Studying the Plastic Deformability of a Ni–fe–cr–ti–b–c Composite

N. B. Pugacheva; D. I. Vichuzhanin; Т. М. Bykova; I. S. Kamantsev

doi:10.17804/2410-9908.2023.5.015-030

N. B. Pugacheva, D. I. Vichuzhanin, Т. М. Bykova, I. S. Kamantsev

STUDYING THE PLASTIC DEFORMABILITY OF A Ni–Fe–Cr–Ti–B–C COMPOSITE

DOI: 10.17804/2410-9908.2023.5.015-030

The paper studies changes in the structural state of a Ni–Fe–Cr–Ti–B–C composite after hot plastic deformation. The matrix of the composite consists of a mechanical mixture of two solid solutions: austenite and ferrite. Titanium carbide and diboride particles resulting from self-propagating high-temperature synthesis (SHS) are the strengthening phases. Additional strengthening is provided by carbide Cr₂₃C₆and intermetallic Ni₃Ti particles formed in austenite during cooling. The constituent with a ferrite matrix, which is a mixture of α-(Cr,Fe) + TiB₂ + TiC + Cr₂₃C₆,
is shown to have the highest ductility. The strongest constituent of the composite is represented by regions with an austenitic matrix and the most abundant TiB₂ particles. These regions are characterized by the highest hardness, elastic modulus, elastic recovery Re and wear resistance ratio H_IT/E. The hardness of the composite is 58 HRC. For plastic deformation of the composite, it is proposed to perform hot rolling at a heating temperature of 1000 °C under all-round compression. To do this, a composite specimen is pressed into a 10 mm steel shell, with 6 mm steel plates welded on top and from below. True plastic strain ε = 0.6 is achieved under these conditions. EBSD analysis testifies that the deformation is implemented due to dynamic polygonization and recrystallization of the austenitic and ferritic grains of the composite matrix. Dynamic recrystallization prevails in the austenitic grains, whereas dynamic polygonization predominates in the ferritic ones.

Acknowledgement: The equipment of the Plastometriya shared research facilities at the Institute of Engineering Science, Ural Branch of the Russian Academy of Sciences, was used in the research. The study was carried out under the state assignment for the Institute of Engineering Science, UB RAS.

Keywords: self-propagating high-temperature synthesis, composite, matrix, microstructure, microindentation, rolling, plastic deformation, dynamic recrystallization, dynamic polygonization

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Н. Б. Пугачева, Д. И. Вичужанин, Т. М. Быкова, И. С. Каманцев

ИССЛЕДОВАНИЕ ПЛАСТИЧЕСКОЙ ДЕФОРМИРУЕМОСТИ КОМПОЗИТА СИСТЕМЫ Ni–Fe–Cr–Ti–B–C

Исследованы изменения структурного состояния СВС-композита системы Ni–Fe–Cr–Ti–B–C после горячей пластической деформации. Матрица композита представляет собой механическую смесь двух твердых растворов: аустенита и феррита. Упрочняющими фазами являются частицы карбида и диборида титана, образовавшиеся в результате самораспространяющегося высокотемпературного синтеза. Дополнительное упрочнение обеспечивают частицы карбида Cr23C6 и интерметаллида Ni3Ti, образующиеся при охлаждении в аустените. Показано, что максимальной пластичностью обладает структурная составляющая с ферритной матрицей, представляющая собой механическую смесь α-(Cr,Fe) + TiB2 + TiC + Cr23C6. Наиболее прочной структурной составляющей композита являются области с аустенитной матрицей, содержащие наибольшее количество частиц TiB2 и характеризующиеся максимальными значениями твердости, модуля упругости, показателя упругого восстановления Re и условного показателя износостойкости HIT/E. Твердость композита составила 58 HRC. Для осуществления пластической деформации композита предложено проводить горячую прокатку при температуре нагрева 1000 °C в условиях всестороннего сжатия. С этой целью образец композита запрессовывали в стальную оболочку толщиной 10 мм, а сверху и снизу приваривали стальные пластины толщиной 6 мм. В данных условиях реализована истинная пластическая деформация композита ε = 0,6. По результатам EBSD-анализа установлено, что деформация происходит за счет динамической полигонизации и рекристаллизации аустенитных и ферритных зерен матрицы композита. При этом в аустенитных зернах преобладает динамическая рекристаллизация, а в ферритных – динамическая полигонизация.

Благодарность: Работа выполнена на оборудовании ЦКП «Пластометрия» ИМАШ УрО РАН в соответствии с государственным заданием ИМАШ УрО РАН.

Ключевые слова: самораспространяющийся высокотемпературный синтез, композит, матрица, микроструктура, микроиндентирование, прокатка, пластическая деформация, динамическая рекристаллизация, динамическая полигонизация

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Библиографическая ссылка на статью

Studying the Plastic Deformability of a Ni–fe–cr–ti–b–c Composite / N. B. Pugacheva, D. I. Vichuzhanin, Т. М. Bykova, I. S. Kamantsev // Diagnostics, Resource and Mechanics of materials and structures. - 2023. - Iss. 5. - P. 15-30. -
DOI: 10.17804/2410-9908.2023.5.015-030. -
URL: http://dream-journal.org/issues/2023-5/2023-5_408.html
(accessed: 21.12.2024).