.; Hirai, T.; Wirtz, Marius; Durocher, A.; Merola, M.

doi:10.1016/j.nme.2016.10.025

Journal Article

FZJ-2017-06248

Self-castellation of tungsten monoblock under high heat flux loading and impact of material properties

Panayotis, S. (Corresponding author) ; Hirai, T. ; Barabash, V. ; Durocher, A. ; Escourbiac, F. ; Linke, J.FZJ* ; Loewenhoff, T.FZJ* ; Merola, M. ; Pintsuk, G.FZJ* ; Uytdenhouwen, I.FZJ* ; Wirtz, M.FZJ*

2017
Elsevier Amsterdam [u.a.]

Nuclear materials and energy 12, 200-204 (2017) [10.1016/j.nme.2016.10.025]

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Please use a persistent id in citations: http://hdl.handle.net/2128/16319 doi:10.1016/j.nme.2016.10.025

Abstract: 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.

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