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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">1141</article-id><article-id pub-id-type="doi">10.18323/2782-4039-2025-4-74-1</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">Effect of test temperature on low-cycle fatigue of high-chromium steel with high boron and low nitrogen content</article-title><trans-title-group xml:lang="ru"><trans-title>Влияние температуры испытания на малоцикловую усталость высокохромистой стали с высоким содержанием бора и низким содержанием азота</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>младший научный сотрудник ЦКП «Технологии и Материалы»</p></bio><email>brazhnikov@bsuedu.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>доктор 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="2025-12-29" publication-format="electronic"><day>29</day><month>12</month><year>2025</year></pub-date><issue>4</issue><issue-title xml:lang="ru"/><fpage>9</fpage><lpage>24</lpage><history><date date-type="received" iso-8601-date="2025-12-29"><day>29</day><month>12</month><year>2025</year></date><date date-type="accepted" iso-8601-date="2025-12-29"><day>29</day><month>12</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Brazhnikov I.S., Fedoseeva A.E.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Бражников И.С., Федосеева А.Э.</copyright-statement><copyright-year>2025</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/1141">https://vektornaukitech.ru/jour/article/view/1141</self-uri><abstract xml:lang="en"><p>High-boron 9–10 % chromium martensitic steels are an advanced material for manufacturing various components of thermal power units in coal-fired power plants operating under ultra-supercritical steam conditions (up to 650 °C and 35 MPa), enabling an increase in efficiency to 44 % and reduction of harmful environmental emissions. The work studies the influence of various testing conditions on the behaviour of a 10 % Cr martensitic steel with high boron and low nitrogen content, additionally alloyed with cobalt, tungsten, molybdenum, copper, and rhenium, under lowcycle fatigue (LCF). After heat treatment, the steel microstructure consisted of tempered lath troostite with a high dislocation density. The main strengthening phases were identified: grain-boundary M23C6 carbide particles with an average size of 70 nm and uniformly distributed NbX carbonitrides with an average size of 30 nm. Increasing the strain amplitude during low-cycle fatigue significantly reduces the number of cycles to failure regardless of test temperature, due to intensive development of plastic deformation. Microstructural analysis revealed no significant changes in the lath structure after low-cycle fatigue testing at room temperature, while at elevated temperatures, structural recrystallisation initiates and a well-developed subgrain structure with an average subgrain size of about 600±50 nm forms.</p></abstract><trans-abstract xml:lang="ru"><p>9–10 % Сr стали мартенситного класса c высоким содержанием бора являются новым материалом для изготовления различных элементов тепловых энергоблоков угольных электростанций, работающих при суперсверхкритических параметрах пара (до 650 °C и 35 МПа), что позволяет увеличить КПД до 44 % и сократить вредные выбросы в окружающую среду. Работа посвящена исследованию влияния различных условий испытаний на поведение 10 % Cr стали мартенситного класса, дополнительно легированной кобальтом, вольфрамом, молибденом, медью и рением, с высоким B и низким N при малоцикловой усталости (МЦУ). После термической обработки структура стали представляла собой реечный троостит отпуска с высокой плотностью дислокаций. Были выявлены основные упрочняющие фазы: зернограничные частицы карбидов М23С6 со средним размером 70 нм и равномерно распределенные карбонитриды NbX со средним размером 30 нм. Увеличение амплитуды деформации при МЦУ значительно снижает количество циклов до разрушения независимо от температуры испытания за счет сильного развития пластической деформации. Микроструктурный анализ выявил отсутствие существенных изменений в реечной структуре после испытаний на МЦУ при комнатной температуре, в то время как при повышенных температурах начинается рекристаллизация структуры и формируется хорошо развитая субзеренная структура со средним размером субзерен около 600±50 нм.</p></trans-abstract><kwd-group xml:lang="en"><kwd>martensitic heat-resistant steel</kwd><kwd>mechanical properties</kwd><kwd>low-cycle fatigue</kwd><kwd>microstructure</kwd><kwd>fractography</kwd><kwd>cyclic softening</kwd><kwd>fatigue failure</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>жаропрочная сталь мартенситного класса</kwd><kwd>механические свойства</kwd><kwd>малоцикловая усталость</kwd><kwd>микроструктура</kwd><kwd>фрактография</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. 24-79-10112). Project information link: https://rscf.ru/project/24-79-10112/. The authors express their gratitude to the Common Use Center “Technologies and Materials” of Belgorod State National Research University for providing equipment for mechanical tests and structural studies. The paper was written on the reports of the participants of the XII International School of Physical Materials Science (SPM-2025), Togliatti, September 15–19, 2025.</funding-statement><funding-statement xml:lang="ru">Работа выполнена при финансовой поддержке РНФ (соглашение № 24-79-10112). Ссылка на информацию о проекте: https://rscf.ru/project/24-79-10112/. Авторы выражают благодарность Центру коллективного пользования «Технологии и Материалы НИУ "БелГУ"» за предоставленное оборудование для проведения механических испытаний и структурных исследований. 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