Influences of a Hot-Working Process on the Microstructural Evolution and Creep Performance of a Spray-Formed Nickel-Based Superalloy

Tian, Tian; Chen, Ge; Li, Xinggang; Hao, Zhibo; Peng, Shiqing; Jia, Chonglin

doi:10.3390/met10040454

Cited by 2 publications

(3 citation statements)

References 26 publications

(31 reference statements)

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“…Испытания проводили на испытательной машине ATS 2330. Зависимости Ларсона-Миллера (LMP) для прогнозирования продолжительности испытания образцов сплава до разрушения рассчитывали по формуле [11][12][13]: LMP = T × [log t раз + 20], где T -абсолютная температура испытания на длительную прочность, t раз -время до разрушения образца [9,10]. Механические испытания проводили на воздухе.…”

Section: материал и методики экспериментаunclassified

“…3 b). Колебания скорости ползучести ранее наблюдали [10] для деформированного никелевого сплава. Как известно, в микроструктуре деформированных сплавов всегда содержится повышенная плотность дислокаций, что может вызывать движение и образование новых дислокаций с периодическим торможением движения дислокаций, обусловленным взаимодействием с дисперсными выделениями, способствуя некоторой нестабильности скорости ползучести.…”

Section: длительная прочность и сопротивление ползучести сплаваunclassified

“…При этом следует избегать значительного роста γ-зерен. По данным работ [7 -9], сохранение мелкозернистой структуры (d γ =10 -20 мкм) особенно важно для ступичной части дисков ГТД, от которой в процессе эксплуатации требуются одновременно высокая прочность, ударная вязкость, пластичность, сопротивление усталостному разрушению и термоциклическим нагрузкам [4,5,10].…”

Section: Introductionunclassified

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Long-term strength and creep resistance of a polycrystalline Re-containing nickel-based superalloy

et al. 2021

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The work was devoted to the study of the long-term strength and creep resistance of the recently developed heat resistant nickel-based superalloy SDZhS-15 intended for manufacturing of discs for gas turbine engines. The as-cast alloy was subjected to homogenization heat treatment, hot forging at subsolvus temperatures with intermediate annealing, solution treatment at various temperatures and aging or only to aging. A predominantly fine-grained structure was obtained in the workpieces after forging. It was revealed that solution treatment at T > T s − 50, where T s is the solvus temperature of the γ'-phase, led to a decrease in the volume fraction of the primary γ'-phase and an increase in the volume fraction of the γ' precipitates together with a significant growth of γ grains (up to d > 50 μm). Solution treatment at Т = T s − 50 allowed maintaining a relatively finegrained structure (d γ =10 -20 μm) and ensured the precipitation of the secondary γ'-phase with a size of about 0.1 μm upon cooling in air. Three microstructure conditions were obtained, for which long-term strength and creep resistance tests were performed in the range of temperatures 650 -850°C and stresses 400 -1200 MPa. The highest values of the long-term strength were achieved for a relatively fine-grained condition obtained after solution treatment at T s − 50 and aging. To evaluate the service life of the superalloy, the methodology based on the calculation of the Larson-Miller parameter was used. It was shown that the long-term strength (creep resistance) of the SDZhS-15 alloy in the optimal condition was higher as compared to the industrial disc nickel-based superalloys EP741NP and Udimet 720. Microstructure examination of the creep tested samples did not result in significant microstructure changes and especially in the formation of topologically close-packed phases. After creep tests, microcracks were observed along the grain / interphase boundaries, which apparently resulted from the development of boundary diffusion and sliding.

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Section: материал и методики экспериментаunclassified

Section: длительная прочность и сопротивление ползучести сплаваunclassified

Section: Introductionunclassified

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Long-term strength and creep resistance of a polycrystalline Re-containing nickel-based superalloy

et al. 2021

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Influence of Forging and Heat Treatment on the Microstructure and Mechanical Properties of a Heavily Alloyed Ingot-Metallurgy Nickel-Based Superalloy

Imayev

Mukhtarov

Mukhtarova

et al. 2020

Metals

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The newly designed ingot-metallurgy nickel-based superalloy SDZhS-15 intended for disc applications at operating temperatures up to 800–850 °C was subjected to homogenization annealing and canned forging at subsolvus temperatures, followed by solid solution treatment and ageing. Mostly a fine-grained recrystallized microstructure was obtained in the forgings. It was revealed that post-forging solid solution treatment at T > (Ts-50), where Ts is the γ′ solvus temperature, led to a significant γ grain growth, which in turn led to a decrease in strength and ductility of the superalloy. The solution treatment at (Ts-60)–(Ts-50) allowed to save fine γ grains (dγ = 10–20 μm) and to provide the formation of secondary γ′ precipitates with a size of around 0.1 μm. In the forged and heat-treated conditions, the superalloy demonstrated superior mechanical properties, particularly excellent creep resistance at 650–850 °C in the stress range of 400–1200 MPa. Microstructure examination of the creep-tested samples showed that a decrease in the creep resistance at 850 °C can be associated with enhanced diffusivity along γ grain and γ/γ′ interphase boundaries leading to formation of cracks along the boundaries. In spite of the heavy alloying, the topologically close-packed phases were not detected in the superalloy, including in the creep tested samples.

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Influences of a Hot-Working Process on the Microstructural Evolution and Creep Performance of a Spray-Formed Nickel-Based Superalloy

Cited by 2 publications

References 26 publications

Long-term strength and creep resistance of a polycrystalline Re-containing nickel-based superalloy

Long-term strength and creep resistance of a polycrystalline Re-containing nickel-based superalloy

Influence of Forging and Heat Treatment on the Microstructure and Mechanical Properties of a Heavily Alloyed Ingot-Metallurgy Nickel-Based Superalloy

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