cvmetИзвестия вузов. Цветная металлургияIzvestiya. Non-Ferrous Metallurgy0021-34382412-8783НИТУ "МИСИС"10.17073/0021-3438-2024-2-70-84cvmet-1614Research ArticleКоррозия и защита металловCorrosion and Protection of MetalsВлияние легирования марганцем на структуру и свойства электроискровых покрытий на никелевом жаропрочном СЛС-сплаве ЭП741НПInfluence of manganese alloying on the structure and properties of electrospark coatings of EP741NP heat-resistant nickel LPBF alloyhttps://orcid.org/0000-0001-6719-6237МукановС. К.MukanovS. K.

Самат Куандыкович Муканов – к.т.н., мл. науч. сотрудник лаборатории «In situ диагностика структурных превращений» Научно-учебного центра (НУЦ) СВС МИСИС–ИСМАН

119049, г. Москва, Ленинский пр-т, 4, стр. 1

Samat K. Mukanov – Cand. Sci. (Eng.), Junior Research Scientist of the Laboratory “In situ Diagnostics of Structural Transformations” of Scientific Educational Center of Self– Propagating High-Temperature Synthesis (SHS-Center) of MISIS–ISMAN

4 Bld. 1 Leninskiy Prosp., Moscow 119049

smukanov@misis.ruhttps://orcid.org/0000-0002-1736-8050ПетржикМ. И.PetrzhikM. I.

Михаил Иванович Петржик – д.т.н., профессор кафедры порошковой металлургии  и  функциональных  покрытий (ПМиФП) НИТУ МИСИС; вед. науч. сотрудник лаборатории «In situ диагностика структурных превращений» НУЦ СВС МИСИС–ИСМАН

119049, г. Москва, Ленинский пр-т, 4, стр. 1

Mikhail I. Petrzhik – Dr. Sci. (Eng.), Professor of the Department of Powder Metallurgy and Functional Coatings (PM&FC) of NUST MISIS; Leading Research Scientist of the Laboratory “In situ Diagnostics of Structural Transformations” of SHS-Center of MISIS–ISMAN

4 Bld. 1 Leninskiy Prosp., Moscow 119049

 

petrzhik@shs.misis.ruhttps://orcid.org/0000-0003-2505-2918ЛогиновП. А.LoginovP. A.

Павел Александрович Логинов – к.т.н., ст. преподаватель кафедры ПМиФП НИТУ МИСИС; ст. науч. сотрудник лаборатории «In situ диагностика структурных превращений» НУЦ СВС МИСИС–ИСМАН

119049, г. Москва, Ленинский пр-т, 4, стр. 1

Pavel A. Loginov – Cand. Sci. (Eng.), Senior Lecturer of the Department of PM&FC of NUST MISIS; Senior Research Scientist of the Laboratory “In situ Diagnostics of Structural Transformations” of SHS-Center of MISIS–ISMAN

4 Bld. 1 Leninskiy Prosp., Moscow 119049

pavel.loginov.misis@list.ruhttps://orcid.org/0000-0002-0623-0013ЛевашовЕ. А.LevashovE. A.

Евгений Александрович Левашов – д.т.н., акад. РАЕН, профессор, зав. кафедрой ПМиФП НИТУ МИСИС; директор НУЦ СВС МИСИС–ИСМАН

119049, г. Москва, Ленинский пр-т, 4, стр. 1

Evgeny A. Levashov – Dr. Sci. (Eng.), Prof., Academic of the Russian Academy of Natural Science, Head of the Department of PM&FC of NUST MISIS, Head of SHS-Center of MISIS–ISMAN

4 Bld. 1 Leninskiy Prosp., Moscow 119049

levashov@shs.misis.ruНациональный исследовательский технологический университет «МИСИС»РоссияNational University of Science and Technology “MISIS”Russian Federation202430062024027084Copyright © Муканов С.К., Петржик М.И., Логинов П.А., Левашов Е.А., 20242024Муканов С.К., Петржик М.И., Логинов П.А., Левашов Е.А.Mukanov S.K., Petrzhik M.I., Loginov P.A., Levashov E.A.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://cvmet.misis.ru/jour/article/view/1614

Исследовано влияние содержания марганца (Mn = 0; 0,5; 0,6; 1; 1,5 ат.%) в составе электродов системы Al–Ca–Mn на структуру и свойства электроискровых покрытий,  сформированных на СЛС-подложках из сплава ЭП741НП. Обнаружено, что наибольший привес массы подложки (5,8·10–4 г) зафиксирован при электроискровой обработке (ЭИО) электродом Al–7%Ca–1%Mn, имеющим низкую степень переохлаждения расплава (Δt = 5 °С). Процесс ЭИО данным электродом с тонкой эвтектической структурой позволяет формировать покрытия с минимальной шероховатостью поверхности (Ra = 3,51±0,14 мкм). Нанокристаллическая структура покрытий была  подтверждена методами просвечивающей  электронной  микроскопии, в том числе с высоким разрешением. По результатам сравнительных трибологических испытаний обнаружено, что наилучшей износостойкостью (1,86 ·10–5·мм3/(Н· м)) обладает покрытие с максимальной твердостью (10,7±0,8 ГПа), сформированное в процессе ЭИО электродом с содержанием 1,5 ат.% Mn. Показано, что ЭИО электродами Al–Ca–Mn позволяет снизить удельный привес СЛС-сплава ЭП741НП при изотермической (t = 1000 °C) выдержке на воздухе благодаря in situ формированию комплексного термобарьерного слоя, состоящего из оксидов (α-Al2O3, CaMoO4) и интерметаллидов (γ ′-Ni3Al, β-NiAl) . Установлен предел концентрации Mn (1,0 ат.%) в электроде, при которой барьерный слой сохраняет свои целостность и функциональность.

The paper investigates the impact of Mn content (Mn = 0; 0.5; 0.6; 1; 1.5 at.%) in the composition of the electrodes of the Al–Ca–Mn system on the structure and properties of electrospark coatings formed on LPBF substrates made of EP741NP alloy. It was found that the highest weight gain of the substrate (5.8·10–4 g) was recorded when the Al–7%Ca–1%Mn electrode with a low degree of supercooling of the melt (Δt = 5 °C) was subject to electrospark treatment (EST). EST with this electrode with a fine eutectic structure enables the formation of coatings with minimal surface roughness (Ra = 3.51±0.14 μm). The nanocrystalline structure of the coatings was confirmed by transmission electron microscopy, including HRTEM. Comparative tribological tests revealed that the coating with maximum hardness (10.7±0.8 GPa) formed during EST with an electrode containing 1.5 at.% Mn had the minimal wear rate (1.86 ·10–5 mm3/(N· m)). We proved that EST with Al–Ca–Mn electrodes enables to reduce the specific weight gain of the LPBF EP741NP alloy during isothermal (t = 1000 °C) curing in air due to in situ formation of a complex thermal barrier layer consisting of oxides (α-Al2O3, CaMoO4) and intermetallides (γ ′-Ni3Al and β-NiAl). We determined the concentration limit of Mn (1.0 at.%) in the electrode, at which the barrier layer retains its integrity and functionality.

 

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