Positron study of alpha particles effect on oxide-dispersion-strengthened steels

16th International Conference on Positron Annihilation

Veternikova, J.^1 ; Slugen, V.^1 ; Stancek, S.^1 ; Degmova, J.^1 ; Sabelova, V.^1 ; Sojak, S.^1 ; Petriska, M.^1 ; Hinca, R.^1

Institute of Nuclear and Physical Engineering, Faculty of Electrical Engineering and Information Technology, Slovak University of Technology, Ilkovicova 3, 812 19 Bratislava, Slovakia^1

关键词: Chromium contents;    Defect accumulation;    Defect concentrations;    Microstructure changes;    Oxide dispersion strengthened steel;    Positron annihilation lifetime spectroscopy;    Radiation resistance;    Radiation treatments;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/443/1/012016/pdf
DOI  :  10.1088/1742-6596/443/1/012016

来源: IOP

【 摘 要 】

Microstructure of oxide-dispersion-strengthened steels with different chromium content-MA 956 (20% Cr), ODM 751 (16% Cr) and MA 957 (14% Cr) were studied by positron annihilation lifetime spectroscopy. Samples were measured before and after helium ion implantation (He2+); therefore microstructure changes and radiation resistance to alpha particles of these steels were observed. Defect accumulation due to the radiation treatment was proven in all investigated materials. After ion implantation, mean lifetimes increased of about ∼ 10 ps, which indicates significant change in microstructure. According to calculations of a defect volume from defect concentration and pre-dominant size of defects, ODM 751 is the most resistant steel in comparison to other investigated materials.