blackmetИзвестия высших учебных заведений. Черная МеталлургияIzvestiya. Ferrous Metallurgy0368-07972410-2091National University of Science and Technology "MISIS"10.17073/0368-0797-2020-6-469-473blackmet-1909Research ArticleМАТЕРИАЛОВЕДЕНИЕMATERIAL SCIENCEСтруктура и твердость наплавленных на низкоуглеродистую сталь износостойких покрытий при низкочастотной модуляции токаStructure and hardness of wear-resistant coatings with low-frequency current modulation deposited on low carbon steelСараевЮ. Н.SaraevYu. N.

д.т.н., главный научный сотрудник лаборатории композиционных материалов

634021, Томск, Академический просп., 2/4

Dr. Sci. (Eng.), Chief Researcher of the Laboratory of Composite Materials

Tomsk

БезбородовВ. П.BezborodovV. P.

к.т.н., старший научный сотрудник лаборатории композиционных материалов

634021, Томск, Академический просп., 2/4

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

Tomsk

val@ispms.tsc.ruПеровскаяМ. В.PerovskayaM. V.

к.т.н., научный сотрудник лаборатории композиционных материалов

634021, Томск, Академический просп., 2/4

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

Tomsk

СеменчукВ. М.SemenchukV. M.

инженер лаборатории композиционных материалов

634021, Томск, Академический просп., 2/4

Engineer of the Laboratory of Composite Materials

Tomsk

Институт физики прочности и материаловедения СО РАНРоссияInstitute of Strength Physics and Materials Science SB RASRussian Federation202001072020636469473Copyright © Сараев Ю.Н., Безбородов В.П., Перовская М.В., Семенчук В.М., 20202020Сараев Ю.Н., Безбородов В.П., Перовская М.В., Семенчук В.М.Saraev Y.N., Bezborodov V.P., Perovskaya M.V., Semenchuk V.M.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/1909

Исследовано влияние режимов ручной электродуговой наплавки покрытий электродами Т-590 на низколегированную сталь 09Г2С на их структуру и твердость. Показано, что при импульсно-дуговой наплавке покрытий электродами формируется мелкодендритная структура наплавленного металла. Микроструктура зоны термического влияния после наплавки состоит из нескольких участков: зона перегрева с видманштеттовой структурой и зона нормализации с характерной мелкозернистой феррито-перлитной структурой. В исходном состоянии основной металл (сталь 09Г2С) имеет твердость ~2500 МПа. Твердость материала наплавленного покрытия из-за сильного перемешивания с металлом стали равна примерно 2700 – 3000 МПа, а зоны термического влияния составляет 2100 – 2300 МПа. При нанесении покрытия на режиме постоянного тока температура нагрева наплавочной ванны выше, что, как следствие, вызывает рост зерна. При нанесении покрытия на импульсных режимах, путем направленного низкочастотного высокоэнергетического воздействия электрической дуги на формируемый металл, за счет постоянного возвратно-поступательного движения расплава с частотой модуляции тока формируется структура, имеющая меньшие размеры составляющих. Установлено, что применение метода импульсно-дуговой наплавки позволяет сохранить в наплавленных покрытиях сформированные ранее упрочняющие фазы.

Influence of the modes of manual electric arc surfacing of coatings with T-590 electrodes on low-alloy steel 09G2S on their structure and hardness was investigated. It is shown that the pulsed arc surfacing of coatings by electrodes forms a fine-dendritic structure of the deposited metal. Microstructure of the heat-affected zone after surfacing consists of several sections: the overheating zone with a widmanstett structure and the normalization zone with a characteristic fine-grained ferrite-perlite structure. In the initial state, the base metal (steel 09G2S) has a hardness of ~2500 MPa. The hardness of the deposited coating material due to strong mixing with the steel metal is ~ 2700 – 3000 MPa, and of thermal impact zone: 2100 – 2300 MPa. When applying the coating on DC mode, heating temperature of the surfacing bath is higher; this, as a consequence, causes grain growth. When coating on pulse modes, a structure with smaller component sizes is formed by directed low-frequency high-energy impact of the electric arc on the formed metal and due to the constant reciprocating motion of the melt with the frequency of current modulation. It was established that the application of the pulse-arc surfacing method allows preserving the previously formed hardening phases in the deposited coatings.

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