The role of alloying elements in the design of nickel-base superalloys

Jena, A. K.; Chaturvedi, M.C.

doi:10.1007/bf00549796

Cited by 318 publications

(121 citation statements)

References 40 publications

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“…These results were consistent with the established elemental partitioning behavior between the phases of commercial Ni-based superalloys. [18] There is good agreement between the experimentally determined STEM-EDX and APT data for all elements, with differences typically lying within the range of experimental uncertainty. With increasing aging time, the concentration of each element was observed to be approximately constant and generally corresponded well with the equilibrium concentrations predicted by ThermoCalc.…”

Section: Resultsmentioning

confidence: 55%

Gamma Prime Precipitate Evolution During Aging of a Model Nickel-Based Superalloy

Goodfellow

Galindo-Nava

Christofidou

et al. 2017

Metall Mater Trans A

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The microstructural stability of nickel-based superalloys is critical for maintaining alloy performance during service in gas turbine engines. In this study, the precipitate evolution in a model polycrystalline Ni-based superalloy during aging to 1000 hours has been studied via transmission electron microscopy, atom probe tomography, and neutron diffraction. Variations in phase composition and precipitate morphology, size, and volume fraction were observed during aging, while the constrained lattice misfit remained constant at approximately zero. The experimental composition of the γ matrix phase was consistent with thermodynamic equilibrium predictions, while significant differences were identified between the experimental and predicted results from the γ′ phase. These results have implications for the evolution of mechanical properties in service and their prediction using modeling methods.

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Section: Resultsmentioning

confidence: 55%

Gamma Prime Precipitate Evolution During Aging of a Model Nickel-Based Superalloy

Goodfellow

Galindo-Nava

Christofidou

et al. 2017

Metall Mater Trans A

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“…Tantalum has played an important role in the development of complex concentrated multicomponent superalloys as both a solid-solution strengthener and a precipitate former [1][2][3][4]. The addition of Ta to superalloys increases the high-temperature strength and ductility, and the resistance to creep, fatigue, and corrosion, of these high-performance materials [2,5].…”

Section: Introductionmentioning

confidence: 99%

“…The addition of Ta to superalloys increases the high-temperature strength and ductility, and the resistance to creep, fatigue, and corrosion, of these high-performance materials [2,5]. While the effects of Ta on the microstructure and mechanical properties of superalloys [5][6][7][8][9][10] have been studied, little work has been done to characterize the morphological and compositional changes due to the addition of Ta.…”

Section: Introductionmentioning

confidence: 99%

“…The addition of Cr to the binary Ni-Al system reduces the lattice parameter misfit between the γ'-precipitates and the γ-matrix, allowing the γ'-precipitates to remain spherical or spheroidal to fairly large dimensions as aging progresses [11]. The addition of Ta has been shown to provide significant strengthening by increasing the volume fraction of the γ'-precipitate phase, while also decreasing the inter-diffusivity between phases, improving phase stability and service life [2,3].…”

Section: Introductionmentioning

confidence: 99%

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Effects of a Tantalum Addition on the Morphological and Compositional Evolution of a Model Ni-Al-Cr Superalloy

Booth-Morrison

Noebe

Seidman

et al. 2008

Superalloys 2008 (Eleventh International Symposium)

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The effects of a 2.0 at.% addition of Ta to a model Ni-Al-Cr superalloy aged at 1073 K are assessed using scanning electron microscopy and atom-probe tomography. The addition of Ta results in appreciable strengthening, and the morphology is found to evolve from a bimodal distribution of spheroidal precipitates, to cuboidal precipitates aligned along the elastically soft <001>-type directions. Tantalum is observed to partition preferentially to the γ'-precipitate phase and decreases the mobility of Ni in the γ-matrix sufficiently to cause an accumulation of Ni on the γ-matrix side of the γ'-precipitate/γ-matrix heterophase interface.

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“…The influence of the major alloy constituents on behaviour is discussed in the following text. It has been established that strength is derived from solid solution strengthening and γ' precipitates 8,9 , the degree of strengthening being a function of the size and concentration of solute atoms and the volume fraction and size of γ' precipitates. The contribution to strength of lattice misfit strain from solute atoms, and the perceived patent restrictions in using tungsten have resulted in high levels of aluminium, molybdenum, chromium and cobalt in RR1000.…”

Section: Alloy Compositionmentioning

confidence: 99%

Developing Damage Tolerance and Creep Resistance in a High Strength Nickel Alloy for Disc Applications

Hardy¹,

Zirbel²,

Shen³

et al. 2004

Superalloys 2004 (Tenth International Symposium)

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The development of an affordable nickel disc alloy that shows the required combination of strength, damage tolerance and creep resistance continues to challenge materials engineers. RollsRoyce has developed the alloy known as RR1000, which when processed to produce a fine grain microstructure, shows at least a 25ºC increase in temperature capability over the current disc alloy, 720Li, and has an equivalent crack growth resistance to coarse grain Waspaloy. This paper discusses the steps that were taken to attain these mechanical properties, and also examines the potential to increase temperature capability by a further 30ºC through the development of a coarse microstructure in selected areas of disc forgings.

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The role of alloying elements in the design of nickel-base superalloys

Cited by 318 publications

References 40 publications

Gamma Prime Precipitate Evolution During Aging of a Model Nickel-Based Superalloy

Gamma Prime Precipitate Evolution During Aging of a Model Nickel-Based Superalloy

Effects of a Tantalum Addition on the Morphological and Compositional Evolution of a Model Ni-Al-Cr Superalloy

Developing Damage Tolerance and Creep Resistance in a High Strength Nickel Alloy for Disc Applications

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