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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">blackmet</journal-id><journal-title-group><journal-title xml:lang="ru">Известия высших учебных заведений. Черная Металлургия</journal-title><trans-title-group xml:lang="en"><trans-title>Izvestiya. Ferrous Metallurgy</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0368-0797</issn><issn pub-type="epub">2410-2091</issn><publisher><publisher-name>National University of Science and Technology "MISIS"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.17073/0368-0797-2024-4-409-416</article-id><article-id custom-type="elpub" pub-id-type="custom">blackmet-2763</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>МАТЕРИАЛОВЕДЕНИЕ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>MATERIAL SCIENCE</subject></subj-group></article-categories><title-group><article-title>Исследование малоцикловой усталости зон сварного соединения стали класса прочности X70</article-title><trans-title-group xml:lang="en"><trans-title>Low-cycle fatigue of welded joint from steel of X70 strength class</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Галкин</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Galkin</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Андрей Александрович Галкин, аспирант кафедры «Технология и оборудование машиностроения»</p><p>Россия, 603022, Нижний Новгород, ул. Минина, 24</p></bio><bio xml:lang="en"><p>Andrei A. Galkin, Postgraduate of the Chair “Technology and Equipment Engineering”</p><p>24 Minina Str., Nizhny Novgorod 603022, Russian Federation</p></bio><email xlink:type="simple">galkinnnov@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-4300-6659</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Кабалдин</surname><given-names>Ю. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Kabaldin</surname><given-names>Yu. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Юрий Георгиевич Кабалдин, д.т.н., профессор кафедры «Технология и оборудование машиностроения»</p><p>Россия, 603022, Нижний Новгород, ул. Минина, 24</p></bio><bio xml:lang="en"><p>Yurii G. Kabaldin, Dr. Sci. (Eng.), Prof. of the Chair “Technology and Equipment Engineering”</p><p>24 Minina Str., Nizhny Novgorod 603022, Russian Federation</p></bio><email xlink:type="simple">uru.40@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Мордовина</surname><given-names>Ю. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Mordovina</surname><given-names>Yu. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Юлия Сергеевна Мордовина, инженер кафедры «Технология и оборудование машиностроения», аспирант</p><p>Россия, 603022, Нижний Новгород, ул. Минина, 24</p></bio><bio xml:lang="en"><p>Yuliya S. Mordovina, Engineer of the Chair “Technology and Equipment Engineering”, Postgraduate</p><p>24 Minina Str., Nizhny Novgorod 603022, Russian Federation</p></bio><email xlink:type="simple">ips4@nntu.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Аносов</surname><given-names>М. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Anosov</surname><given-names>M. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Максим Сергеевич Аносов, к.т.н., доцент кафедры «Технология и оборудование машиностроения»</p><p>Россия, 603022, Нижний Новгород, ул. Минина, 24</p></bio><bio xml:lang="en"><p>Maksim S. Anosov, Cand. Sci. (Eng.), Assist. Prof. of the Chair “Techno­logy and Equipment Engineering”</p><p>24 Minina Str., Nizhny Novgorod 603022, Russian Federation</p></bio><email xlink:type="simple">anosov-maksim@list.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Нижегородский государственный технический университет им. Р.Е. Алексеева</institution><country>Россия</country></aff><aff xml:lang="en"><institution>R.E. Alekseev Nizhny Novgorod State Technical University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>31</day><month>08</month><year>2024</year></pub-date><volume>67</volume><issue>4</issue><fpage>409</fpage><lpage>416</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Галкин А.А., Кабалдин Ю.Г., Мордовина Ю.С., Аносов М.С., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Галкин А.А., Кабалдин Ю.Г., Мордовина Ю.С., Аносов М.С.</copyright-holder><copyright-holder xml:lang="en">Galkin A.A., Kabaldin Y.G., Mordovina Y.S., Anosov M.S.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://fermet.misis.ru/jour/article/view/2763">https://fermet.misis.ru/jour/article/view/2763</self-uri><abstract><p>Широкое применение в области тяжелого машиностроения получили стали класса прочности X70. Одним из наиболее важных вопросов при выборе стали для конструкций является ее поведение при циклических нагрузках. В научной литературе трудно найти описание поведения всех зон сварного соединения при усталости. Поэтому целью данного исследования является определение характеристик усталостной прочности сварных соединений из российского аналога стали S690QL с фиксацией параметров акустической и магнитной дефектоскопии для их применения при диагностике конструкций во время эксплуатации. В качестве объекта исследования были взяты образцы из отечественной стали класса прочности X70. Химический состав определялся с помощью оптико-эмиссионной спектрометрии. Подготовка шлифов для микроструктурного анализа проводилась по стандартной методике с травлением в нитале. Испытание на усталость проводилось на специализированном стенде. Для акустических измерений применяли акустический комплекс АИС НРК-3, в качестве информативного параметра использовался акустический параметр D. Для оценки магнитных характеристик использовался коэрцитиметр МА-412ММ. Оценивались остаточная намагниченность Br , коэрцитивная сила Hc , отношение Hc /Br . Наименьшее количество циклов соответствует зоне наплавленного металла. Снижение амплитуды показало значительный разбег в поведении материала в зависимости от зоны соединения. Однако кривые для зоны термического влияния (ЗТВ) и для наплавленного металла практически совпадают. При этом ЗТВ в меньшей степени отличается от основного металла, чем зона наплавленного металла. График акустического параметра по своему виду является обратным по отношению к графику магнитных характеристик. Так, для акустического параметра в зависимости от наработки имеется минимум, а для магнитных характеристик – максимум. Но для обоих графиков экстремумом является точка, соответствующая наработке 0,6.</p></abstract><trans-abstract xml:lang="en"><p>Steels of X70 strength class are particularly widely used in the field of heavy engineering. One of the most important issues when choosing steel for structures is its behavior under cyclic loads. It is difficult to find a description of the behavior of all zones of the welded joint under fatigue. The purpose of this study was to determine the fatigue characteristics of welded joints made of the Russian analogue of S690QL steel with fixation of acoustic and magnetic parameters for their use in the diagnosis. The objects of the study were the samples from domestic steel of X70 strength class. The chemical composition was determined using optical emission spectrometry. The grinds for microstructural analysis were prepared according to the standard technique with etching in the metal. The fatigue test was carried out on a specialized test bench. The authors used the acoustic system AIS NRK-3 for acoustic measurements and the acoustic parameter D – as an informative parameter. A MA-412MM coercitimeter was applied to evalua­te the magnetic characteristics. The following were evaluated: residual magnetization Br , coercive force Hc , Hc/Br ratio. The smallest number of cycles corresponds to the deposited metal zone. The decrease in amplitude showed a significant variation in the behavior of the material depending on the junction zone. However, the curves for heat affected zone (HAZ) and the deposited metal are practically the same. HAZ differs to a lesser extent from the base metal than the deposited metal zone. The graph of the acoustic parameter in its form is the reverse of the magnetic characteristics graph. Thus, there is a minimum for the acoustic parameter, depending on the operating time, and a maximum for the magnetic characteristics. For both graphs, the extremum is the point corresponding to the operating time of 0.6.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>усталость</kwd><kwd>малоцикловая усталость</kwd><kwd>сварные соединения</kwd><kwd>акустический параметр</kwd><kwd>коэрцитивная сила</kwd><kwd>остаточная намагниченность</kwd><kwd>усталость сварных соединений</kwd><kwd>класс прочности X70</kwd></kwd-group><kwd-group xml:lang="en"><kwd>fatigue</kwd><kwd>low-cycle fatigue</kwd><kwd>welded joint</kwd><kwd>acoustic parameter</kwd><kwd>coercive force</kwd><kwd>residual magnetization</kwd><kwd>fatigue of welded joints</kwd><kwd>X70 strength class</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Nikolić R., Arsic D., Lazić V. Application of the S690QL class steel in responsible welded structures. 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