TY  - JOUR
AU  - Panayotis, S.
AU  - Hirai, T.
AU  - Barabash, V.
AU  - Durocher, A.
AU  - Escourbiac, F.
AU  - Linke, J.
AU  - Loewenhoff, Th.
AU  - Merola, M.
AU  - Pintsuk, G.
AU  - Uytdenhouwen, I.
AU  - Wirtz, Marius
TI  - Self-castellation of tungsten monoblock under high heat flux loading and impact of material properties
JO  - Nuclear materials and energy
VL  - 12
SN  - 2352-1791
CY  - Amsterdam [u.a.]
PB  - Elsevier
M1  - FZJ-2017-06248
SP  - 200-204
PY  - 2017
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000417293300027
DO  - DOI:10.1016/j.nme.2016.10.025
UR  - https://juser.fz-juelich.de/record/837279
ER  -