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Irradiation testing of stainless steel plate material and weldments: report on ITER task T14, part C: fracture toughness up to 5 dpa at 350 and 525 K
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ECN-C--97-089 ECN rapport
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The fracture toughness properties of unirradiated and neutron irradiatedSPH stainless steel plate, EB weldments, and full 16-8 TIG-deposits have been measured. Compact tension specimens with a thickness of 10 and 12 mm of the European Reference Heat 1 and 2 (ERH1 and ERH2) were irradiated in the High Flux Reactor (HFR) in Petten, The Netherlands, simulating the first wall conditions by a combination of high displacement damage with proportional amounts of helium. Helium contents are in the range of 10 to 60 appm depending on dose level. The irradiation conditions were 0.5 and 5 displacements per atom (dpa) at 350K and 0.5, 2.7, 3.6, 5, and 6 dpa at 525K. Testing temperatures were 353, 523, and 723K. The report contains the experimental conditions and summarises the results, which are given in terms of J-resistance curve fits, J0.2BL and J1mm. This report closes the final deliverable ECN-6 of ITER Task T14. The main conclusions include that the 0.5 dpa, 350K irradiation gives a considerable reduction in J-toughness in plate materials and TIG deposit. The TIG deposit in general, however, shows less irradiation induced reduction of fracture toughness than the ERH materials. The increase of the dose up to 5 dpa does not give a further significant decrease in fracture toughness for the above materials, which implies saturation at 350K. The EB-welded ERH2 does not show degradation saturation for 350K, 0.5 dpa for testing temperatures other than 723K. The 525K irradiations for all materials induce a gradual decrease in fracture toughness up to the maximum of 5 to 6 dpa. EB and plate are comparable in fracture toughness with respect to the actual J-energy levels necessary for crack extension, where TIG deposit needs less J-energy for crack growth. 35 figs., 40 tabs., 22 refs.

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