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<article 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" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="other" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Frontier Materials &amp; Technologies</journal-id><journal-title-group><journal-title xml:lang="en">Frontier Materials &amp; Technologies</journal-title><trans-title-group xml:lang="ru"><trans-title>Frontier Materials &amp; Technologies</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2782-4039</issn><issn publication-format="electronic">2782-6074</issn><publisher><publisher-name xml:lang="en">Togliatti State University</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">822</article-id><article-id pub-id-type="doi">10.18323/2782-4039-2023-1-69-81</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Статьи</subject></subj-group><subj-group subj-group-type="article-type"><subject></subject></subj-group></article-categories><title-group><article-title xml:lang="en">Fatigue strength of 30ХГСА–40ХМФА welded joints produced by rotary friction welding</article-title><trans-title-group xml:lang="ru"><trans-title>Усталостная прочность сварных соединений сталей 30ХГСА–40ХМФА, полученных ротационной сваркой трением</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4571-2410</contrib-id><name-alternatives><name xml:lang="en"><surname>Priymak</surname><given-names>Elena Yu.</given-names></name><name xml:lang="ru"><surname>Приймак</surname><given-names>Елена Юрьевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>PhD (Engineering), Head of the Laboratory of Metal Science and Heat Treatment, assistant professor of Chair of Materials Science and Technology of Materials</p></bio><bio xml:lang="ru"><p>кандидат технических наук, заведующий лабораторией металловедения и термической обработки, доцент кафедры материаловедения и технологии материалов</p></bio><email>elena-pijjmak@yandex.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kuzmina</surname><given-names>Elena A.</given-names></name><name xml:lang="ru"><surname>Кузьмина</surname><given-names>Елена Александровна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Head of Technical Department</p></bio><bio xml:lang="ru"><p>начальник технического отдела </p></bio><email>kuzmina0902@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-3542-6242</contrib-id><name-alternatives><name xml:lang="en"><surname>Gladkovskii</surname><given-names>Sergey V.</given-names></name><name xml:lang="ru"><surname>Гладковский</surname><given-names>Сергей Викторович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Doctor of Sciences (Engineering), chief researcher</p></bio><bio xml:lang="ru"><p>доктор технических наук, главный научный сотрудник</p></bio><email>gsv@imach.uran.ru</email><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-6508-6859</contrib-id><name-alternatives><name xml:lang="en"><surname>Vichuzhanin</surname><given-names>Dmitry I.</given-names></name><name xml:lang="ru"><surname>Вичужанин</surname><given-names>Дмитрий Иванович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>PhD (Engineering), senior researcher</p></bio><bio xml:lang="ru"><p>кандидат технических наук, старший научный сотрудник</p></bio><email>mmm@imach.uran.ru</email><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4955-6435</contrib-id><name-alternatives><name xml:lang="en"><surname>Veselova</surname><given-names>Valeria E.</given-names></name><name xml:lang="ru"><surname>Веселова</surname><given-names>Валерия Евгеньевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>junior researcher</p></bio><bio xml:lang="ru"><p>младший научный сотрудник</p></bio><email>veselova@imach.uran.ru</email><xref ref-type="aff" rid="aff3"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">ZBO Drill Industries, Inc., Orenburg</institution></aff><aff><institution xml:lang="ru">АО «Завод бурового оборудования», Оренбург</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Orenburg State University, Orenburg</institution></aff><aff><institution xml:lang="ru">Оренбургский государственный университет, Оренбург</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">Institute of Engineering Science of Ural Branch of the Russian Academy of Sciences, Yekaterinburg</institution></aff><aff><institution xml:lang="ru">Институт машиноведения имени Э.С. Горкунова УрО РАН, Екатеринбург</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2023-03-31" publication-format="electronic"><day>31</day><month>03</month><year>2023</year></pub-date><issue>1</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>69</fpage><lpage>81</lpage><history><date date-type="received" iso-8601-date="2023-03-31"><day>31</day><month>03</month><year>2023</year></date><date date-type="accepted" iso-8601-date="2023-03-31"><day>31</day><month>03</month><year>2023</year></date></history><permissions><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/></permissions><self-uri xlink:href="https://vektornaukitech.ru/jour/article/view/822">https://vektornaukitech.ru/jour/article/view/822</self-uri><abstract xml:lang="en"><p>Rotary friction welding (RFW) is used in the production of drill pipes for solid mineral prospecting. The need for the creation of the lightened drill strings for high-speed diamond drilling of ultradeep wells dictates the necessity of a greater focus on the study of a weld zone and setting the RFW technological parameters. This paper presents the results of experimental studies of a welded joint of a drill pipe of the H standard size according to ISO 10097, made of the 30ХГСА (pipe body) and 40ХМФА (tool joint) steels under the cyclic loads. The authors evaluated the influence of the force applied to the workpieces in the process of friction of the contacting surfaces (force during heating), and postweld tempering at a temperature of 550 °С on the cyclic life of welded joints, under the conditions of alternate tension-compression at the cycle amplitude stress of ±420 MPa. The study determined that with an increase in the force during heating, the microstructure changes occur in the zone of thermomechanical influence, contributing to an increase in the fatigue strength of welded joints. The authors identified the negative effect of postweld tempering on the fatigue strength of welded joints, which is expressed in the decrease in the number of cycles before failure by 15–40 %, depending on the magnitude of the force during heating. The optimal RFW mode of the specified combination of steels is determined, which provides the largest number of cycles before failure: the force during heating (at friction) <italic>F<sub>h</sub></italic>=120 kN, forging force <italic>F<sub>for</sub></italic>=160 kN, rotational frequency during heating <italic>n</italic>=800 Rpm, and upset during heating <italic>l</italic>=8 mm. A series of fatigue tests have been carried out at various values of the cycle amplitude stress of the welded joint produced at the optimal mode and the 30ХГСА steel base metal; limited endurance curves have been plotted. It is shown that the differences in the limited endurance curves of the pipe body material (30ХГСА steel) and the welded joint are insignificant. The obtained results are supplemented by the microhardness measurement data and fractographs of fractured samples, revealing the mechanism of crack propagation under the cyclic loads.</p></abstract><trans-abstract xml:lang="ru"><p>Ротационная сварка трением (РСТ) используется при производстве бурильных труб для геологоразведки на твердые полезные ископаемые. Потребность в создании облегченных колонн бурильных труб для высокоскоростного алмазного бурения сверхглубоких скважин диктует необходимость более пристального внимания к изучению зоны сварного шва и назначению технологических параметров РСТ. В работе приведены результаты экспериментальных исследований сварного соединения бурильной трубы типоразмера H по ISO 10097 из сталей 30ХГСА (тело трубы) и 40ХМФА (замковая часть) в условиях воздействия циклических нагрузок. Оценивалось влияние силы, прикладываемой к заготовкам в процессе трения соприкасающихся поверхностей (силы при нагреве), и послесварочного отпуска при температуре 550 °С на циклическую долговечность сварных соединений в условиях знакопеременного растяжения-сжатия при напряжении амплитуды цикла ±420 МПа. Установлено, что с увеличением силы при нагреве в зоне термомеханического влияния происходят изменения микроструктуры, способствующие повышению усталостной прочности сварных соединений. Выявлено негативное влияние послесварочного отпуска на усталостную прочность сварных соединений, выражающееся в снижении количества циклов до разрушения на 15–40 % в зависимости от величины силы при нагреве. Определен оптимальный режим РСТ указанного сочетания сталей, обеспечивающий наибольшее количество циклов до разрушения: сила при нагреве (при трении) <italic>F</italic><sub>н</sub>=120 кН, сила проковки <italic>F</italic><sub>пp</sub>=160 кН, частота вращения при нагреве <italic>n</italic>=800 об/мин и осадка при нагреве <italic>l</italic>=8 мм. Проведена серия усталостных испытаний при различных значениях напряжения амплитуды цикла сварного соединения, полученного на оптимальном режиме, и основного металла стали 30ХГСА; построены кривые ограниченной выносливости. Показано, что различия в кривых ограниченной выносливости материала тела трубы (сталь 30ХГСА) и сварного соединения незначительны. Полученные результаты дополнены данными измерений микротвердости и фрактограммами разрушенных образцов, раскрывающими механизм распространения трещин в условиях воздействия циклических нагрузок.</p></trans-abstract><kwd-group xml:lang="en"><kwd>rotary friction welding</kwd><kwd>drill pipes</kwd><kwd>welded joint</kwd><kwd>fatigue strength</kwd><kwd>limited endurance curve</kwd><kwd>30ХГСА steel</kwd><kwd>40ХМФА steel</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>ротационная сварка трением</kwd><kwd>бурильные трубы</kwd><kwd>сварное соединение</kwd><kwd>усталостная прочность</kwd><kwd>кривая ограниченной выносливости</kwd><kwd>сталь 30ХГСА</kwd><kwd>сталь 40ХМФА</kwd></kwd-group><funding-group><funding-statement xml:lang="en">The reported study was funded by RFBR according to the research project No. 20-38-90032. To perform mechanical tests, the equipment of the “Plastometry” Core Facility Center of Institute of Engineering Science of the UB RAS was used.</funding-statement><funding-statement xml:lang="ru">Исследование выполнено при финансовой поддержке РФФИ в рамках научного проекта № 20-38-90032. При проведении механических испытаний использовалось оборудование, входящее в состав ЦКП «Пластометрия» Института машиноведения имени Э.С. Горкунова УрО РАН.</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Emre H.E., Kaçar R. Effect of Post Weld Heat Treatment Process on Microstructure and Mechanical Properties of Friction Welded Dissimilar Drill Pipe. Materials Research, 2015, vol. 18, no. 3, pp. 503–508. DOI: 10.1590/1516-1439.308114.</mixed-citation><mixed-citation xml:lang="ru">Emre H.E., Kaçar R. 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