PLEPS study of ions implanted RAFM steels

13th International Workshop on Slow Positron Beam Techniques and Applications

Sojak, S.^1 ; Slugen, V.^1 ; Egger, W.^2 ; Ravelli, L.^2 ; Petriska, M.^1 ; Veterníková, J.^1 ; Stacho, M.^1 ; Sabelová, V.^1

Slovak University of Technology, Institute of Nuclear and Physical Engineering, Ilkoviova 3, 812 19 Bratislava, Slovakia^1

LRT2, Universitaet der Bundeswehr Muenchen, Werner-Heisenberg-Weg 39, D-85577 Neubiberg, Germany^2

关键词: Chromium contents;    Mechanical resistance;    Microstructural changes;    Pulsed low energy positron systems;    Radiation defects;    Reduced-activation ferritic/martensitic steels;    Vacancy cluster;    Vacancy-type defects;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/505/1/012016/pdf
DOI  :  10.1088/1742-6596/505/1/012016

来源: IOP

【 摘 要 】

Current nuclear power plants (NPP) require radiation, heat and mechanical resistance of their structural materials with the ability to stay operational during NPP planned lifetime. Radiation damage much higher, than in the current NPP, is expected in new generations of nuclear power plants, such as Generation IV and fusion reactors. Investigation of perspective structural materials for new generations of nuclear power plants is among others focused on study of reduced activation ferritic/martensitic (RAFM) steels. These steels have good characteristics as reduced activation, good resistance to volume swelling, good radiation, and heat resistance. Our experiments were focused on the study of microstructural changes of binary Fe-Cr alloys with different chromium content after irradiation, experimentally simulated by ion implantations. Fe-Cr alloys were examined, by Pulsed Low Energy Positron System (PLEPS) at FRM II reactor in Garching (Munich), after helium ion implantations at the dose of 0.1 C/cm2. The investigation was focused on the chromium effect and the radiation defects resistivity. In particular, the vacancy type defects (monovacancies, vacancy clusters) have been studied. Based on our previous results achieved by conventional lifetime technique, the decrease of the defects size with increasing content of chromium is expected also for PLEPS measurements.