The Influence of Helium and ODS on the Irradiation-Induced Hardening of Eurofer97 at 300°C

Cornelia Heintze; Frank Bergner; Reinhard Kögler; Rainer Lindau

doi:10.4028/www.scientific.net/AST.73.124

Paper Titles

Fabrication of Fuel and Recycling of Minor Actinides in Fast Reactors
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Influence of the Microstructure on the U_1-yAm_yO_2-x (y= 0.1; 0.15) Pellet Macroscopic Swelling
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Geometrical Aspects of Dislocation-Obstacle Interaction in Iron
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Quantitative TEM Investigations on EUROFER 97 Irradiated up to 32 Dpa
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The Influence of Helium and ODS on the Irradiation-Induced Hardening of Eurofer97 at 300°C
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Advantages Hot Isostatically Pressed Ceramic and Glass-Ceramic Waste Forms Bring to the Immobilization of Challenging Intermediate- and High-Level Nuclear Wastes
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Synthesis and Properties of Reaction-Bonded SiC Ceramic with Embedded UO₂ - TRISO Coated Particles
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New Actinide Waste Forms with Pyrochlore and Garnet Structures
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An Innovative Hybrid Process Involving Plasma in a Cold Crucible Melter Devoted to the Futur Intermediate Level Waste Treatment: The SHIVA Technology
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HomeAdvances in Science and TechnologyAdvances in Science and Technology Vol. 73The Influence of Helium and ODS on the...

The Influence of Helium and ODS on the Irradiation-Induced Hardening of Eurofer97 at 300°C

Abstract:

The influence of helium on the mechanical properties of reduced-activation ferritic/martensitic Cr-steels under fusion-relevant irradiation conditions is still a concern. While the fact that He can influence the mechanical properties is well established [1,2], the underlying mechanisms are not fully understood [1,2]. In this work the effect of He and displacements per atom (dpa) on the irradiation-induced hardening of Eurofer97 at 300°C was studied. Self-ion irradiation was applied to simulate the neutron-irradiation-induced damage. Helium was implanted prior to (pre-implantation), simultaneously (dual-beam irradiation) or following the (post-implantation) self-ion irradiation to investigate the He effect. Nanoindentation was used in order to characterize the damage layer. Under the present conditions (300°C, 1 dpa, 10 appmHe) the observed hardening increased in the following order: single-beam Fe-ion irradiation/pre-implantation < simultaneous implantation < post-implantation. We conclude, that there is a significant interaction between damage and He. Additionally, Eurofer97 and ODS-Eurofer were irradiated with Fe ions up to 1 and 10 dpa to study the effect of the oxide particles on the irradiation-induced hardening. We have found a higher irradiation-induced hardening at 1 dpa for ODS-Eurofer but a steeper hardness increase per dpa up to 10 dpa for Eurofer97.