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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">npe</journal-id><journal-title-group><journal-title xml:lang="ru">Ядерная физика и инжиниринг</journal-title><trans-title-group xml:lang="en"><trans-title>Nuclear Physics and Engineering</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2079-5629</issn><issn pub-type="epub">2079-5637</issn><publisher><publisher-name>МИФИ</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.56304/S2079562924060381</article-id><article-id custom-type="edn" pub-id-type="custom">TZGLRH</article-id><article-id custom-type="elpub" pub-id-type="custom">npe-404</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>Перспективные конструкционные материалы</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Promising Structural Materials</subject></subj-group></article-categories><title-group><article-title>ЗАКОНОМЕРНОСТИ ФОРМИРОВАНИЯ СТРУКТУРЫ БЫСТРОЗАКАЛЕННОГО ПОРОШКА ЖАРОПРОЧНОГО СПЛАВА НА ОСНОВЕ TI, ПОЛУЧЕННОГО PREP МЕТОДОМ</article-title><trans-title-group xml:lang="en"><trans-title>REGULARITIES OF THE STRUCTURE FORMATION OF RAPIDLY QUENCHED POWDER OF THE HEAT-RESISTANT TI-BASED ALLOY PRODUCED BY PREP-METHOD</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>Шульга</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Shulga</surname><given-names>A. V</given-names></name></name-alternatives><email xlink:type="simple">avshulga@mephi.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Национальный исследовательский ядерный университет “МИФИ”</institution><country>Россия</country></aff><aff xml:lang="en"><institution>National Research Nuclear University MEPhI (Moscow Engineering Physics Institute)</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>25</day><month>12</month><year>2024</year></pub-date><volume>15</volume><issue>6</issue><fpage>552</fpage><lpage>566</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Шульга А.В., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Шульга А.В.</copyright-holder><copyright-holder xml:lang="en">Shulga A.V.</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://npe.elpub.ru/jour/article/view/404">https://npe.elpub.ru/jour/article/view/404</self-uri><abstract><p>Проведено многоуровневое исследование структуры сферических частиц (гранул) быстроза каленного порошка жаропрочного (α + β) сплава на основе титана, полученного PREP методом, который использовался в дальнейшем для изготовления изделий по PM HIP технологии. Методы металлографии, SEM, EDX, OIM использовались для изучения структуры гранул различного размера. Выявлено влияние размера гранул и вакуумной термообработки при температурах в областях (α + β)- и β-фазы на закономерности формирования микроструктуры гранул. Дендритная микроструктура зерен метастабильной β-фазы обнаружена в частицах (гранулах) исходного быстрозакаленного PREP-порошка. Дендритная сегрегация легирующих элементов выявлена отчетливо в более крупных частицах, в частности для Мо. В более мелких частицах наблюдалось образование более высокодисперсной структуры. Определено влияние уменьшения размера гранул на снижение размерного параметра дендритной структуры (SDAS). Построена схематическая TTT диаграмма фазовых превращений в исследованном сплаве, включая кристаллизацию, мартенситное превращение и β → (α + β)-нормальное диффузионное превращение.</p></abstract><trans-abstract xml:lang="en"><p>A multiscale study of the structure of spherical particles (granules) of rapidly quenched powder of a heat-resistant (α + β) titanium-based alloy obtained by the PREP method, which has been subsequently used for the manufacture of products using PM HIP technology, has been carried out. Metallography LM, SEM, EDX, OIM methods are used to study the structure of granules of different sizes. The influence of the granule size and vacuum heat treatment at temperatures in the fields of (α + β) and β phases on the regularities of the formation of the microstructure of granules has been revealed. The dendrite microstructure of grains of the metastable β phase has been found in the particles (granules) of the original rapidly quenched PREP powder. Dendrite segregation of alloying elements is clearly revealed in larger particles, for example, for Mo. In smaller particles, the formation of a more highly dispersed structure has been observed. The controlling effect of granule size decreasing on the reduction of dendrite structure size parameter (SDAS) has been determined. Schematic TTT diagrams of phase transformations in the studied alloy, including crystallization, martensitic transformation, and normal diffusion transformation β → (α + β), have been constructed.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>жаропрочный α+β сплав на основе титана</kwd><kwd>быстрозакаленный PREP-порошок</kwd><kwd>PM HIP-технология</kwd><kwd>дендритная структура</kwd><kwd>сегрегация легирующих элементов</kwd><kwd>размерный параметр</kwd></kwd-group><kwd-group xml:lang="en"><kwd>heat-resistant α + β titanium-based alloy</kwd><kwd>rapidly quenched PREP powder</kwd><kwd>PM HIP technology</kwd><kwd>dendritic structure</kwd><kwd>segregation of alloying elements</kwd><kwd>dimensional parameter of dendritic structure (SDAS)</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">Leyens Ch., Peters M. (Eds.) Titanium and Titanium Alloys. 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