Corrosion is one of the negative effects influencing the current structural materials of nuclear power plants. The adequate corrosion resistance of structural materials, including austenitic stainless steels, has to be also considered in new designs of nuclear power plants. One of the approaches leading to the improvement of the corrosion resistance of steels goes through surface modifications. In this work, the influence of specimens surface treatment on their corrosion resistance was studied on materials for supercritical water reactor (SCWR) applications. The surface of the steels was prepared by different techniques, including sandblasting, polishing, shot peening and machining, in order to obtain information on the point defects behaviour after exposure to the supercritical water for various exposure times. The microstructural changes of studied steels 800HT and 310S were investigated by Pulsed Low Energy Positron System (PLEPS) [1,2]. A very distinct depth profile of point defects was observed in polished specimens, and the results indicate a significant decrease of the positron diffusion towards the surface in all mechanically modified samples. The increase of the SCW exposure time led to a clearly visible change in the obtained positron lifetimes, i.e., in the size of microstructural defects.
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2 November 2021
APPLIED PHYSICS OF CONDENSED MATTER (APCOM 2021)
23–25 June 2021
Štrbske Pleso, Slovak Republic
Research Article|
November 02 2021
Influence of corrosive environments on steels studied by positron annihilation spectroscopy
Stanislav Sojak;
Stanislav Sojak
a)
1
Slovak University of Technology in Bratislava, Faculty of Electrical Engineering and Information Technology, Institute of Nuclear and Physical Engineering
, Ilkovičova 3, Bratislava, 812 19, Slovakia
2
Slovak University of Technology in Bratislava, Faculty of Materials Science and Technology in Trnava, Advanced Technologies Research Institute
, Jána Bottu 25, Trnava, 91724, Slovakia
a)Corresponding author: stanislav.sojak@stuba.sk
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Vladimir Krsjak;
Vladimir Krsjak
1
Slovak University of Technology in Bratislava, Faculty of Electrical Engineering and Information Technology, Institute of Nuclear and Physical Engineering
, Ilkovičova 3, Bratislava, 812 19, Slovakia
2
Slovak University of Technology in Bratislava, Faculty of Materials Science and Technology in Trnava, Advanced Technologies Research Institute
, Jána Bottu 25, Trnava, 91724, Slovakia
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Jarmila Degmova;
Jarmila Degmova
1
Slovak University of Technology in Bratislava, Faculty of Electrical Engineering and Information Technology, Institute of Nuclear and Physical Engineering
, Ilkovičova 3, Bratislava, 812 19, Slovakia
2
Slovak University of Technology in Bratislava, Faculty of Materials Science and Technology in Trnava, Advanced Technologies Research Institute
, Jána Bottu 25, Trnava, 91724, Slovakia
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Martin Petriska;
Martin Petriska
1
Slovak University of Technology in Bratislava, Faculty of Electrical Engineering and Information Technology, Institute of Nuclear and Physical Engineering
, Ilkovičova 3, Bratislava, 812 19, Slovakia
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Vladimir Slugen
Vladimir Slugen
1
Slovak University of Technology in Bratislava, Faculty of Electrical Engineering and Information Technology, Institute of Nuclear and Physical Engineering
, Ilkovičova 3, Bratislava, 812 19, Slovakia
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a)Corresponding author: stanislav.sojak@stuba.sk
AIP Conf. Proc. 2411, 080012 (2021)
Citation
Stanislav Sojak, Vladimir Krsjak, Jarmila Degmova, Martin Petriska, Vladimir Slugen; Influence of corrosive environments on steels studied by positron annihilation spectroscopy. AIP Conf. Proc. 2 November 2021; 2411 (1): 080012. https://doi.org/10.1063/5.0067349
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