ОСОБЕННОСТИ ПОВЕДЕНИЯ БОРА ПРИ ДИНАМИЧЕСКОМ ДЕФОРМАЦИОННОМ СТАРЕНИИ В ЖАРОПРОЧНОМ НИКЕЛЕВОМ СУПЕРСПЛАВЕ, ПОЛУЧЕННОМ ПО PM HIP ТЕХНОЛОГИИ – I. ИСПЫТАНИЕ НА ВЫСОКОТЕМПЕРАТУРНОЕ РАСТЯЖЕНИЕ

Представлены результаты комплексного многомасштабного исследования структуры и распределения бора в зоне разрушения жаропрочного никелевого суперсплава EP741NP, полученного по PM HIP технологии с использованием быстрозакаленного PREP порошка, после высокотемпературного испытания на растяжение. Прямым ядерно-физическим методом трековой авторадиографии в сочетании с металлографическим (LM), (SEM), (EDX) и OIM методами проведено детальное изучение макро-, мезо-, микроструктуры и распределения бора в зоне разрушения. Выявлен эффект динамического деформационного старения (DSA) с участием бора на стадии разрушения, заключающийся в интенсивной миграции бора в зоне пластической деформации шейки с аномально высоким эффективным коэффициентом диффузии и образовании крупных аллотриоморфнных выделений боридной фазы M ₃ B ₂ на мезо масштабной петле сдвига и мезо масштабных полосах сдвига типа полос Портевен-Ле Шателье (PLC) в короне петли, локализованных вокруг раскрывающейся мезо масштабной трещины в области локализованной деформации шейки. Выявленный эффект DSA с участием бора аналогичен эффекту DSA с участием углерода и образованием полос PLC, декорированных дисперсными карбидами в суперсплавах на основе никеля и аустенитных коррозионно-стойких сталях на стадии деформационного упрочнения.

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