Nanostructure Evolution of Oxide Dispersion Strengthened Steels under Fe Ion Irradiation at 350°C

Improved mechanical properties of oxide dispersion strengthened (ODS) steels, promising reactor core materials, are due to the high density of uniformly distributed nanosized oxide inclusions. Transformation of the nanostructure of ODS steels under irradiation determines their stability during operation in the reactor conditions. In this work, three ODS steels were studied: Eurofer ODS, 10Cr ODS, and KP-3 ODS with various alloying systems. In these steels, the chromium content varies from 9 to 14 at. %, as well as such alloying elements as V, Ti, Al, W and Mn are present in various ratios. The effect of irradiation with iron ions up to 3, 6, and 30 dpa at a temperature of 350°C was studied. Radiation-induced changes were analyzed by transmission electron microscopy and atomic probe tomography. Although the size of the inclusions under irradiation practically did not change, a decrease in their bulk density was observed. On the whole, the hardening of the ODS steels due to inclusions during irradiation to 30 dpa at 350°C changed insignificantly, which indicates their radiation resistance and low tendency of the studied ODS steels to low-temperature radiation hardening and embrittlement.

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