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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="research-article" 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">937</article-id><article-id pub-id-type="doi">10.18323/2782-4039-2024-2-68-3</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>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Low-cycle fatigue of 10 % Cr steel with high boron content at room temperature</article-title><trans-title-group xml:lang="ru"><trans-title>Малоцикловая усталость 10 % Cr стали с высоким содержанием бора при комнатной температуре</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0008-8069-7376</contrib-id><name-alternatives><name xml:lang="en"><surname>Brazhnikov</surname><given-names>Ivan S.</given-names></name><name xml:lang="ru"><surname>Бражников</surname><given-names>Иван Сергеевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>engineer of the Joint Research Center of Belgorod State National Research University “Technology and Materials”</p></bio><bio xml:lang="ru"><p>инженер Центра коллективного пользования «Технологии и Материалы НИУ "БелГУ"»</p></bio><email>1216318@bsu.edu.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-4031-463X</contrib-id><name-alternatives><name xml:lang="en"><surname>Fedoseeva</surname><given-names>Alexandra E.</given-names></name><name xml:lang="ru"><surname>Федосеева</surname><given-names>Александра Эдуардовна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>PhD (Engineering), senior researcher of the Laboratory of Mechanical Properties of Nanostructured Materials and Superalloys</p></bio><bio xml:lang="ru"><p>кандидат технических наук, старший научный сотрудник лаборатории механических свойств наноструктурных и жаропрочных материалов</p></bio><email>fedoseeva@bsu.edu.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Belgorod State National Research University</institution></aff><aff><institution xml:lang="ru">Белгородский государственный национальный исследовательский университет</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-06-28" publication-format="electronic"><day>28</day><month>06</month><year>2024</year></pub-date><issue>2</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>33</fpage><lpage>42</lpage><history><date date-type="received" iso-8601-date="2024-06-28"><day>28</day><month>06</month><year>2024</year></date><date date-type="accepted" iso-8601-date="2024-06-28"><day>28</day><month>06</month><year>2024</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2024, Brazhnikov I.S., Fedoseeva A.E.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2024, Бражников И.С., Федосеева А.Э.</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="en">Brazhnikov I.S., Fedoseeva A.E.</copyright-holder><copyright-holder xml:lang="ru">Бражников И.С., Федосеева А.Э.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://vektornaukitech.ru/jour/article/view/937">https://vektornaukitech.ru/jour/article/view/937</self-uri><abstract xml:lang="en"><p>High-chromium martensitic steels are a promising material for the production of elements of boilers and steam pipelines, as well as blades and rotors of steam turbines for new coal-burning thermal generating units. The use of such materials will give an opportunity for the transition to ultra-supercritical steam parameters (temperature of 600–620 °C and pressure of 25–30 MPa), which will allow increasing the efficiency of generating units to 45 %. Modifications of the chemical composition of high-chromium steels have led to significant improvements of high-temperature properties such as 100,000 h creep strength and 1 % creep limit, while resistance to softening due to low-cycle fatigue remains understudied in this field. This work covers the study of low-cycle fatigue at room temperature with different amplitudes of deformation of martensitic high-chromium 10%Cr–3%Co–2%W–0.5%Mo–0.2%Cu–0.2%Re–0.003%N–0.01%B steel. The steel was pre-subjected to normalizing at 1050 °С followed by tempering at 770 °С. After heat treatment, the steel structure was a tempered martensitic lath structure stabilised by the particles of secondary phases of M<sub>23</sub>C<sub>6</sub> carbides, NbX carbonitrides, and M<sub>6</sub>C carbides. The average width of martensite laths was 380 nm, and the dislocation density was 1.4×10<sup>14</sup> m<sup>−2</sup>. At low-cycle fatigue, with an increase in the strain amplitude from 0.2 to 1 %, the number of cycles before failure significantly decreases, and the value of plastic deformation in the middle of the number of loading cycles significantly increases. Maximum softening (18 %) is observed at a strain amplitude of 1 % in the middle of the number of loading cycles. In general, the steel structure after low-cycle fatigue tests does not undergo significant changes: the width of the laths increases by 18 % at a strain amplitude of more than 0.3 %, while the dislocation density remains at a rather high level (about 10<sup>14</sup> m<sup>−2</sup>) at all strain amplitudes.</p></abstract><trans-abstract xml:lang="ru"><p>Высокохромистые стали мартенситного класса являются перспективным материалом для изготовления элементов котлов и паропроводов, а также лопаток и роторов паровых турбин новых энергоблоков тепловых электростанций, работающих на угле. Использование таких материалов даст возможность осуществить переход на суперсверхкритические параметры пара (температура 600–620 °С и давление 25–30 МПа), что позволит увеличить КПД энергоблоков до 45 %. Модификации химического состава высокохромистых сталей привели к существенному повышению жаропрочных характеристик, таких как предел длительной прочности – до 100 000 ч и предел ползучести – до 1 % на базе 100 000 ч, в то время как сопротивление разупрочнению в результате малоцикловой усталости остается недостаточно изученным в данной области. Настоящая работа посвящена исследованию малоцикловой усталости при комнатной температуре с различными амплитудами деформации высокохромистой стали мартенситного класса 10%Cr–3%Сo–2%W–0,5%Mo–0,2%Cu–0,2%Re–0,003%N–0,01%B. Предварительно сталь была подвергнута нормализации с 1050 °С с последующим отпуском при 770 °С. После термической обработки структура стали представляла собой реечный троостит отпуска, стабилизированный частицами вторичных фаз карбидов М<sub>23</sub>С<sub>6</sub>, карбонитридов NbX и карбидов М<sub>6</sub>С. Средняя ширина мартенситных реек составляла 380 нм, а плотность дислокаций – 1,4×10<sup>14</sup> м<sup>−2</sup>. При малоцикловой усталости с увеличением амплитуды деформации с 0,2 до 1 % значительно снижается количество циклов до разрушения, а значение пластической деформации в середине количества циклов нагружения существенно увеличивается. Максимальное разупрочнение (18 %) наблюдается при амплитуде деформации 1 % в середине количества циклов нагружения. В целом структура стали после испытаний на малоцикловую усталость не претерпевает существенных изменений: ширина реек увеличивается на 18 % при амплитуде деформации более 0,3 %, при этом плотность дислокаций сохраняется на достаточно высоком уровне (около 10<sup>14</sup> м<sup>−2</sup>) при всех амплитудах деформации. </p></trans-abstract><kwd-group xml:lang="en"><kwd>martensitic heat-resistant steel</kwd><kwd>low-cycle fatigue</kwd><kwd>strain amplitude</kwd><kwd>fatigue softening</kwd><kwd>fatigue failure</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>жаропрочная сталь мартенситного класса</kwd><kwd>малоцикловая усталость</kwd><kwd>амплитуда деформации</kwd><kwd>циклическое разупрочнение</kwd><kwd>усталостное разрушение</kwd></kwd-group><funding-group><funding-statement xml:lang="en">The work was financially supported by the Russian Science Foundation (Agreement No. 19-73-10089-П). Link to information about the project: https://rscf.ru/project/22-73-41001/. The authors express their gratitude to the Joint Research Center of Belgorod State National Research University “Technology and Materials” for the equipment provided for carrying out structural studies. The paper was written on the reports of the participants of the XI International School of Physical Materials Science (SPM-2023), Togliatti, September 11–15, 2023.</funding-statement><funding-statement xml:lang="ru">Работа выполнена при финансовой поддержке Российского научного фонда (соглашение № 19-73-10089-П). Ссылка на информацию о проекте: https://rscf.ru/project/22-73-41001/. Авторы выражают благодарность Центру коллективного пользования «Технологии и Материалы НИУ "БелГУ"» за предоставленное оборудование для проведения структурных исследований. 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