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@ARTICLE{Panayotis:837279,
author = {Panayotis, S. and Hirai, T. and Barabash, V. and Durocher,
A. and Escourbiac, F. and Linke, J. and Loewenhoff, Th. and
Merola, M. and Pintsuk, G. and Uytdenhouwen, I. and Wirtz,
Marius},
title = {{S}elf-castellation of tungsten monoblock under high heat
flux loading and impact of material properties},
journal = {Nuclear materials and energy},
volume = {12},
issn = {2352-1791},
address = {Amsterdam [u.a.]},
publisher = {Elsevier},
reportid = {FZJ-2017-06248},
pages = {200-204},
year = {2017},
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.},
cin = {IEK-4 / IEK-2},
ddc = {333.7},
cid = {I:(DE-Juel1)IEK-4-20101013 / I:(DE-Juel1)IEK-2-20101013},
pnm = {174 - Plasma-Wall-Interaction (POF3-174)},
pid = {G:(DE-HGF)POF3-174},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000417293300027},
doi = {10.1016/j.nme.2016.10.025},
url = {https://juser.fz-juelich.de/record/837279},
}