Characterization of oxidation mechanisms in a family of polycrystalline chromia-forming nickel-base superalloys

Lapington, M.T.; Crudden, D.J.; Reed, Roger C.; Moody, Michael P.; Bagot, Paul A.J.

doi:10.1016/j.actamat.2021.116626

Cited by 23 publications

(2 citation statements)

References 53 publications

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“…These studies have confirmed that there exists significant solubility for Ni, Al and Ti in chromia scales. Notably, Lapington et al [101] investigated the composition of chromia and alumina scales in Nb-bearing Ni-base superalloys, finding a small solubility for Nb and Ti in the bulk of both scales, and higher solubility at grain boundaries. Such grain boundary enrichment has been implicated in faster oxidation kinetics, and may contribute to the effects observed [53].…”

Section: Alloy 1 Alloy 2 Alloy 3 Alloymentioning

confidence: 99%

Oxidation Behaviour of New Nickel-Base Superalloys with Varying Aluminium: Niobium Ratio

Wise

Hardy

Church

et al. 2023

High Temperature Corrosion of mater.

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New Ni-base superalloys with higher temperature capability are required for future, more efficient gas turbine engines. In designing such alloys, careful consideration is required of the elemental concentrations to ensure that a suitable balance of mechanical properties and environmental resistance is obtained. In this study, the oxidation resistance of a series of new Ni-base superalloys with varying Al:Nb ratio has been assessed through long-term exposures in air at elevated temperature. The oxide scale has been characterised using scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction and quantitative measurements of oxide scale dimensions. The alloys were found to form continuous chromia scales at 700°C and outperformed several current commercial superalloys. However, following exposure at 800°C, significant microstructural degradation was observed due to precipitation of the δ phase.

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Section: Alloy 1 Alloy 2 Alloy 3 Alloymentioning

confidence: 99%

Oxidation Behaviour of New Nickel-Base Superalloys with Varying Aluminium: Niobium Ratio

Wise

Hardy

Church

et al. 2023

High Temperature Corrosion of mater.

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show abstract

“…The literature highlights that while increasing the Ti content can increase the activity of Cr, it increases the chromia scale growth rate by injecting vacancies [31,32] and can diffuse through the chromia scale along grain boundaries. [33] Al, Nb, and Ta contents can be increased in order to achieve the desired levels of c 0 without the inclusion of deleterious amounts of Ti. The contribution of Nb content must additionally be balanced in order to properly address the mechanical properties of the alloy since Nb and Ta increase the anti-phase boundary energy (APB) of c 0 and the ensuing flow stress of the alloy in the precipitate shear deformation regime.…”

Section: Implications For Design Of Oxidation Resistant Superalloys F...mentioning

confidence: 99%

Alloy Design for Additive Manufacturing: Early-Stage Oxidation of Nickel-Based Superalloys

Utada

Pedraza

Dick-Cleland³

et al. 2022

Metall Mater Trans A

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This body of work aims to inform alloy design for additive manufacturing by investigating the early-stage oxidation behavior of Ni-based superalloys processed by laser-powder bed fusion. The oxidation of 14 Ni-based superalloys—some novel and some heritage—at 1000 °C for 24 hours is studied through thermo-gravimetric analysis. The mass gain, oxide layer thickness, oxide scale composition, and $$\gamma ^\prime $$ γ ′ depletion zone size are measured. The influence of the alloy composition on these variables is assessed in order to elucidate how increasingly processable and oxidation resistant alloys can be developed. The alloy compositions with Al content greater than 9 at. pct form continuous Al2O3 scales at 1000 °C and display markedly lower parabolic rate constants, mass gain, oxide layer thickness, and $$\gamma ^\prime $$ γ ′ depletion zone size. The alloys of lesser Al content have reduced oxidation resistance and formed oxide scales of predominantly Cr2O3. Alloys with Ti content of 2.7 at. pct and greater formed Ti-rich oxide phases in their oxide scales as well as TiN subscale. A trade-off between alloy processability and oxidation resistance is identified, dictated by the deleterious effect of Al content on the ductility dip and the benefit of Al for oxidation resistance. A property space along the pareto front is highlighted which is ideal for having oxidation resistance and processability.

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A Novel Wrought Ni-Based Superalloy with High-Temperature Strength, Resistance to Creep Rupture, and Resistance to Oxidation

Bender,

De Vecchis,

Jankowski

2024

The Minerals, Metals &Amp; Materials Series

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Characterization of oxidation mechanisms in a family of polycrystalline chromia-forming nickel-base superalloys

Cited by 23 publications

References 53 publications

Oxidation Behaviour of New Nickel-Base Superalloys with Varying Aluminium: Niobium Ratio

Oxidation Behaviour of New Nickel-Base Superalloys with Varying Aluminium: Niobium Ratio

Alloy Design for Additive Manufacturing: Early-Stage Oxidation of Nickel-Based Superalloys

A Novel Wrought Ni-Based Superalloy with High-Temperature Strength, Resistance to Creep Rupture, and Resistance to Oxidation

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