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Neutron irradiated ferritic-martensitic 9Cr steels: Effect of helium and nanoscaled ODS particles on microstructure, tensile and fatigue properties

Möslang, A.; Gaganidze, E.; Klimenkov, M; Lindau, R.; Rolli, R.; Schneider, H.Ch.

Abstract (englisch): A good understanding of structure-property correlations in neutron irradiated advanced steels is indispensable for design, lifetime prediction and economical operation of fast breeder and future fusion power reactors. Irradiation campaigns on ferritic-martensitic 9CrlWTaV steels (mostly EUROFER) have been performed at the HFR reactor in The Netherlands up to an accumulated damage dose of 16.3 dpa at irradiation temperatures between 250 and 450°C. In the first campaign 80-5100 appm He has been produced by 10B doping to analyze after irradiation systematically Helium embrittlement at low and high strain rates. While tensile and fatigue tests at low stain rates show no Helium effect up to ~400 appm, Charpy tests at high strain rates reveal a helium related pronounced increase in DBTT of more than 100°C already at 80 appm He. In the second campaign 50 kg EUROFER-ODS was fabricated by powder metallurgy. Compared to EUROFER and other 9CrlWTaV steels the ODS-steel shows in the entire temperature range convincing tensile and fatigue properties after neutron irradiation: much less irradiation hardening, unprecedented uniform elongation and no dislocation channeling induced strain localization. It is to our knowledge the first time that results on neutron irradiated ODS-steels are presented in such a wide temperature range. Correlations are made between strengthening, plasticity, cyclic softening, fatigue lifetime and fracture behavior on the one hand and microstructure evolution on the other hand. Finally conclusions are drawn regarding the microstructural engineering of irradiation tolerant materials.

Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Angewandte Werkstoffphysik (IAM-AWP)
Publikationstyp Vortrag
Jahr 2016
Sprache Englisch
Identifikator KITopen ID: 1000064410
HGF-Programm 31.40.03; LK 01
Erschienen in 2016 MRS Fall Meeting & Exhibit, Symposium ES5, November 27 – December 2 2016, Boston, USA
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