29 results on '"Ingot"'
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2. отриМаннЯ ДЕФорМоВаниХ наПіВФабриКатіВ цирКоніЄВоГо сПлаВУ із злиВКіВ, ВиПлаВлЕниХ сПособоМ ДУГоВоГо ПЕрЕПлаВУ з нЕВитратниМ ЕлЕКтроДоМ У ГарнісаЖніЙ ПЕЧі.
- Author
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Капустян, О. Є. and Овчинникова, І. А.
- Abstract
Copyright of Electrometallurgy Today / Sovremennaya Elektrometallurgiya is the property of International Association Welding (Paton Publishing House) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2021
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3. Cronica descoperirilor monetare (X) / Chronicle of monetary findings (X)
- Author
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Ana Boldureanu
- Subjects
coin findings ,siliqua ,denarius ,ingot ,groschen ,Auxiliary sciences of history ,Archaeology ,CC1-960 - Abstract
The author presents data on coin findings in the Republic of Moldova, about which there are known from the discoverers or from some communications or publications of the second half of 2015 and the first half of 2016. Among the ancient coin issues there are a hoard of siliquae found at Lărguţa (Cantemir District) and some isolated finds of Roman coins. The Middle Ages are represented by an ingot of the sommo type, originated from the Old Orhei area, a few small complexes from Costeşti (Ialoveni District), Old Orhei, and Alcedar (Şoldăneşti District), and the coins found during excavations in the Soroca Fortress in 2015.
- Published
- 2016
4. ЛАБОРАТОРНАЯ ЭЛЕКТРОННО-ЛУЧЕВАЯ УСТАНОВКА УЭ-208М
- Author
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Ахонин, С. В., Пикулин, А. Н., Березос, В. А., Ковальчук, Д. В., and Тугай, С. Б.
- Abstract
Copyright of Electrometallurgy Today / Sovremennaya Elektrometallurgiya is the property of International Association Welding (Paton Publishing House) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2019
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5. НОВЫЕ ПЕРСПЕКТИВНЫЕ СПЛАВЫ НА ОСНОВЕ ТИТАНА
- Author
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Ахонин, С. В., Березос, В. А., and Белоус, В. Ю.
- Abstract
Copyright of Electrometallurgy Today / Sovremennaya Elektrometallurgiya is the property of International Association Welding (Paton Publishing House) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2019
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6. ИНТЕНСИВНОСТЬ ПРОТЕКАНИЯ ФИЗИКО-ХИМИЧЕСКИХ РЕАКЦИЙ В ПРОЦЕССАХ СПЕЦИАЛьНОЙ ЭЛЕКТРОМЕТАЛЛУРГИИ
- Author
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Григоренко, Г. М. and Козин, Р. В.
- Abstract
Copyright of Electrometallurgy Today / Sovremennaya Elektrometallurgiya is the property of International Association Welding (Paton Publishing House) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2019
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7. ЭШП В НЕОХЛАЖДАЕМОЙ СТАЛЬНОЙ ФОРМЕ.
- Author
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Биктагиров, Ф. К., Шаповалов, В. А., Веретильник, А. В., Игнатов, А. П., and Гнатушенко, А. В.
- Abstract
Copyright of Electrometallurgy Today / Sovremennaya Elektrometallurgiya is the property of International Association Welding (Paton Publishing House) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2019
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8. СТРУКТУРА И СВОЙСТВА ЖАРОПРОЧНОГО ПСЕВДО-α-ТИТАНОВОГО СПЛАВА СИСТЕМы Ti-Al-Sn-Zr-Mo-V-Si И ЕГО СВАРНыХ СОЕДИНЕНИЙ
- Author
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Григоренко, С. Г., Белоус, В. Ю., Таранова, Т. Г., Вржижевский, Э. Л., and Костин, В. А.
- Abstract
Copyright of Electrometallurgy Today / Sovremennaya Elektrometallurgiya is the property of International Association Welding (Paton Publishing House) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2019
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9. ЭЛЕКТРОННО-ЛУЧЕВАЯ ВЫПЛАВКА ЖАРОПРОЧНЫХ ТИТАНОВЫХ КОМПОЗИТОВ СИСТЕМЫ Ti-Si-Al-Zr-Sn
- Author
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Ахонин, С. В., Северин, А. Ю., Фирстов, С. А., Кузьменко, Н. Н., Березос, В. А., and Кулак, Л. Д.
- Abstract
Copyright of Electrometallurgy Today / Sovremennaya Elektrometallurgiya is the property of International Association Welding (Paton Publishing House) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2019
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10. ПОЛУЧЕНИЕ ТИТАНОВОГО СПЛАВА ОТ4, ЛЕГИРОВАННОГО МАРГАНЦЕМ, В ЭЛЕКТРОШЛАКОВОЙ ПЕЧИ КАМЕРНОГО ТИПА
- Author
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Протоковилов, И. В., Петров, Д. А., and Порохонько, В. Б.
- Abstract
Copyright of Electrometallurgy Today / Sovremennaya Elektrometallurgiya is the property of International Association Welding (Paton Publishing House) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2019
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11. ИНДУКЦИОННАЯ ПЛАВКА В СЕКЦИОННОМ КРИСТАЛЛИЗАТОРЕ
- Author
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Патон, Б. Е., Григоренко, Г. М., and Шейко, И. В.
- Abstract
Copyright of Electrometallurgy Today / Sovremennaya Elektrometallurgiya is the property of International Association Welding (Paton Publishing House) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2019
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12. ТЕХНОЛОГИЯ ВЫПЛАВКИ СЛИТКОВ КОБАЛЬТОВОГО СПЛАВА СПОСОБОМ ДУГОВОГО ПЕРЕПЛАВА
- Author
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Овчинников, А. В., Ефанов, В. С., Теслевич, С. М., and Тизенберг, Д. Л.
- Abstract
Copyright of Electrometallurgy Today / Sovremennaya Elektrometallurgiya is the property of International Association Welding (Paton Publishing House) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2019
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13. ОСОБЕННОСТИ СТРУКТУРООБРАЗОВАНИЯ ПРЕЦИЗИОННОГО СПЛАВА 29НК ПРИ ЭШП С ПОРЦИОННЫМ ФОРМИРОВАНИЕМ СЛИТКА
- Author
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Протоковилов, И. В., Назарчук, А. Т., Петров, Д. А., and Порохонько, В. Б.
- Abstract
Copyright of Electrometallurgy Today / Sovremennaya Elektrometallurgiya is the property of International Association Welding (Paton Publishing House) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2019
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14. ТЕНДЕНЦИИ РАЗВИТИЯ СПЕЦИАЛЬНОЙ ЭЛЕКТРОМЕТАЛЛУРГИИ ТИТАНА В УКРАИНЕ
- Author
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АХОНИН, С. В.
- Abstract
The analysis was carried out on the main tendencies of development of special electrometallurgy of titanium in Ukraine. It is one of five countries, having complete cycle of titanium production from extraction of titanium-containing ores, their enrichment and production of spongy titanium to melting of titanium ingots and production of virtually complete spectrum of titanium semi-finished products. Metallurgical processing of spongy titanium into ingots in Ukraine is based on technology of electronbeam melting with intermediate crucible, which finds wide application in the world for melting of ingot-slabs. This technology provides guaranteed removal of refractory inclusions and provides the possibility to get the ingots of various cross section per one melting from charge materials of low price that provides high technical-economical indices of melting process. Production of semi-finished products of titanium alloys from the ingots was organized at the Ukrainian enterprises. There are castings, forgings, rods, hot and cold-rolled pipes, mechanical properties of which correspond to requirements of the standards. Today Ukraine has got a competitive for the world‘s markets production of high-quality ingots and ingot-slabs from titanium and alloys on its basis, which has large perspectives for further development. 8 Ref., 1 Tabl., 10 Fig. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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15. ЭНЕРГОЭФФЕКТИВНАЯ ДЕЗИНТЕГРАЦИЯ ФЕРРОМАТЕРИАЛОВ
- Author
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Кузбаков, Ж. И.
- Abstract
Copyright of News of Kazakhstan Science / Novosti nauki Kazahstana is the property of NCSTE (JSC National Center for State Scientific and Technical Evaluations) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2018
16. РАЗВИТИЕ ТЕХНОЛОГИЙ ЭЛЕКТРОННО-ЛУЧЕВОЙ ПЛАВКИ МЕТАЛЛОВ В ИЭС ИМ. Е. О. ПАТОНА НАН УКРАИНЫ
- Author
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Патон, Б. Е., Ахонин, С. В., and Березосv, В. А.
- Abstract
Copyright of Electrometallurgy Today / Sovremennaya Elektrometallurgiya is the property of International Association Welding (Paton Publishing House) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2018
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17. ПРИМЕНЕНИЕ ЭЛЕКТРОННО-ЛУЧЕВОЙ ПЛАВКИ ДЛЯ ПОЛУЧЕНИЯ СПЛАВОВ ЦИРКОНИЯ В УКРАИНЕ
- Author
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Ладохин, С. В. and Вахрушева, В. С.
- Abstract
Copyright of Electrometallurgy Today / Sovremennaya Elektrometallurgiya is the property of International Association Welding (Paton Publishing House) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2018
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18. ОСОБЕННОСТИ ПОЛ УЧЕНИЯ КРУПН ЫХ СЛИТКОВ АЛЮМИНИДОВ ТИТАНА В ЭЛЕКТ РОННО-ЛУЧЕВ ЫХ УСТАНОВКАХ
- Author
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Ахонин, С. В., Северин, А. Ю., Березос, В. А., Пикулин, А. Н., and Ерохин, А. Г.
- Abstract
Copyright of Electrometallurgy Today / Sovremennaya Elektrometallurgiya is the property of International Association Welding (Paton Publishing House) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2018
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19. ПОЛ УЧЕНИЕ ВЫСОКОП РОЧНОГО ТИТАН ОВОГО СПЛАВА ВТ22 СПОСОБОМ ЭЛЕКТ РОННО -ЛУЧЕВО Й ПЛАВКИ
- Author
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Ахонин, С. В., Березос, В. А., Пикулин, А. Н., Северин, А. Ю., Шваб, С. Л., and Ерохин, А. Г.
- Abstract
Copyright of Electrometallurgy Today / Sovremennaya Elektrometallurgiya is the property of International Association Welding (Paton Publishing House) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2018
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20. ТЕХНОЛОГИЧЕСКИЕ И МЕТАЛЛУРГИЧЕСКИЕ ОСОБЕННОСТИ ВЫПЛАВКИ СЛИТКОВ ТИТАНОВЫХ СПЛАВОВ В ЭЛЕКТРОШЛАКОВЫХ ПЕЧАХ КАМЕРНОГО ТИПА
- Author
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Протоковилов, И. В., Назарчук, А. Т., Петров, Д. А., and Порохонько, В. Б.
- Abstract
Copyright of Electrometallurgy Today / Sovremennaya Elektrometallurgiya is the property of International Association Welding (Paton Publishing House) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2018
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21. Features of formation of structure and properties of Zr-1Nb alloy when manufacturing fuel element shell tubes
- Author
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Sukhomlin, Georgiy and Dergach, Tatyana
- Subjects
сплав циркония ,слиток ,трубы ,твэл ,микроструктура ,специальные границы зерен ,свойства ,zirconium alloy ,ingot ,tubes ,fuel element shell ,microstructure ,special grain boundaries ,properties ,сплав цирконію ,злиток ,труби ,твел ,мікроструктура ,спеціальні границі зерен ,властивості ,УДК 621.039.539.67 - Abstract
Исследованы структура и свойства литого и горячедеформированного сплава Zr-1Nb и изготовленных из него опытных партий труб-оболочек тепловыделяющих элементов (твэл) для реакторов ВВЭР 1000 атомных электростанций. Показано, что удовлетворительная технологическая пластичность горячедеформированных передельных труб обеспечивается при высокотемпературном прессовании слитков с высокой степенью деформации. Впервые в мартенситных структурах сплава Zr-1Nb с гексагональной плотноупакованной решеткой установлено наличие специальных границ зерен в теории решеток совпадающих узлов. Изготовленные по разработанной технологии трубы-оболочки твэл сплава Zr-1Nb по основным качественным характеристикам соответствуют зарубежным аналогам, Досліджено структуру і властивості литого і гарячедеформованого сплаву Zr-1Nb і виготовлених з нього дослідних партій труб-оболонок тепловиділяючих елементів (твел) для реакторів ВВЕР 1000 атомних електростанцій. Показано, що задовільна технологічна пластичність гарячедеформованих переробних труб забезпечується при високотемпературному пресуванні злитків з високим ступенем деформації. Вперше у мартенситних структурах сплаву Zr-1Nb з гексагональною щільно впакованою граткою встановлено наявність спеціальних границь зерен у теорії ґраток співпадаючих вузлів. Виготовлені за розробленою технологією труби-оболонки твел зі сплаву Zr-1Nb за основними якісними характеристиками відповідають зарубіжним аналогам, Structure and properties of cast and hot-worked Zr-1Nb alloy and pilot batches of fuel element shell tubes for water-moderated water-cooled reactors (WWER 1000) of nuclear power plants manufactured from this alloy have been studied. It is shown that satisfactory processing ductility of hot-worked rolled tubes is formed during high-temperature extrusion at a high reduction rate. Presence of special grain boundaries in martensitic structures of Zr-1Nb alloy with a hexagonal close-packed lattice has been established for the first time in the theory of lattices of coinciding nodes. The fuel element shell tubes manufactured according to the developed technology are equal to foreign counterparts in terms of their basic quality characteristics
- Published
- 2019
22. Удосконалення технології виплавки зливків із нікелевих сплавів методом вакуумно-дугової переплавки
- Author
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Yefanov, V. S., Ovchynnykov, O. V., Dzhuhan, O. A., Tkachenko, S. M., and Zhdan, V. S.
- Subjects
metal melting ,шихта ,нікелевий сплав ,nickel alloy ,alloying element ,плавка ,структура ,smelting charge ,легуючий елемент ,відливок ,properties ,властивості ,ingot ,structure - Abstract
Purpose. Improvement of the technological modes for the melting of nickel-based cathodes of composition Ni−Cr−Al−Y in order to improve their quality, namely, reducing the total number of defects in the form of discontinuities, pores, non-melts and increasing the homogeneity of the structure and chemical composition. Methods. To prepare the smelting charge for melting, the raw materials were chopped to the required size and mixed, which made it possible to ensure uniform distribution of the alloying elements in the entire volume of the smelting charge. To obtain experimental ingots, a vacuum-arc furnace was used. The mass of smelting-charge loading per melting was 4 000…6 000 g. Testing of melting modes was carried out by experimental implementation of the process. The range of modes is as follows: I = 450...1 800A, U = 30...45 V, t = 25...35 min, preliminary creation of a vacuum of 1∙10-4 mbar. The operating fluid is Ag/He gas mixture (70/30), pressure 0.5 bar, temperature of chill mold heating − 250…800 °С, melt temperature before pouring − 1 400…1 700 °С. For a comprehensive assessment of the chemical composition, a study was conducted in two zones of ingot fragment, in the central part of the sample and on its surface. The chemical composition studies were performed using a multipurpose scanning electron microscope REM 106І equipped with a microanalysis system. Metallographic studies of the obtained structure of the ingot were carried out using optical and electronic microscopes. Results. It has been established that the use of vacuum-arc remelting process to produce nickel-based alloys using preparation methods of smelting-charge with various size and refining the melting process parameters allows to produce ingots with a minimum number of proper defects, with the formation of a uniform structure and uniform distribution of alloying elements in the entire alloy. Scientific novelty. The regularities of the influence of the technological parameters of the charge preparation and the melting process on the structure and properties of nickel-based superalloys are established. Practical significance. Practical use of the obtained results will significantly improve the homogeneity of ingots in the production of cathodes for coating, which in turn will have a positive effect on the quality of applied coatings and the total resource of parts., Аннотация. Цель исследования – усовершествование технологических режимов выплавки распыляемых катодов на основе никеля системы Ni−Cr−Al−Y с целью повышения их качества, а именно – уменьшение общего количества дефектов в виде несплошностей, пор, непроплавов, и повышения гомогенности структуры и химического состава. Методика. Для приготовления шихты под переплав исходные материалы измельчались до необходимого размера и тщательно перемешивались, что позволяло обеспечить равномерное распределение легирующих элементов во всем объеме шихты. Для получения опытных слитков использовали вакуумно-дуговую гарнисажную печь. Масса загрузки шихты на одну плавку составляла 4 000…6 000 г. Отработка режимов переплава проводилась путем экспериментальной реализации процесса. Диапазон режимов следующий: I = 450...1 800A, U = 30...45V, t = 25...35 мин., предварительное создание вакуума 1∙10-4 мбар, рабочая среда – смесь газов Ag/He (70/30), давление 0,5 бар, температура подогрева кокиля 250…800 °С, температура расплава перед заливкой 1 400…1 700 °С. Для всесторонней оценки химического состава проводили исследование в двух зонах фрагмента слитка, в центральной части образца и на его поверхности. Исследования химического состава проводили с применением многоцелевого растрового электронного микроскопа РЭМ 106І, оснащенного системой микроанализа. Металлографические исследования полученной структуры слитка проводилось с помощью оптического и электронного микроскопов. Результаты. Установлено, что использование вакуумно-дугового переплава для получения сплавов на основе никеля с использованием приемов приготовления шихты различной дисперсности и уточнением параметров технологического процесса плавки позволяют получать слитки с минимальным количеством характерных дефектов, с образованием однородной структуры и с равномерным распределением легирующих элементов во всем объеме сплава. Научная новизна. Установлены закономерности влияния технологических параметров подготовки шихты и процесса плавки на структуру и свойства жаропрочных сплавов на никелевой основе. Практическая значимость. Практическое использование полученных результатов позволит значительно повысить гомогенность и однородность слитков при производстве катодов для нанесения покрытий, что, в свою очередь, положительно скажется на качестве наносимых покрытий и общем ресурсе деталей., Анотація. Мета дослідження – удосконалення технологічних режимів виплавки катодів на основі нікелю системи Ni−Cr−Al−Y для підвищення їх якості, а саме − зменшення загальної кількості дефектів у вигляді несуцільностей, пор, непроплавів і підвищення гомогенності структури та хімічного складу. Методика. Для приготування шихти під переплавку вихідні матеріали подрібнювалися до необхідного розміру та ретельно перемішувалися, що дозволяло забезпечити рівномірний розподіл легуючих елементів у всьому об’ємі шихти. Для отримання дослідних зливків використовували вакуумно-дугову гарнісажну піч. Маса завантаження шихти на одну плавку становила 4 000...6 000 г. Відпрацювання режимів переплавки проводилося шляхом експериментальної реалізації процесу. Діапазон режимів такий: I = 450...1 800 A, U = 30...45 V, t = 25...35 хв, попередньо створювався вакуум 1∙10-4 мбар, робоче середовище − суміш газів Ag/He (70/30), тиск 0,5 бар, температура підігріву кокілю 250...800 °С, температура розплаву перед заливанням 1 400...1 700 °С. Для всебічного оцінювання хімічного складу проводили дослідження в двох зонах фрагменту відливка, в центральній частині зразка та на його поверхні. Досліджували хімічний склад із застосуванням багатоцільового растрового електронного мікроскопу РЕМ 106І, оснащеного системою мікроаналізу. Металографічні дослідження отриманої структури зливка проводилися за допомогою оптичного й електронного мікроскопів. Результати. Встановлено, що використання вакуумно-дугової переплавки для отримання сплавів на основі нікелю із застосуванням прийомів приготування шихти різної дисперсності і уточненням параметрів технологічного процесу плавки дозволяє отримувати зливки з мінімальною кількістю характерних дефектів, з утворенням однорідної структури і з рівномірним розподілом легуючих елементів у всьому об’ємі сплаву. Наукова новизна. Встановлено закономірності впливу технологічних параметрів підготовки шихти і процесу плавлення на структуру і властивості жароміцних сплавів на нікелевій основі. Практичне значення. Практичне використання отриманих результатів дозволить значно підвищити гомогенність і однорідність зливків у виробництві катодів для нанесення покриттів, що, у свою чергу, позитивно позначиться на якості покриттів та загальному ресурсі деталей.
- Published
- 2019
23. ИЗУЧЕНИЕ ЛИТЬЯ СПЛАВА Cr5Si3, ИССЛЕДОВАНИЕ ФИЗИКО-ХИМИЧЕСКИХ СВОЙСТВ СЛИТКА
- Subjects
металлографические исследования ,слиток ,микроструктура ,alloy ,microstructure ,ingot ,microhardness ,сплав ,микротвердость ,metallographic studies - Abstract
Рассматриваются результаты выплавки слитков сплава Cr5Si3. Приведены некоторые данные о физико-химических свойствах слитков., The article deals with the results of the smelting of ingots of the Cr5Si3 alloy. Some data on the physicochemical properties of the ingots are given., №1 (2018)
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- 2018
- Full Text
- View/download PDF
24. Effect of heat treatment conditions on electrical resistivity of 35KhGF molten steel
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Borovykh, M. A., Chikova, O. A., Tsepelev, V. S., and V’yukhin, V. V.
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Materials science ,STEEL ,Metals and Alloys ,Thermodynamics ,Atmospheric temperature range ,Microstructure ,law.invention ,CRYSTAL STRUCTURE ,law ,Electrical resistivity and conductivity ,MICROIN-HOMOGENEITY ,TEMPERATURE COEFFICIENT OF RESISTANCE ,Grain boundary ,Crystallite ,Crystallization ,Ingot ,MICROSTRUCTURE ,Temperature coefficient ,MELT RESISTIVITY - Abstract
The authors have studied the effect of the grain structure, crystal structure and defects of 35KhGF steel samples on the character of temperature dependence of the melt specific electrical resistance at temperatures of 1450–1720 °C. Grain and crystalline structures changed as a result of heat treatment - normalization and tempering. The peculiarities of grain and crystalline structures, the defects were recognized according to the results of metallographic study. The metallographic study was carried out by diffraction of backscattered electrons-EBSD analysis. Scanning areas were chosen with the inclusion of defects in metal of technological origin, namely, microscopic discontinuities filled with gas or slag. The results of EBSD analysis are drawn as IPF-patterns; they show the texture state of the samples using the color assignment method. The microstructure of a 35KhGF steel sample after normalization at 910 °C has the smallest crystallites (of the order of 1 μm) and the largest extent of the grain boundaries. All samples have defects – discontinuities of the order of 1 μm in size. Specific electrical resistance of molten 35KhGF steel samples was measured by the method of rotating magnetic field in heating mode and subsequent cooling. For samples preliminarily normalized at 910 °C, a discrepancy in the temperature dependences of resistivity and an irreversible decrease in the resistivity temperature coefficient were observed in cooling mode of the melt. The discrepancy between the temperature dependences of the electrical resistivity and the irreversible decrease in the temperature coefficient of the resistivity was analyzed on the basis of the microinhomogeneous structure concepts of metallic melts and the pheno menon of metallurgical heredity. According to the notion of the microheterogeneous structure of metallic melts, the melting of a multiphase steel ingot does not immediately produce a homogeneous solution of the alloying elements in the iron at the atomic level, and a chemically microinhomogeneous state is maintained in a certain temperature range. Looking at the branching of the temperature dependences of the electrical resistivity, the transition of the melt into the state of true solution occurs only near the temperature T* = 1640 °C. The value of temperature T* according to the notion of the structural metallurgical heredity phenomenon depends on microstructure, phase composition and crystalline structure of the initial sample. The presence of discontinuities leads to appearance of an excess volume of melt during metal melting, which is partially retained during cooling and crystallization. In this case, the temperature coefficient of the resistivity in cooling mode is close to zero in absolute value, even at ingot cooling rates of the order of 10 °C/s the crystallization conditions change, in particular, the metal’s propensity to amorphization increases. © 2018, National University of Science and Technology MISIS. All rights reserved.
- Published
- 2018
25. Modernization of equipment and industrial implementation of resource-saving forging processes in the conditions of LLC 'Dnepropress Steel'
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формоизменение ,слиток ,протяжка ,forging ,ingot ,shaping ,deformation ,broaching ,деформация - Abstract
В статье рассмотрен процесс модернизации кузнечного оборудования и внедрения ресурсосберегающих технологий ковки на предприятии ООО "Днепропресс Сталь", которое является металлургическим заводом с полным циклом производства поковок из нержавеющих, легированных, жаропрочных сталей и сплавов от выплавки до готового изделия. На этом предприятии была проведена работа по сертификации ISO 9001:20015 системы менеджмента качества, а также ведется работа по разработке оптимальных режимов деформации при ковке поковок с целью получения высокого качества продукции. В частности, определено формоизменение при ковке при помощи компьютерного моделирования, получены данные по формоизменению прибыльной части слитка и разработаны рекомендации по оптимизации схем деформации для ковки слитков с уменьшенной прибыльной частью. The article describes the process of modernization of forging equipment and the introduction of resource-saving forging technologies at the company Dnepropress Steel LLC, which is a metallurgical plant with a full cycle of production of forgings from stainless, alloyed, heat-resistant steels and alloys from smelting to finished products. At this company, work was carried out on the certification of ISO 9001:20015 quality management system, as well as work is underway to develop optimal deformation modes for forging forgings in order to obtain high quality products. Under the conditions of the forge-thermal workshop of Dnipropress Steel LLC, it is possible to use modern forging technologies that are based on obtaining high quality forgings by developing a rational mode of plastic deformation during free forging. In particular, the form change during forging was determined using computer simulation, data was obtained on how to change the profitable part of an ingot, and recommendations were developed on how to optimize deformation schemes for forging ingots with a reduced profit part.
- Published
- 2018
26. Continuous casting and deformation installation for the production of steel plates for welded pipes. Report 1
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Lekhov, O. S. and Mikhalev, A. V.
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STRAIN ,Materials science ,STEEL ,Metals and Alloys ,CONTINUOUS CASTING ,Young's modulus ,Bending ,Strain rate ,Finite element method ,Continuous casting ,Physics::Fluid Dynamics ,COAT WITH A LIQUID PHASE ,symbols.namesake ,Casting (metalworking) ,DEFORMATION ,EPURE ,symbols ,Deformation (engineering) ,Ingot ,Composite material ,INSTALLATION - Abstract
The shortcomings of modern technology of thick-plate rolling, leading to the problems in production of welded pipes, are described. Advantages of thin slab casting technology are indicated, in which casting and reduction of a billet with a liquid phase are combined. The design of the combined continuous casting and deformation installation is described and the technology of steel plate production for welded pipes is provided. The main task of the article was to determine the stress-strain state of metal during formation of a strip from the ingot steel coat with a liquid phase by the coat with a liquid phase narrow walls bending. Computational experiment based on the solution of continuum mechanics task by means of the finite element method was used as a method of investigation. For calculations, a grid of finite elements was taken for a quarter of the model and a coat narrow wall with a facet length of 0.5 mm. The elastic-plastic contact task is solved considering large displacements and deformations, and a stress-strain state during formation of a strip in a zone of bending of a coat with liquid phase narrow walls is determined. The calculation was carried out in a flat setting (flat deformed state). The initial data for the solution of the task using advanced ANSYS software are presented. The task statement and the boundary conditions are described. Dependences for calculation of the modulus of elasticity and plastic deformation resistance on temperature, strain degree and strain rate are presented. Epures of displacements, stresses and deformations of metal in the bending zone of a coat with a liquid phase narrow wall are presented. The regularities of distribution of tensile stresses along the outer surface and along the thickness of a coat narrow wall with a liquid phase are described as well as the ways of reducing tensile stresses on the side surfaces of a coat with a liquid phase. © 2017, National University of Science and Technology MISIS. All rights reserved.
- Published
- 2017
27. Influence of the velocity mode upon alternations in ingot’s stressed state
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Loza, A. V., Chigarev, V. V., Rassokhin, D. A., and Shishkin, V. V.
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continuous casting ,ingot ,technology casting speed ,yield point ,high temperatures ,stress ,strain ,deformation ,computer simulation ,безперервне литво ,заготовки ,технологія безперервного литва ,швидкість литва ,границя текучості ,високі температури ,напруги ,деформації ,моделювання ,непрерывная разливка ,технология непрерывного литья ,скорость разливки ,предел текучести ,высокие температуры ,напряжения ,деформации ,моделирование - Abstract
У роботі виконано аналітичне дослідження впливу швидкісного режиму безперервного литва зливків прямокутного перетину на змінення їх пружно-деформований стан у період закінчення литва, В работе выполнено аналитическое исследование влияния скоростного режима непрерывного литья слитков прямоугольного сечения на их напряженно-деформированное состояние в период окончания разливки. Скоростной режим оказывает существенное влияние на образование дефектов в литой заготовке. Возникающие напряжения могут вызывать появление трещин и остаточных деформаций, которые ухудшают качество товарной продукции, The operation mode of continuous casting machines has a great influence on internal and surface defects of cast ingots. When a solidifying ingot passes along the process line of the continuous casting machine stress and deformations arise in its solidifying skin, it leading to cracks formation and determining the quality of production. The contemporary investigations are devoted mainly to the existing operation modes of continuous casting, in which the field of temperature distribution in ingot is stationary in the system of coordinates, linked with the crystallizer. Little attention has so far been paid to transition periods, due to difficulties of investigation and description of the processes happening during these periods. During the period of completion of continuous casting the rate of ingot’s drawing is reduced to the minimal possible value, thus ensuring trouble-free operation of continuous casting machines, the tail part of slabs being cooled down in a greater degree than the bulk of slabs. At this temperature reduction in the tail part the metal gets into the area of resilience, it greatly increasing the likeness of surface cracks formation and other defects. Due to this reason it is very important to know the ingot’s stress in its tail part. This problem can be solved by means of a mathematical model. This work presents a numerical simulation of a stressed state of a steel slab on a horizontal section of a curved continuous caster. The data, regarding temperature and stresses distribution were obtained for the surface of the bulk of continuously cast ingot and its tail part. The value of stress in ingot’s tail part can exceed its yield point, resulting in appearance of residual deformations and changes in ingot’s width. Unfavourable distribution of temperature stresses can be altered by correction of cooling in the tail part of continuously cast ingot
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- 2015
28. The studying of the combined effect of REM and time-temperature melt processing regularities of ingot EK77
- Author
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Zagorodnova, L. I., Zhilyakov, A, Yu., and Gudov, A. G.
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REM ,INGOT ,ОБРАБОТКА РАСПЛАВОВ ,СЛИТОК ,MELT PROCESSING ,РЗМ - Abstract
The effect of preparation of alloy EK77 in liquid condition before crystallization on the characteristics of its cast structure is studied. The liquidus and solidus temperatures of alloy EK77 are determined. The temperature -time treatment of the melt and additives of rare earth metals are shown to influence on the structure formation features of the alloy EK77. Проведено исследование влияния подготовки сплава ЭК77 в жидком состоянии перед кристаллизацией на характеристики его литой, структуры. Определены температуры ликвидус и солидус для сплава ЭК77. Установлено влияние термо-временной обработки расплава, добавок РЗМ на особенности формирования структуры слитка сплава ЭК77.
- Published
- 2015
29. Розробка пристроїв і систем вирощування злитків арсеніду галію для виробів мікро, нано електроніки та фотовольтаіки
- Author
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Oksanich, A.P., Pritchin, S.E., and Terban, V.A.
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wafer ,внутрішні напруження ,температурный градиент ,gallium arsenide ,диаметр ,внутренние напряжения ,температурний градієнт ,арсенид галлия ,621.317.799 ,слиток ,арсенід галію ,пластина ,ingot ,діаметр ,the temperature gradient ,the internal stresses ,злиток ,the diameter - Abstract
У роботі представлені результати розробки системи керування процесом вирощування зливків арсеніду галія, теплового вузла, методу й системи виміру внутрішніх напружень у пластинах арсеніду галію. Представлені в роботі технічні рішення дозволили одержати злитки кремнію діаметром 100 мм. с рухливістю, см² В⁻¹ с⁻¹ - 2500 ÷ 3500; концентрацій носіїв заряду, см⁻³ - 5×10¹⁷ ÷ 5×10¹⁸; густиною дислокацій, см⁻² - до 8×10⁴. Gallium arsenide is a perspective semiconductor, the need for which is constantly in-creasing. This is associated with the development of electronic components operating in excess of the high frequency range and development of terrestrial photovoltaics based on gallium arsenide solar cells. Increase in diameter of grown ingots leads to a deterioration in their performance, which is caused by the imperfection of growing technology. The paper presents the results of the development of systems and devices which help to improve existing technology to produce GaAs ingots and wafers with a diameter of 100 mm with the best technical parameters. Developed a system to manage growing GaAs ingot. As a sensor of diameter ingot it uses a weighting method provides a measurement error in the process of growing ± 1,0 mm. The system allows to grow GaAs ingots with an error of ± 2 mm. For the formation of temperature gradients developed thermal unit, which provides a gradient of 51 .. 53 K/cm in growing of ingots with diameter of 100 mm. For adjusting the process parameters were developed measuring device of the internal stresses that are generated in the ingot during the growth of the GaAs ingot. Presented in paper technical solutions provided a silicon ingot with a diameter of 100 mm. with mobility, cm² V⁻¹ s⁻¹ - 2500 ÷ 3500, the charge carrier density, cm⁻³ - 5×10¹⁷ ÷ 5×10¹⁸; dislocation density, cm⁻² - to 8×10⁴. В работе представлены результаты разработки системы управления процессом выращивания слитков арсенида галлия, теплового узла, метода и системы измерения внутренних напряжений в пластинах арсенида галлия. Представленные в работе технические решения позволили получить слитки кремния диаметром 100 мм. подвижностью, см² В⁻¹ с⁻¹ - 2500 ÷ 3500; концентраций носителей заряда, см⁻³ - 5×10¹⁷ ÷ 5×10¹⁸; плотность дислокаций, см⁻² - до 8×10⁴.
- Published
- 2013
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