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Title:
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Low cycle fatigue properties of neutron irradiated solid-HIP 316L(N): ITER task T214, NET deliverable GB6 ECN-5
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Author(s):
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Published by:
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Publication date:
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ECN
NUCLEAIR
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1998
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ECN report number:
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Document type:
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ECN-C--98-034
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ECN publication
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Number of pages:
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Full text:
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26
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Download PDF
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Abstract:
The Low Cycle Fatigue (LCF) properties of neutron irradiated HotIsostatically Pressed (HIP) joints of type 316L(N) stainless steel (heat
PM-130) have been measured, as well as the LCF properties of reference
316L(N)-ERHII. Cylindrical LCF test specimens of 3 mm diameter were
irradiated in the High Flux Reactor (HFR) in Petten, The Netherlands,
simulating the first wall conditions of future fusion reactors by a
combination of high displacement damage with proportional amounts of helium.
The solid HIP specimens were irradiated up to a target dose level of 5 dpa at
a temperature of 550K. The damage levels realised range from 3.0 to 4.4 dpa,
with helium contents up to 41 appm. Testing temperature was equal to the
irradiation temperature: 550K. The report contains the experimental
conditions and summarises the results, which are given in terms of first
cycle stress, the peak stress, the number of cycles where the peak stress is
reached, the stress at half life and the plastic strain at half life, and the
total number of cycles to failure, Nf. The main conclusions are that the
unirradiated solid-HIP materials has the same LCF properties as unirradiated
316L(N)-ERHII plate material. The neutron irradiation induces both hardening
and reduction of fatigue life. The bond does not seem to have any effect on
the fatigue properties for the unirradiated solid HIP 316L(N), whereas a
combined effect of irradiation and the bond cannot be established. No
failures related to debonding of the joint were observed for the tests. 7
refs.
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