Abstract
One of the current problems of the structural integrity assessment of the reactor pressure vessel WWER-1000 is the determination of resistance to brittle fracture taking into account the residual stresses after cladding of the protective anticorrosion layer and heat treatment. Existing data on the residual stresses do not take into account possible microstructural transformations in the base material steel 2.5Cr-Mo-V (15H2NMFA). Mathematical modeling of residual stresses taking into account microstructural phase transformations determines a compression stress area in the heat affected zone of the base material as result of martensite formation. These results were confirmed by dilatometric analysis and metallography of the steel 15H2NMFA templates. The evaluation of resistance to brittle fracture under the thermal shock load showed, that calculated compression residual stresses in the base material HAZ reduce value SIF for cracks of a depth up to 7 mm.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
