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Information × Registration Number 0221U101215, 0119U101919 , R & D reports Title Investigation of the influence of the characteristics of the distribution of residual stresses in the zone of composite welded joints on the calculated evaluation of the strength and life of the elements of the equipment of nuclear power plants popup.stage_title Head Makhnenko Oleg V., Доктор технічних наук Registration Date 17-01-2021 Organization E.O.Paton Elektric Welding Institute National Academy of scinces of Ukraine popup.description2  For composite welded joints (connection of the pipe with the cover of the reactor body WWER-1000 and the connection of the collector with the pipe of the steam generator body) finite-element models have been developed that take into account the difference between thermophysical and mechanical properties of the connecting materials. , as well as welding and surfacing materials. The models also take into account the complex geometry of the joints and the sequence of welds and surfacing, which allows to obtain a solution to the problem of thermoplastic deformation of the material as a result of sequential tracking of the kinetics of formation and development of stresses and strains in multi-pass welding. Numerical studies were carried out and the distributions of the microstructural phase composition in the HAZ of the connection pipes (steel 20 and steel 22K of the ferrite class), as well as in the HAZ of the main material of the reactor vessel cover (steel 15X2NMFA of the pearlite class) were obtained. It is determined that with insufficient level of preheating the formation of structural elements from ferritic-perlite materials of martensitic-bainite structure is possible in HAZ, and accordingly complex inhomogeneous distribution of residual stresses in the zone of welded joint with characteristic local zones of compressive stresses due to formation of hardened structures Product Description popup.authors Basystyuk Nazar R Velikoivanenko Elena A Kandala Stepan M Kostenevich Elena S. Milenin Olexey S Makhnenko Oleg V Muzhychenko Olexander F Pivtorak Nina I Rozynka Galina P Savitskaya Elena M Saprykina Galina Yu popup.nrat_date 2021-01-17 Close