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Information × Registration Number 0221U100536, 0119U101673 , R & D reports Title Prediction of resource of the main circulation pipelines of the VVER-1000 reactors based on study of the metal by direct methods during 200 thousand hours of operation popup.stage_title Head Gozhenko Sergiy V., Кандидат технічних наук Registration Date 07-01-2021 Organization National Science Center "Kharkiv Institute of Physics and Technology" popup.description2 Research Report: 36 p., 20 fig., 7 tables, 16 sources. MAIN CIRCULATION PIPELINE, STEEL GRADE 10GН2MФA, STRUCTURE, MECHANICAL PROPERTIES, FRACTOGRAPHIC FEATURES For deep research by direct methods the microsamples were made from the main metal of main circulation pipeline (MCP) of the power unit #3 of the South-Ukraine NPP after 200,000 hrs of operation. A structure of MCP main metal is investigated by metallographic and electron microscopy methods using scanning electron microscope and transmission electron microscope. It is shown that in the process of operation there is an evolution of inclusions on the borders of grains and increase of dislocation density in separate grains. Mechanical properties (border of durability, conditional border of fluidity, relative lengthening and narrowing - at 20°С and 350°С, shock viscidity at 20°С) of MPC main metal are determined. The fractographic signs of fractures are analyzed after tests on tension and shock bend. Fractographic research of surfaces of destruction of samples showed that destructions of steel grade 10ГН2МФА after 200,000 hrs of operation are ductile. The study showed that mechanical properties and structure of MCP metal after 200,000 hrs of operation meet the normative requirements to the MCP metal of NPP units. The results of tests of main metal in the initial state and after 100,000 and 200,000 hrs of operation are compared. It is shown that in the process of operation the rate of changes of mechanical properties of metal decreased, in particular during the last 100,000 hrs of operation as compared to previous period. Product Description popup.authors Bykasov Konstantin V Vasilenko Ruslan L Voevodin Viktor M Gozhenko Sergiy V Krainiuk Yevhen О. Mischenko Pavlo O Mitrofanov Anatoliy S Rudenko Oleksiy H popup.nrat_date 2021-03-17 Close