Stability of voids, dislocations and precipitation particles of steel OKh16N15M3B neutron irradiated after austenization and mechanico-thermal treatment

By a method of etectron-microscopic study the kinetics of void annealing, precipitation and dislocations in steel OKh16N15M3B irradiated in reactor BOR-60 by neutron fluence of 6.6x102/H2 neutr./cm2 of E>0.1 MeV at 470 deg C Was investigated. The steel was under two conditions before the irradiation: austenization and mechanico-thermal treatment. A range of isothermal annealings at 85O deg C othe irradiated steel led to a decrease of voids concentration formed as a result of radiation and phase precipitation particles, also the decrease of dislocation density. These treatments lead to the growth of an average size of particles and voids. The most variations of these parameters were observed at small times of annealing. It was estimated that the variation of dislocation structure under the annealing was fully controlled by a degree of oversaturation of vacancies, and the evolution of phase precipitation particle was submitted to a mechanism of coalescence. It was estimated that helium formed due to irras diation may not influence on the bubble gas formation of 20 A in diameter