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

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...

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Bibliographic Details
Published in:Journal of physics. Conference series 2013-01, Vol.443 (1), p.12016-4
Main Authors: Veternikova, J, Slugen, V, Stancek, S, Degmova, J, Sabelova, V, Sojak, S, Petriska, M, Hinca, R
Format: Article
Language:English
Subjects:
Alpha particles
Alpha rays
Chromium
Defects
Dispersion hardening steels
Ferritic stainless steels
Ferrous alloys
Helium ions
Ion implantation
Mathematical analysis
Microstructure
Physics
Positron annihilation
Positrons
Radiation
Radiation tolerance
Superalloys
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Summary: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.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/443/1/012016