blackmetИзвестия высших учебных заведений. Черная МеталлургияIzvestiya. Ferrous Metallurgy0368-07972410-2091National University of Science and Technology "MISIS"10.17073/0368-0797-2021-9-679-684blackmet-2173Research ArticleМЕТАЛЛУРГИЧЕСКИЕ ТЕХНОЛОГИИMETALLURGICAL TECHNOLOGIESМодификация поверхностного слоя стали соединениями с высокой температурой плавления методами электрошлаковой наплавкиModification of steel surface layer by electroslag surfacing using compounds with high melting pointСараевЮ. Н.SaraevYu. N.

Юрий Николаевич Сараев, д.т.н., доцент, главный научный сотрудник лаборатории композиционных материалов

634021, Томск, Академический пр., 2/4

Yurii N. Saraev, Dr. Sci. (Eng.), Assist. Prof., Chief Researcher of the Laboratory of Composite Materials

2/4 Akademicheskii Ave., Tomsk 634021

litsin@ispms.tsc.ruБезбородовВ. П.BezborodovV. Р.

Валерий Павлович Безбородов, к.т.н., старший научный сотрудник лаборатории композиционных материалов

634021, Томск, Академический пр., 2/4

Valerii P. Bezborodov, Cand. Sci. (Eng.), Senior Researcher of the Laboratory of Composite Materials

2/4 Akademicheskii Ave., Tomsk 634021

val@ispms.tsc.ruhttps://orcid.org/0000-0003-2780-6023ПеровскаяМ. В.PerovskayaМ. V.

Марина Владимировна Перовская, к.т.н., научный сотрудник лаборатории композиционных материалов

634021, Томск, Академический пр., 2/4

Marina V. Perovskaya, Cand. Sci. (Eng.), Research Associate of the Laboratory of Composite Materials

2/4 Akademicheskii Ave., Tomsk 634021

mv_perovskaya@inbox.ruhttps://orcid.org/0000-0002-7215-0505СеменчукВ. М.SemenchukV. М.

Вячеслав Максимович Семенчук, младший научный сотрудник лаборатории композиционных материалов

634021, Томск, Академический пр., 2/4

Vyacheslav M. Semenchuk, Junior Researcher of the Laboratory of Composite Materials

2/4 Akademicheskii Ave., Tomsk 634021

Институт физики прочности и материаловедения СО РАНРоссияInstitute of Strength Physics and Materials Science, Siberian Branch of the Russian Academy of SciencesRussian Federation202108102021649679684Copyright © Сараев Ю.Н., Безбородов В.П., Перовская М.В., Семенчук В.М., 20212021Сараев Ю.Н., Безбородов В.П., Перовская М.В., Семенчук В.М.Saraev Y.N., Bezborodov V.Р., Perovskaya М.V., Semenchuk V.М.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://fermet.misis.ru/jour/article/view/2173

В работе изучено влияние легирования на структуру, микротвердость и абразивную износостойкость слоев электрошлаковой наплавки на низколегированную конструкционную сталь 09Г2С. Для модифицирования использовали смеси порошков Si3 N4   +  FeSi2   +  Si, полученные в отделе структурной макрокинетики Томского научного центра СО РАН методом СВС-синтеза, а также порошковых композиций на основе TiC. Из низколегированной стали Ст3 изготавливался расплавляемый электрод, на который высыпались модифицирующие композиции Si3 N4   +  FeSi2   +  Si в первом случае, и модифицирующие композиции Si3 N4   +  FeSi2   +  Si, располагаемые снизу, во втором случае. Методами металлографии и рентгеновского микроанализа определена структура и проведен анализ состава наплавленных слоев, зоны термического влияния и основного металла, на основании которого высказаны предположения о природе формирования свойств покрытий – твердости, износостойкости. Показано, что основное влияние на износостойкость оказывает структура металла наплавки. Установлено положительное влияние модифицирования покрытий легирующими материалами со сплавами Si3 N4   +  FeSi2   +  Si и  Ст3, TiC  и  Ст3. В расплавленном слое выделяется множество новых центров кристаллизации в виде дисперсных частиц TiC. Дисперсные частицы TiC, обладающие высокой температурой плавления (3180 °C), первыми выпадают из расплава и не только служат множественными центрами кристаллизации, но и препятствует росту аустенитного зерна, что обеспечивает формирование дисперсной структуры. Покрытия содержат частицы карбида TiC, а также включения других фаз. При этом повышение твердости наплавленного слоя, содержащего включения карбида титана, наблюдается в направлении к границе с основой. Износостойкость слоя возрастает при формировании покрытия на основе TiC. Полученные данные могут быть использованы при создании на поверхности металла наплавленных слоев с  высокой стойкостью против абразивного износа.

The authors have studied the effect of alloying on the structure, microhardness and abrasive wear resistance of electroslag surfacing layers on low-alloy structural steel 09G2S. For modification, mixtures of Si3 N4   +  FeSi2   +  Si powders obtained in the Department of Structural Macrokinetics of  the Tomsk Scientific Centre SB RAS by the method of SHS synthesis, as well as powder compositions based on TiC, were used. A molten electrode was made of low-alloy steel St3, on which modifying compositions Si3 N4   +  FeSi2   +  Si were poured out, in the first case, and modifying compositions  Si3 N4   +  FeSi2   +  Si, located below, in the second case. Metallography and X-ray microanalysis methods were used to determine the structure and  to  analyze the composition of the deposited layers, heat-affected zone (HAZ) and the base metal, on the basis of which assumptions were made about  the nature of the formation of coating properties – hardness and wear resistance. It is shown that the main influence on the wear resistance is exerted  by structure of the surfacing metal. There is a positive effect of modifying coatings by alloying materials with the alloys Si3 N4   +  FeSi2   +  Si  +  St3  and TiC  +  St3. In the molten layer, many new crystallization centers are released in the form of dispersed TiC particles. Dispersed TiC particles with  a  high melting point (3180  °C) are the first to fall out of the melt and not only serve as multiple crystallization centers, but also prevent the growth of  austenitic grains, which ensures the formation of dispersed structure. The coatings contain TiC carbide particles, as well as inclusions of other phases. At the same time, an increase in hardness of the deposited layer containing titanium carbide inclusions is observed in direction of the boundary with the base. Wear resistance of the layer increases when a TiC-based coating is formed. The obtained data can be used to create deposited layers on the metal surface with high resistance against abrasive wear. 

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The authors declare that there are no conflicts of interest present.