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Neutron Irradiation Resistance of RAFM Steels

Published online by Cambridge University Press:  26 February 2011

Ermile Gaganidze ,
Bernhard Dafferner  and
Jarir Aktaa
Ermile Gaganidze
Affiliation:
[email protected], Forschungszentrum Karlsruhe, Institute for Materials Research II, Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen, 76344, Germany, +49-7247-824083, +49-7247-824566
Bernhard Dafferner
Affiliation:
[email protected], Forschungszentrum Karlsruhe, Institute for Materials Research II, Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen, 76344, Germany
Jarir Aktaa
Affiliation:
[email protected], Forschungszentrum Karlsruhe, Institute for Materials Research II, Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen, 76344, Germany
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Abstract

The neutron irradiation resistance of the reduced-activation ferritic/martensitic (RAFM) steel EUROFER97 and international reference steels (F82H-mod, OPTIFER-Ia, GA3X and MANET-I) have been investigated after irradiation in the Petten High Flux Reactor up to 16.3 dpa at different irradiation temperatures (250-450 ¡ãC). The embrittlement behavior and hardening are investigated by instrumented Charpy-V tests with subsize specimens.

Neutron irradiation-induced embrittlement and hardening of EUROFER97 was studied under different heat treatment conditions. Embrittlement and hardening of as-delivered EUROFER97 steel are comparable to those of reference steels. Heat treatment of EUROFER97 at a higher austenitizing temperature substantially improves the embrittlement behaviour at low irradiation temperatures. Analysis of embrittlement vs. hardening behavior of RAFM steels within a proper model in terms of the parameter C=DDBTT/Ds indicates hardening-dominated embrittlement at irradiation temperatures below 350 ¡ãC with 0.17 ¡Ü C ¡Ü 0.53 ¡ãC/MPa. Scattering of C at irradiation temperatures above 400 ¡ãC indicates non hardening embrittlement. A role of He in a process of embrittlement is investigated in EUROFER97 based steels, that are doped with different contents of natural B and the separated 10B-isotope (0.008-0.112 wt.%).

Testing on small scale fracture mechanical specimens for determination of quasi-static fracture toughness will be also presented in a view of future irradiation campaigns.

Keywords

embrittlementneutron irradiationfracture
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 981: Symposium JJ – Structural and Refractory Materials for Fusion and Fission Technologies , 2006 , 0981-JJ03-08
Copyright
Copyright © Materials Research Society 2007

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References

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