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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">10.17073/0368-0797-2020-1-57-62</article-id><article-id custom-type="elpub" pub-id-type="custom">blackmet-1833</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>Зависимость отбела чугуна от его углеродного эквивалента</article-title><trans-title-group xml:lang="en"><trans-title>Dependence of cast iron chill from its carbon equivalent</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>Тен</surname><given-names>Э. Б.</given-names></name><name name-style="western" xml:lang="en"><surname>Ten</surname><given-names>E. B.</given-names></name></name-alternatives><bio xml:lang="ru"><p>д.т.н., профессор кафедры «Литейные технологии и художественная обработка материалов»</p><p>119049, Россия, Москва, Ленинский проспект, 4</p></bio><bio xml:lang="en"><p>Dr. Sci. (Eng.), Professor of the Chair “Foundry Technology and Art Processing of Materials”</p></bio><email xlink:type="simple">edis_ten@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>Коль</surname><given-names>О. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Kol’</surname><given-names>O. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>старший преподаватель кафедры «Литейные технологии и художественная обработка материалов»</p><p>119049, Россия, Москва, Ленинский проспект, 4</p></bio><bio xml:lang="en"><p>Senior Lecturer of the Chair “Foundry Technology and Art Processing of Materials”</p></bio><email xlink:type="simple">kohlolga@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">Национальный исследовательский технологический университет «МИСиС»<country>Россия</country></aff><aff xml:lang="en">National University of Science and Technology “MISIS” (MISIS)<country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2020</year></pub-date><pub-date pub-type="epub"><day>29</day><month>03</month><year>2020</year></pub-date><volume>63</volume><issue>1</issue><fpage>57</fpage><lpage>62</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Тен Э.Б., Коль О.А., 2020</copyright-statement><copyright-year>2020</copyright-year><copyright-holder xml:lang="ru">Тен Э.Б., Коль О.А.</copyright-holder><copyright-holder xml:lang="en">Ten E.B., Kol’ O.A.</copyright-holder><license 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/1833">https://fermet.misis.ru/jour/article/view/1833</self-uri><abstract><p>Исследована количественная связь показателей отбела чугуна (протяженности отбеленного слоя H и объемной доли в нем ледебурита Qл ) с его углеродным эквивалентом СE . Эти данные позволяют с высокой вероятностью прогнозировать развитие процесса формирования отбеленного поверхностного слоя при изготовлении отливок различной толщины из чугуна разного химического состава. Объектом исследования являлись нелегированные чугуны индукционной плавки восьми вариантов химического состава с углеродным эквивалентом от 3,30 до 5,53 %. Из этих чугунов в песчаной форме с нижним холодильником изготовляли ступенчатые отливки с размерами ступенек 100×60 мм толщиной 5, 10, 20 и 40 мм. Протяженность (глубину) отбеленного слоя измеряли в изломах отливок и оценивали по толщине зоны чистого отбела. Объемную долю ледебурита определяли металлографическим методом с применением компьютерной программы «Nexsys-Imageexpertpro 3». Согласно экспериментальным данным, при толщине отливок 5 и 10 мм сквозной (на всю толщину) чистый отбел формируется при углеродном эквиваленте ≤ 4,08 % и ≤ 3,67 % соответственно. В отливках толщиной 20 и 40 мм зона чистого отбела отсутствует, при этом глубина отбеленного переходного слоя возрастает с уменьшением углеродного эквивалента, но снижается с увеличением толщины отливки X. Установлено, что зависимость H от СЕ имеет экспоненциальный характер и описывается уравнением типа H = A exp (–k СE ), где A и k – эмпирические коэффициенты. Объемная доля ледебурита у поверхности контакта отливки с холодильником во всех пробах составляет ~90 %, но по мере удаления от поверхности уменьшается с разной интенсивностью в зависимости от величины углеродного эквивалента и толщины отливки. Математической обработкой экспериментальных данных, полученных на расстоянии 5 мм от поверхности контакта отливки с холодильником, установлено, что количественная связь Qл в отбеленном слое отливки со значением CE описывается экспоненциальной зависимостью</p></abstract><trans-abstract xml:lang="en"><p>Numerical relation of cast iron chill characteristics (distance of chilled layer H and volume quota of ledeburite in it Qл ) with its carbon equivalent СE was investigared. This data helps to prognosticate with high probability the evolution of the surface chilled layer forming at the production of castings with different thickness from cast iron of various chemical compositions. The object of study is the unalloyed induction melted cast iron with eight variants of chemical composition with carbon equivalent from 3.30 up to 5.53 %. From these cast irons we made the step-by-step castings with steps sizes of 10×60 mm and thickness of 5, 10, 20 and 40 mm. The distance (depth) of chilled layer was measured at the fractures of the castings and gaged on thickness of full chill zone. Ledeburite volume quota was detected by metallographic method using “Nexsys-Image expert pro 3” computer program. According to experimental data, when the casting thickness is 5 and 10 mm the through (at all thickness) full chill is formed at carbon equivalent ≤ 4.08 % and ≤ 3.67 % consequently. At the castings with 20 and 40 mm thickness the zone of full chill is absent, and in this case the chilled layer depth increases with a decrease of carbon equivalent and decreases with an increase of casting’s thickness X. The dependence of H from СЕ have the exponential character and can be described by the equation H = A exp (–k СE ), where A and k are empirical coefficients. Ledeburite volume quota near the contact surface of casting with chiller is near 90 %, but with an increase in the distance from the surface it decreases with different intensity depending on changes of carbon equivalent and casting’s thickness. By mathematical processing of the experimental data received for the distance of 5 mm from the contact surface of the casting with chiller, we have detected that numerical re lation Qл in casting chilled layer with value of CE can be described by the exponential dependence</p></trans-abstract><kwd-group xml:lang="ru"><kwd>песчаная форма</kwd><kwd>чугун</kwd><kwd>индукционная плавка</kwd><kwd>углеродный эквивалент</kwd><kwd>ступенчатая проба</kwd><kwd>толщина отливки</kwd><kwd>излом</kwd><kwd>глубина отбела</kwd><kwd>микроструктура</kwd><kwd>объемная доля ледебурита</kwd></kwd-group><kwd-group xml:lang="en"><kwd>send mold</kwd><kwd>cast iron</kwd><kwd>induction melting</kwd><kwd>carbon equivalent</kwd><kwd>step-by-step sample</kwd><kwd>thickness of castings</kwd><kwd>fracture</kwd><kwd>chilled layer depth</kwd><kwd>microstructure</kwd><kwd>ledeburite volume quota</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">Справочник по чугунному литью / Под ред. 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