Reduced Activation Ferritic Martensitic (RAFM) steels for fusion and fission application Unraveling irradiation-induced embrittlement in steels for nuclear.

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Reduced Activation Ferritic Martensitic (RAFM) steels for fusion and fission application Unraveling irradiation-induced embrittlement in steels for nuclear applications Inês Carvalho, Alexander Fedorov, Henk Schut, Jilt Sietsma, A. Ilker Topuz, Erik van der Giessen

Modelling of irradiation-induced hardening and creep in F/M alloys Task 2.1.2 – Study of effect of Cr-Ni-(Si/P) clusters on irradiation hardening 2.1.2.3 Attempt to develop a numerical framework to predict how irradiation affects dislocation mobility and, by that, promotes brittle failure and increases the ductile-to-brittle transition. Principal Investigator: Alexander Fedorov NRG

Two PhD projects: NRG-M2i-TU Delft-RUG PhD at TU Delft: Inês Carvalho Project title: Reduced Activation Ferritic Martensitic (RAFM) steels for fusion application Aim of the project: to establish a relationship between the irradiation-induced defect structures and the observed changes in the mechanical properties Participation: TU Delft: Ines Carvalho, Jilt Sietsma (Prof.), Henk Schut, NRG : Alexander Fedorov, Natalia Luzginova PhD at University of Groningen (RUG): Ilker Topuz Project title: Unraveling irradiation-induced embrittlement in steels for nuclear applications Aim of the project: to generate understanding on the competition between plastic deformation and brittle crack propagation in irradiated steels at various temperatures. The numerical framework that will be developed (DD) should be able to serve as a tool to predict irradiation embrittlement of prototype alloys. RUG: : Ilker Topuz, Erik van der Giessen (Prof.) TU Delft: Lucia Nicola NRG: Alexander Fedorov, Natalia Luzginova

PhD in TU Delft: Reduced Activation Ferritic Martensitic (RAFM) steels for fusion application MAT-IREMEV, Garching, 3–5 December 2012

NRG mechanical tests data base on EUROFER (ODS) Bird's-eye view on two projects MD: interaction between defects and dislocations NRG mechanical tests data base on EUROFER (ODS) MF: evolution of point defect clusters with dose and temperature DD modeling (RUG) Nrg has mechanical test data on neutron irradiated samples (sumo)\ Goal-explain and model the results TDS/PA (experimental) characterize defects (ion implantation) in terms of thermal stability, concentration, sizes We use TDS/PA results+literature data (MD&MF(mean field) calculation results) to feed into DD model (concentration of defects, (or their mean distance) and their integration with dislocations) TDS and PA experiments (TUD) other experiments on EUROFER (ODS) and Fe-Cr found in the literature

Summary of PA and TDS observations At implantation temperature (RT) Vacancies are barely mobile  their concentration is relatively high and strongly depends on the temperature and implantation current  low reproducibility and difficult to compare different experiments vacancy clusters are unstable at RT. 300-600K, HemVn clusters lose vacancies; He:V ratio increases

Dislocation Source-Obstacle Interaction crack cohesive zone K field s, e source obstacle

Transition from 3D to 1D work is in progress