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Information × Registration Number 0212U000929, 0107U004067 , R & D reports Title Development of automated methods for structural components distribution quantitative estimation and determination of their relation with stress-strain properties for low-alloyed heat resistant steel popup.stage_title Head Vorobel Roman, Registration Date 06-06-2012 Organization Karpenko Physico-Mechanical Institute of the National Academy of Science of Ukraine popup.description2 The methods for the automated determination of structural changes and micro-defects in steels based on the analysis of metallographic images were created. Correlations between mechanical properties of heat-resistant steels for heat power and petroleum industries with specific structural parameters were revealed. It was found that ferritic grains with large carbides along their borders were dominated in structure of steel 12H1MF after its long-time service in steam pipe-lines. As a result of exploitation steel hardness near the outer and inner surfaces of tubes are lower than in the central part of its cross-section, whereas in the initial state, it almost does not change the thickness of pipe walls. Degradation of steel 15H1M1F under operating conditions is accompanied by a transformation of the structure in the view of decarburization of tempered bainite, disappear of boundaries between neighboring plates of bainite and carbide allocation along them, increasing the number of ferrite grains and carbides on their borders. It is shown that the steady state creep rate of 2,25Cr-1Mo steel in virgin state and after 6•104 h operating in the oil hydrocracking reactor is higher in hydrogen than in air. After steel degradation this rate increases on-air and in hydrogen. Reduction of mechanical properties after the service was linked with reduction of contents of carbon and carbide-forming elements into the matrix. Increasing the density of carbides along the boundaries of sub-grains only visualizes the process of softening of the matrix. Product Description popup.authors Івасенко Ірина Богданівна Бабій Леонтій Омелянович Боцян Володимир Володимирович Владика Галина Ігорівна Журавель Ігор Михайлович Капшій Олег Вірославович Косаревич Ростислав Ярославович Кречковська Галина Василівна Луцик Олексій Андрійович Мандзій Теодор Стефанович Марков Андрій Дмитрович Никифорчин Григорій Миколайович Похмурський Андрій Юрійович Русин Богдан Павлович Свірська Леся Миколаївна Студент Олександра Зіновіївна Ткачук Юлія Миколаївна popup.nrat_date 2020-04-02 Close