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New results of the experiments on the study of nature and patterns of the effect of anomalously high ductility of austenitic meta-stable irradiated steels are discussed, the possible causes of its formation and the relationship with the deformation “wave” are analyzed, and the recommendations for “wave” modeling are provided in the paper.

The influence has been studied of thermo-mechanical treatment, sensitization conditions, and neutron irradiation on the pitting corrosion resistance of austenitic 316LN stainless steel variants in 10% FeCl3•6H2O at 22°C. Variants of this steel were modified with additions of nitrogen, manganese, copper, and tungsten, as well as testing cast, coldrolled, grain boundary engineered (GBE), and as-received variants. It was found that the 316LN steel variant with additions of 0.2 % N and 2 % Mn had the best pitting corrosion resistance of all studied conditions. When irradiated in a light water reactor (LWR) to a maximum fluence of 3•10 17 n/cm 2 (E > 1.1 MeV, Tirr < 50°C), neutron irradiation surprisingly increased the resistance of GBE steels to pitting corrosion. An anisotropy of corrosion resistance of GBE and cold rolled steels was observed.