| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Jiang, R.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (12/12 displayed)
- 2018Strain accumulation and fatigue crack initiation at pores and carbides in a SX superalloy at room temperaturecitations
- 2018A diffusion-based approach for modelling crack tip behaviour under fatigue-oxidation conditionscitations
- 2018Role of oxygen in enhanced fatigue cracking in a PM Ni-based superalloy : stress assisted grain boundary oxidation or dynamic embrittlment?citations
- 2018Role of oxygen in enhanced fatigue cracking in a PM Ni-based superalloy:Stress assisted grain boundary oxidation or dynamic embrittlment?citations
- 2018Role of oxygen in enhanced fatigue cracking in a PM Ni-based superalloycitations
- 2017Effects of oxygen-related damage on dwell-fatigue crack propagation in a P/M Ni-based superalloy : from 2D to 3D assessmentcitations
- 2017Direct, mold-less production systemscitations
- 2016Effects of oxidation on fatigue crack initiation and propafation in an advanced disk alloy
- 2016Realistic microstructure-based modelling of cyclic deformation and crack growth using crystal plasticitycitations
- 2015Realistic microstructure-based modelling of cyclic deformation and crack growth using crystal plasticitycitations
- 2014Grain size effects in a Ni-based turbine disc alloy in the time and cycle dependent crack growth regimescitations
- 2008730-nm optical parametric conversion from near- to short-wave infrared bandcitations
Places of action
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article
Grain size effects in a Ni-based turbine disc alloy in the time and cycle dependent crack growth regimes
Abstract
The fatigue crack growth (FCG) behaviour in a Ni-based turbine disc alloy with two grain sized variants, in a low solvus high refractory (LSHR) superalloy has been investigated under a range of temperatures (650–725 °C) and environments (air and vacuum) with trapezoidal waveforms of 1:1:1:1 and 1:20:1:1 durations at an R = 0.1. The results indicate that a coarse grained structure possesses better FCG resistance due to the enhanced slip reversibility promoted by planar slip as well as the reduction in grain boundary area. The fatigue performance of the LSHR superalloy is significantly degraded by the synergistic oxidation effect brought about by high temperature, oxidising environment and dwell at the peak load, associated with increasingly intergranular fracture features and secondary grain boundary cracking. Secondary cracks are observed to be blocked or deflected around primary c0, carbides and borides, and their occurrence closely relates to the roughness of the fracture surface, FCG rate and grain boundary oxidation. The apparent activation energy technique provides a further insight into the underlying mechanism of the FCG under oxidation–creep–fatigue testing conditions, and confirms that oxidation fatigue is the dominant process contributing to the intergranular failure process. At high enough crack growth rates, at lower temperatures, cycle dependent crack growth processes can outstrip crack-tip oxidation processes.