| 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
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article
Strain accumulation and fatigue crack initiation at pores and carbides in a SX superalloy at room temperature
Abstract
Pores and carbides inherited from SX superalloy manufacturing processes usually act as stress concentrators and are preferential sites for fatigue crack initiation. In this study, pore & carbide size, morphology and distribution in a SX superalloy MD2 has been evaluated by X-ray CT. Strain accumulation and fatigue cracking behaviour in MD2, particularly around the pores and carbides, has been investigated by ex-situ SEM-DIC at room temperature along with image-based modelling of the observed MD2 defect populations obtained through X-ray CT imaging. The deformation structures have also been examined by electron channelling contrast imaging under controlled diffraction conditions. The results indicate that the pores & carbides with complicated three-dimensional features are the dominant fatigue crack initiation sites. Deformation is concentrated within intense slip bands and an enhanced strain accumulation around pores is captured by SEM-DIC. Dislocation motion is mainly confined to the γ matrix channels with some dislocation shear cutting of γ′ precipitates also observed ahead of the crack tip. As the crack propagates, strain band density and dislocation density at the crack tip increases correspondingly. Image-based modelling using the observed defect populations in MD2 (micro)structure can effectively predict the stress concentrations and the resultant hot spot for subsequent fatigue crack initiation, which is consistent with the experimental observations.