2015
DOI: 10.1098/rsta.2014.0128
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Microstructural aspects of fatigue in Ni-base superalloys

Abstract: Nickel-base superalloys are primarily used as components in jet engines and land-based turbines. While compositionally complex, they are microstructurally simple, consisting of small (50–1000 nm diameter), ordered, coherent Ni 3 (Al,Ti)-type L1 2 or Ni 3 Nb-type DO 22 precipitates (called γ ′ and γ ′′ , respectively) embedded in an FCC substitut… Show more

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Cited by 48 publications
(27 citation statements)
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References 80 publications
(135 reference statements)
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“…Based on this, assuming purely Lorentzian (Eq. [1]) or purely Gaussian profiles (Eq. [2]), the measured XRD peak width can be expressed as a superposition of two broadening components, one for size and the other for strain, respectively.…”
Section: A Breadth Methodsmentioning
confidence: 99%
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“…Based on this, assuming purely Lorentzian (Eq. [1]) or purely Gaussian profiles (Eq. [2]), the measured XRD peak width can be expressed as a superposition of two broadening components, one for size and the other for strain, respectively.…”
Section: A Breadth Methodsmentioning
confidence: 99%
“…Accordingly, in Eqs. [1] and [2], terms K/D and K 2 /D 2 account for size broadening, while e and e 2 account for strain broadening.…”
Section: A Breadth Methodsmentioning
confidence: 99%
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“…Towards the 'opposite' crystal/polycrystal/nanopolycrystal level of size scale, coverage is provided by Antolovich [47], Armstrong [48], Hohenwarter & Pippan [49], Ovid'ko [50] and Pineau [51]. Emphasis is given by these authors to the importance of crystal/grain boundaries.…”
mentioning
confidence: 99%
“…The surface roughness and residual stresses inherent to the manufacturing process or imposed by the surface treatment also affect the component lifetime (e.g., shot-and laser-peening, deep rolling). Owing to the complex thermal and mechanical repeated cyclic loading conditions during the engine service, the initial stress field may relax, be redistributed or evolve, particularly at high temperature (see [2] and references therein). Nonlinear elasto-viscoplastic models coupled to creep and a fatigue damage model [3] enable the identification of fatigue critical zones and crack initiation time, depending on the thermal and mechanical history of the disk [4].…”
mentioning
confidence: 99%