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Исследование механизма образования сложной окалины на жаропрочной стали 25Cr18Ni9Si2

Ван Хайтао, Сунь Шуфэн

Аннотация


Методами сканирующей электронной микроскопии, энергодисперсионного анализа и рентгеновской дифрактометрии исследованы кинетика и механизм образования окалины сложного состава и строения на поверхности жаропрочной стали 25Cr18Ni9Si2 в процессе окисления при 900 °C в течение 500 ч. Установлен состав окалины, определено соотношение между привесом и длительностью окисления. Показано, что формирование сложной окалины связано с одновременным окислением и восстановлением Si, Cr, Fe, Ni, сопровождающимся измельчением зерен оксидов. Сделан вывод, что именно плотная композитная окалина обеспечивает высокую стойкость стали к окислению.

Ключевые слова


жаропрочная сталь; стойкость к окислению; сложная окалина; термодинамика; кинетика

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Литература


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DOI: https://doi.org/10.30906/mitom.2021.10.23-29

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