Структура и свойства поверхностных слоев хромоникелевой стали, легированной частицами карбида кремния
Аннотация
Исследованы структура и свойства хромоникелевой аустенитной стали с поверхностным слоем, модифицированным кремнием при наплавке порошкового карбида кремния пучком релятивистских электронов, выведенным в воздушную атмосферу. Показано, что в процессе электронно-лучевого нагрева в поверхностных слоях, толщина которых достигает 2800 мкм, формируется структура, состоящая из аустенитной матрицы, легированной кремнием, сложных карбидов хрома (Cr, Fe)7C3 преимущественно дендритного строения, а также карбидов кремния Si5C3. Твердорастворное упрочнение и наличие карбидов способствуют увеличению микротвердости модифицированного слоя стали до 10 ГПа, что в 4 раза превышает твердость основного металла. Показано, что жаростойкость аустенитной стали с модифицированными слоями при 850 °C в 2 раза выше, чем у основного металла.
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Литература
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DOI: https://doi.org/10.30906/mitom.2024.11.28-35
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