Oxidation-assisted creep damage in a wrought nickel-based superalloy: Experiments and modelling

Château, Emmanuel; Rémy, Luc

doi:10.1016/j.msea.2009.10.054

Cited by 55 publications

(15 citation statements)

References 29 publications

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“…Regarding the failure at grain boundaries, a related study on Nibase superalloys at elevated temperature has revealed that the crack propagation is due to the fracture of heavily oxidized grain boundaries where carbon precipitates exist [26,27].…”

Section: Fractographymentioning

confidence: 99%

Creep-fatigue behavior of turbine disc of superalloy GH720Li at 650 °C and probabilistic creep-fatigue modeling

Shang

et al. 2016

Materials Science and Engineering: A

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Section: Fractographymentioning

confidence: 99%

Creep-fatigue behavior of turbine disc of superalloy GH720Li at 650 °C and probabilistic creep-fatigue modeling

Shang

et al. 2016

Materials Science and Engineering: A

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“…The hyperbolic sine formulation represents a more mechanistic approach to defining the inelastic strain-rate [31] and has been successfully applied to a range of materials under creep [32][33][34][35] and fatigue [36,37]. For 9Cr steels, Barrett and co-workers [19,30] have shown that the hyperbolic sine function enables reliable interpolation and extrapolation from higher strain-rates in laboratory tests to the intermediate and lower strain-rates relevant to flexible operation of power plants [13].…”

mentioning

confidence: 99%

A physically-based constitutive model for high temperature microstructural degradation under cyclic deformation

Barrett

O’Donoghue

Leen

2017

International Journal of Fatigue

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This paper presents a dislocation-mechanics cyclic viscoplasticity model which incorporates the key physical micro-mechanisms of strengthening and softening for high temperature deformation of 9Cr steels. In particular, these include precipitate and grain boundary strengthening, low-angle boundary dislocation annihilation and martensitic lath width evolution, using dislocation density as a key state variable. The new model is applied to P91 steel across a range of strain-rates, strain-ranges and temperatures in the range 400 °C to 600 °C, for power plant header applications, to demonstrate the effect of key microstructural parameters on high temperature low cycle fatigue performance.

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“…In fact, due to the start-up and shut-down operations, transient temperature gradients occur, giving rise to combined thermal and mechanical loading [ 95 ], and therefore to thermal mechanical fatigue (TMF) and low cycle fatigue (LCF) [ 95 , 96 ]. High-temperature LCF in nickel-based alloys under air results in the formation of a complex oxide layer and a reaction zone depleted of strengthening precipitates in the adjacent substrate as in creep [ 97 ]. Under thermal transients, oxidation embrittlement can occur, therefore high-temperature LCF tests and TMF life prediction of alloys (coated and uncoated) for high-pressure turbine blades are mandatory [ 98 ].…”

Section: Coatings For Ni- and Ti-based Alloys For Aerospace Enginementioning

confidence: 99%

Critical Raw Materials Saving by Protective Coatings under Extreme Conditions: A Review of Last Trends in Alloys and Coatings for Aerospace Engine Applications

et al. 2021

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Several applications where extreme conditions occur require the use of alloys often containing many critical elements. Due to the ever increasing prices of critical raw materials (CRMs) linked to their high supply risk, and because of their fundamental and large utilization in high tech products and applications, it is extremely important to find viable solutions to save CRMs usage. Apart from increasing processes’ efficiency, substitution, and recycling, one of the alternatives to preserve an alloy and increase its operating lifetime, thus saving the CRMs needed for its manufacturing, is to protect it by a suitable coating or a surface treatment. This review presents the most recent trends in coatings for application in high temperature alloys for aerospace engines. CRMs’ current and future saving scenarios in the alloys and coatings for the aerospace engine are also discussed. The overarching aim of this paper is to raise awareness on the CRMs issue related to the alloys and coating for aerospace, suggesting some mitigation measures without having the ambition nor to give a complete overview of the topic nor a turnkey solution.

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Oxidation-assisted creep damage in a wrought nickel-based superalloy: Experiments and modelling

Cited by 55 publications

References 29 publications

Creep-fatigue behavior of turbine disc of superalloy GH720Li at 650 °C and probabilistic creep-fatigue modeling

Creep-fatigue behavior of turbine disc of superalloy GH720Li at 650 °C and probabilistic creep-fatigue modeling

A physically-based constitutive model for high temperature microstructural degradation under cyclic deformation

Critical Raw Materials Saving by Protective Coatings under Extreme Conditions: A Review of Last Trends in Alloys and Coatings for Aerospace Engine Applications

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