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Влияние когерентной двойниковой границы на высокотемпературную ползучесть стали 321SS (12Х18Н10Т), не стабилизированной титаном
Аннотация
Для исследования использовали коммерческие пластины из нержавеющей стали 321 (12Х18Н10Т), которые подвергались обработке методом инженерии границ зерен (ИГЗ). Обнаружено, что доля длины границ решетки с низким значением Σ узлов совпадения (Σ3 + Σ9 + Σ27) увеличилась с 39,3 % (до обработки ИГЗ) до 75,9 % (после обработки ИГЗ), а доля когерентных границ Σ3 увеличилась с 26,2 % до 58,1 %. Испытания на ползучесть проводили при 550 °C под действием различных напряжений на образцах стали, не стабилизированной титаном. Результаты показали, что сопротивление высокотемпературной ползучести стали возрастает более чем на 70 % после обработки ИГЗ. Анализ методом дифракции обратного рассеяния электронов и наноиндентирования показал, что концентрация напряжений ползучести на когерентных двойниковых границах (КДГ) ниже, чем на случайных границах зерен, что снижает вероятность образования пустот или трещин на КДГ. Кроме того, КДГ оказывают подавляющее действие на распространение трещин на границах зерен. Результаты этого исследования имеют важное значение для углубления понимания роли КДГ в высокотемпературной деформации ползучести металлических материалов c ГЦК-решеткой без вторичных фаз в структуре.
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Литература
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DOI: https://doi.org/10.30906/mitom.2025.7.5-6
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