Effect of thermomechanical treatment on the microstructure and mechanical properties of a novel heavily alloyed  nickel base superalloy

Imayev, V. M.; Mukhtarov, Shamil; Logunov, A. V.; Ganeev, Artem; Shakhov, Ruslan; Imayev, R. M.

doi:10.22226/2410-3535-2019-2-249-254

Cited by 7 publications

(4 citation statements)

References 3 publications

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“…As was earlier shown for another heavily alloyed nickel-based superalloy [13,14], the fractional forging with intermediate recrystallization annealings contributed to a uniform development of recrystallization. In the present work, threestage forging at 1225 -1200°C with intermediate recrystallization annealings at 1200°C was applied to produce fine-grained workpieces.…”

Section: Hot Working and Tensile Propertiessupporting

confidence: 63%

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Effect of hot working on the microstructure and tensile properties of a novel PM Re-bearing nickel base superalloy

Mukhtarov

Karyagin²,

Logunov

et al. 2022

Lett. Mater.

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The work is devoted to study of an experimental PM nickel-based superalloy Ni-16(Al, Ti, Nb, Ta)-30(Cr, Co, Mo, Hf, W, Re) (wt.%). The initial as-HIP' ed material was prepared as cylinders with a size of ∅100 × 200 mm. The hot workability of the superalloy was evaluated by compression tests of small samples under isothermal conditions. The tests were performed at temperatures of 1150 -1240°C with a strain rate of έ =10 −4 -10 −1 s −1 . Some samples were subjected to preliminary homogenization annealing. Examination of the deformed samples by SEM made it possible to define the hot working conditions providing development of recrystallization processes and formation of a uniform fine-grained structure. It was established that preliminary homogenization of as-HIP' ed material followed by fractional forging with intermediate recrystallization annealings in the temperature range of (T s − 40) -(T s −15), where T s is the γ' solvus temperature, provided a uniform development of recrystallization. The obtained forgings were subjected to ageing or solid solution treatment and ageing. In the fine-grained condition obtained by hot working and heat treatment, the material exhibited tensile properties comparable to the best properties achievable in disc nickel-based superalloys.

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Section: Hot Working and Tensile Propertiessupporting

confidence: 63%

“…Therefore, rhenium is known to increase significantly the creep rupture life in the case of single-crystal superalloys [2]. The positive influence of rhenium on mechanical properties has recently also been demonstrated in a polycrystalline nickel-based superalloy [13,14].…”

Section: Introductionmentioning

confidence: 98%

Effect of hot working on the microstructure and tensile properties of a novel PM Re-bearing nickel base superalloy

Mukhtarov

Karyagin²,

Logunov

et al. 2022

Lett. Mater.

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“…Для полученных состояний сплава были выполнены испытания на длительную прочность (сопротивление ползучести) в диапазоне температур 650 -850°С и нагрузок 350 -1200 МПа. Для этого из термически обработанных заготовок были изготовлены плоские образцы с размерами рабочей части 17 × 3 × 3 мм 3 . Образцы перед испытаниями механически шлифовали.…”

Section: материал и методики экспериментаunclassified

“…Одним из недавно разработанных дисковых ЖНС является сплав СДЖС-15. Для этого сплава ранее были разработаны условия гомогенизационной обработки и дробной деформационно-термической обработке (ДТО) в (γ+γ')-области с промежуточными отжигами, которые позволили получить поковки с преимущественно рекристаллизованной мелкозернистой структурой [2,3]. Сплав даже в деформированном мелкозернистом состоянии (после старения) показал повышенные механические свойства в сравнении с известными дисковыми ЖНС [2].…”

Section: Introductionunclassified

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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Effect of post-forging heat treatment on the microstructure and mechanical properties of a nickel-base superalloy SDZhS-15

Mukhtarova

Shakhov

Ganeev

et al. 2020

IOP Conf. Ser.: Mater. Sci. Eng.

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The newly designed ingot-metallurgy Ni-base superalloy SDZhS-15 intended for disc applications was subjected to multiple heat treatment and forging in the temperature range (Ts-70)-Ts, where Ts is the γ’ solvus temperature, followed by solid solution treatment and ageing. A fine-grained microstructure was attained in the forged condition as a result of recrystallization processes occurring during processing. It was revealed that solution treatment at T>(Ts-50) led to a fast γ grain growth, which in turn led to a decrease in strength and ductility of the superalloy. At the same time, the solution treatment at slightly lower temperatures, at (Ts-60)-(Ts-50), allowed to save fine γ grains (d γ = 10-20 μm) and to provide the formation of secondary γ′ precipitates with a mean size of about 0.1 The superalloy in the forged and heat treated condition showed superior mechanical properties as compared with those of other disc superalloys.

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Effect of thermomechanical treatment on the microstructure and mechanical properties of a novel heavily alloyed nickel base superalloy

Cited by 7 publications

References 3 publications

Effect of hot working on the microstructure and tensile properties of a novel PM Re-bearing nickel base superalloy

Effect of hot working on the microstructure and tensile properties of a novel PM Re-bearing nickel base superalloy

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

Effect of post-forging heat treatment on the microstructure and mechanical properties of a nickel-base superalloy SDZhS-15

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