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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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Mccolvin, G.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (10/10 displayed)
- 2019Initiation and growth of short cracks in a nickel-based single crystal superalloy
- 2019Low-cycle fatigue of single crystal nickel-based superalloy – mechanical testing and TEM characterisationcitations
- 2019In-situ SEM study of slip-controlled short-crack growth in single-crystal nickel superalloycitations
- 2017Low cycle fatigue of a directionally solidified nickel-based superalloy: Testing, characterisation and modellingcitations
- 2017Low cycle fatigue of a directionally solidified Nickel-based superalloy : testing, characterisation and modellingcitations
- 2017Computational Modelling of Full Interaction between Crystal Plasticity and Oxygen Diffusion at a Crack Tipcitations
- 2016Stress relaxation of nickel-based superalloy helical springs at high temperaturescitations
- 2010Microstructural Evolution in High Temperature Creep and Thermally Aged HA230
- 2005Manufacture and microstructural characterisation of bimetallic gas turbine discscitations
- 2005Advanced high temperature turbine seals materials and designs
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article
Low cycle fatigue of a directionally solidified nickel-based superalloy: Testing, characterisation and modelling
Abstract
The file attached to this record is the author's final peer reviewed version. The Publisher's final version can be found by following the DOI link. ; open access article ; Low cycle fatigue (LCF) of a low-carbon (LC) directionally-solidified (DS) nickel-base superalloy, CM247 LC DS, was investigated using both experimental and computational methods. Strain-controlled LCF tests were conducted at 850°C, with a loading direction either parallel or perpendicular to the solidification direction. Trapezoidal loading-waveforms with 2 s and 200 s dwell times imposed at the minimum and the maximum strains were adopted for the testing. A constant strain range of 2% was maintained throughout the fully-reversed loading conditions (strain ratio R = −1). The observed fatigue life was shorter when the loading direction was perpendicular to the solidification one, indicating an anisotropic material response. It was found that the stress amplitude remained almost constant until final fracture, suggesting limited cyclic hardening/softening. Also, stress relaxation was clearly observed during the dwell period. Scanning Electron Microscopy fractographic analyses showed evidence of similar failure modes in all the specimens. To understand deformation at grain level, crystal plasticity finite element modelling was carried out based on grain textures measured with EBSD. The model simulated the full history of cyclic stress-strain responses. It was particularly revealed that the misorientations between columnar grains resulted in heterogeneous deformation and localised stress concentrations, which became more severe when the loading direction was normal to a solidification direction, explaining the shorter fatigue life observed.