Comprehensive Analysis of Nanostructure of Oxide Dispersion Strengthened Steels as Prospective Materials for Nuclear Reactors

Increased mechanical properties of oxide dispersion strengthened (ODS) steels are mainly due to the high density of uniformly distributed oxide inclusions. It is well known that some alloying elements, such as Ti, V, Al, … play an important role in the formation of oxides/nanoclusters and affect the density and size of these inclusions. In this paper, a wide range of ODS steels containing various alloying elements are studied. Microstructural analysis was performed by transmission electron microscopy and atom probe tomography. Various types of inclusions were found in the steels: oxides of the Y–Ti–O or Y–Al–O types with sizes of ~2– 15 nm, as well as nanoclusters (2–5 nm) enriched in Y, O, Cr, as well as Ti, V, Al, if these elements were present in the material. It was shown that oxides contribute to the hardening of steels considerably, and clusters did comparable contribution with the contribution of oxides only in Austenitic ODS and 14Cr ODS steels.

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