Gamma-alpha irradiation induced transition in austenitic stainless steels irradiated with high doses and their some consequences under deformation

Results of study both mechanical properties and structure of two metastable austenitic stainless steels irradiated up to a high doses are presented. The 08Cr18Ni10Ti steel irradiation was carried out at the SM high current reactor core by mixed neutron spectrum at 70-120 deg C in the reactor coolant medium - distil water. By the neutron monitors measurements the maximal fast neutrons fluence makes up the value 5.3·1026 nm-2 (E>0.1 MeV). The 09Cr15Ni10Pb3B steel samples have been irradiated at the BOR-60 reactor at temperatures ∼320 deg C, 340 deg C, 380 deg C up to fluences 0.3·1026 nm-2, 1.8·1026 nm-2, 1.3·1026 nm-2 respectively. From the tension diagram, X-ray structural and electron microscopic data the evidences of radiation-induced martensite formation in the austenitic matrix and martensite transformation temperature increase in the irradiated steel have been obtained. The connection between microstructure and radiation hardening, as well as a silicon content were discussed