Precipitation of oxide dispersion strength steels after long-term annealing at temperature of 475 °C

Dávid Košovský; Marcel Miglierini; Tomáš Kmječ; Július Dekan; Marek Bujdoš

doi:10.14311/AP.2024.64.0103

Authors

Dávid Košovský Slovak University of Technology in Bratislava, Faculty of Electrical Engineering and Information Technology, Institute of Nuclear and Physical Engineering, Ilkovičova 3, 841 04 Bratislava, Slovakia
Marcel Miglierini Slovak University of Technology in Bratislava, Faculty of Electrical Engineering and Information Technology, Institute of Nuclear and Physical Engineering, Ilkovičova 3, 841 04 Bratislava, Slovakia; Czech Technical University in Prague, Faculty of Nuclear Science and Physical Engineering, Department of Nuclear Reactors, V Holešovičkách 2, 180 00 Praha, Czech Republic
Tomáš Kmječ Charles University, Faculty of Mathematics and Physics, V Holešovičkách 2, 180 00 Praha, Czech Republic; Czech Academy of Sciences, Institute of Physics, Na Slovance 2, 182 00 Praha, Czech Republic
Július Dekan Slovak University of Technology in Bratislava, Faculty of Electrical Engineering and Information Technology, Institute of Nuclear and Physical Engineering, Ilkovičova 3, 841 04 Bratislava, Slovakia
Marek Bujdoš Comenius University, Faculty of Natural Sciences, Ilkovičova 6, 842 15 Bratislava, Slovakia

DOI:

https://doi.org/10.14311/AP.2024.64.0103

Keywords:

high-chromium steel, hyperfine interactions, Mössbauer spectrometry, atom probe tomography, stainless steel, ferritic-martensitic steel

Abstract

Oxide dispersion strengthened steels are key alloys used in nuclear installations. Steels with chromium content of up to 10 wt % are suitable due to their advantageous properties and these alloys are used for the construction of technological devices in the primary circuit of nuclear power plants. From other studies, it can be concluded that chromium has anti-corrosive properties due to the formation of a passivation layer, which results in reduced activation of the material by thermal neutrons. Macroscopic properties are determined by their microstructure, and therefore, the description of the microstructure is important. Transmission Mössbauer spectroscopy and atom probe tomography were used to characterise the material. This provides information about the physical and/or chemical environment of the resonant atoms can be obtained. Obtained spectral parameters reach saturation values from which the solubility limit of chromium in iron can be determined. In Cr-rich phase, the solubility limit can be estimated from the value of spectral parameters of the single-line in the spectrum annealed for the longest time. The suggested procedures are subsequently applied to the case studies of stainless steels suitable for the construction of various components of the III+/IV^th generation of nuclear reactors (including fast and fusion reactors).

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