Evolution of Secondary-Phase Precipitates during Annealing of the 12Kh18N9T Steel Irradiated with Neutrons to a Dose of 5 DPA

摘要

The formation and evolution of thermally-induced secondary precipitates in an austenitic stainless steel 12Kh18N9T irradiated in the core of a laboratory reactor VVR-K to a dose of 5 dpa and subjected to post-radiation isochronous annealings for 1 h in a temperature range from 450 to 1050 deg C have been studied using transmission electron microscopy (TEM) and microhardness measurements. It has been shown that the formation of stitch (secondary) titanium carbides and M_(23)C_6 carbides at grain and twin boundaries after annealing at 1050 deg C is preceded by a complex evolution of fineparticles of secondary phases (titanium carbides and nitrides) precipitated at dislocation loops and dislocations during annealing at temperatures above 750 deg C.