Structure and Magnetic Properties of a Nickel-Based Superalloy after Deformation

D. I. Davydov; S. V. Afanasiev; V. P. Pilyugin; D. A. Shishkin; P. B. Terent'ev

doi:10.17804/2410-9908.2016.1.016-028

D. I. Davydov, S. V. Afanasiev, V. P. Pilyugin, D. A. Shishkin, P. B. Terent'ev

STRUCTURE AND MAGNETIC PROPERTIES OF A NICKEL-BASED SUPERALLOY AFTER DEFORMATION

DOI: 10.17804/2410-9908.2016.1.016-028

The structure and magnetic properties of ChS-70 nickel-based superalloy samples have been compared after different types of deformation. The different behavior of the magnetic properties is governed by the difference in the structure resulting from deformation. High-temperature tensile tests and shear deformation under high pressure have been performed for ChS-70 alloy samples. Samples cut from different parts of a turbine blade after operation under forced conditions have been examined. The deformation of the Chs-70 alloy under operation increases magnetic susceptibility, which is due to the formation of complex defects of the crystalline structure inside the intermetallic particles (Ni3Al). Dynamical recovery during the high-temperature tensile tests leads to relaxation, elimination of crystal lattice defects, and the magnetic properties remain unchanged. Shear under high pressure causes a nanocrystalline structure in the alloy, a significant decrease in the degree of the long-range order in the intermetallic phase and the preservation of the paramagnetic state.

Keywords: structure, deformation, magnetic properties, stacking faults, nickel-based alloy

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Д. И. Давыдов, С. В. Афанасьев, В. П. Пилюгин, Д. А. Шишкин, П. Б. Терентьев

СТРУКТУРА И МАГНИТНЫЕ СВОЙСТВА ЖАРОПРОЧНОГО НИКЕЛЕВОГО СПЛАВА ПОСЛЕ ДЕФОРМАЦИИ

Проведено сравнение структуры и магнитных свойств образцов жаропрочных никелевых сплавов ЧС-70 после различных видов деформации. Различный характер изменения магнитных свойств определяется различием структуры, сформированной в результате деформации.
Для ЧС-70 проведены высокотемпературные испытания на растяжение; деформация сдвигом под высоким давлением, исследованы образцы, вырезанные из разных частей турбинной лопатки после эксплуатации по форсированному режиму. Деформация сплава ЧС-70 в ходе его эксплуатации приводит к возрастанию магнитной восприимчивости, связаному с формированием комплексов дефектов кристаллического строения внутри частиц интерметаллидной фазы (Ni3Al). Динамический возврат при высокотемпературных испытаниях на растяжение приводит к релаксации, устранению дефектов кристаллической решетки, и магнитные свойства сплава не изменяются. Сдвиг под высоким давлением приводит к образованию в сплаве нанокристаллической структуры, к значительному уменьшению степени дальнего порядка интерметаллической фазы и сохранению парамагнитного состояния.

Ключевые слова: структура, деформация, магнитные свойства, дефекты упаковки, никелевые сплавы

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Библиографическая ссылка на статью

Structure and Magnetic Properties of a Nickel-Based Superalloy after Deformation / D. I. Davydov, S. V. Afanasiev, V. P. Pilyugin, D. A. Shishkin, P. B. Terent'ev // Diagnostics, Resource and Mechanics of materials and structures. - 2016. - Iss. 1. - P. 16-28. -
DOI: 10.17804/2410-9908.2016.1.016-028. -
URL: http://dream-journal.org/issues/2016-1/2016-1_70.html
(accessed: 21.11.2024).