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Title:
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Irradiation testing of stainless steel plate material and weldments: report on ITER task T14, part A: low cycle fatigue properties after 0.5 and 5 dpa at 350 K
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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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1997
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ECN report number:
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Document type:
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ECN-C--97-087
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ECN publication
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Number of pages:
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Full text:
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38
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Download PDF
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Abstract:
The low cycle fatigue properties of unirradiated and neutron irradiatedType 316LN-SPH stainless steel plate and EB welded material have been
measured at a temperature of 350K. Miniaturized test specimens of the
European reference heat 1 for fusion (ERH1) have been irradiated in the High
Flux Reactor (HFR) of Petten, Netherlands, simulating the first wall
conditions by a combination of high displacement damage with high amounts of
helium. This work was performed as part of the European Fusion Technology
Programme for ITER as 'Irradiation testing of stainless steel'. The report
contains the experimental conditions and summarizes the test results. The
stress strain response of EB welded material was found to be identical to
that of plate material. For both plate and weldments a large increase in
first cycle tensile stress is observed, which saturates within 0.7 dpa. The
irradiated material shows continuous cyclic softening during low cycle
fatigue testing, decreasing to about the stress level of unirradiated
material at fatigue life. EB welded material tends to have longer mean
fatigue lives than plate material, but the data have overlapping scatter
bands. Material irradiated to 0.7 dpa and material irradiated to 5 dpa show
similar fatigue life behaviour as unirradiated material. It is demonstrated
that the RCC-MR curve is sufficiently conservative for use as design curve in
case of application of Type 316LN-SPH plate and EB- welded material at the
temperature of 350K. Furthermore, it is also demonstrated that for
irradiation damage dose levels up to 5 dpa at 350K there is no need to apply
additional safety factors for the number of allowable cycles up to 105
cycles. 15 figs., 6 tabs., 18 refs.
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