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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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Rugg, D.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (18/18 displayed)
- 2022Microstructural characterisation of deep cold rolled and metal shot peened Ti–6Al–4V plate
- 2022On the role of internal stresses on the superelastic behaviour of Ti-24Nb (at.%)
- 2021Quantifying the effect of oxygen on micro-mechanical properties of a near-alpha titanium alloycitations
- 2021Mechanisms of Ti3Al precipitation in hcp α-Ticitations
- 2020The influence of microstructural condition on the phase transformations in Ti-24Nb (at.%)
- 2020The kinetics of primary alpha plate growth in titanium alloyscitations
- 2020The effect of dissolved nitrogen on the fatigue behavior of Ti-6Al-4Vcitations
- 2020The Nature of the β→α″ Transformation in Ti-Nb Alloys
- 2019Characterizing solute hydrogen and hydrides in pure and alloyed titanium at the atomic scalecitations
- 2018Observation of a new B2 structured phase in Ti-15Mo (wt%)citations
- 2017Microscopic strain localisation in Ti-6Al-4V during uniaxial tensile loadingcitations
- 2017Microscopic strain localisation in Ti-6Al-4V during uniaxial tensile loadingcitations
- 2016In-service materials support for safety critical applications - A case study of a high strength Ti-alloy using advanced experimental and modelling techniquescitations
- 2016Understanding the "blue spot"citations
- 2013Texture and microstructure evolution of a zirconium alloy during uniaxial compression at 500°ccitations
- 2013Texture and microstructure evolution of a zirconium alloy during uniaxial compression at 500°ccitations
- 2012Residual stress fields after FOD impact on flat and aerofoil-shaped leading edgescitations
- 2012Residual stress fields after FOD impact on flat and aerofoil-shaped leading edgescitations
Places of action
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article
Understanding the "blue spot"
Abstract
<p>During hot component fatigue tests there have been two cases of low life crack initiation of gas turbine rotating parts manufactured from the Titanium alloy Ti-6246. Both exhibited a small (~0.1 mm) elliptical 'blue spot' at the origin. Through validated striation count work and fracture mechanics it was established that fatigue had propagated with a near-nil initiation life. Early investigation suggested that the 'blue spot' was possibly a region of stage 1 fatigue growth, and was therefore a material behaviour concern with potential implications for service. During an investigation of a later cracking incident in this alloy, subsequently shown to have resulted from stress-corrosion cracking (SCC), near-identical fractographic characteristics to that seen in the "blue spot" were found that subtly differentiated it from stage 1 fatigue. Also, similar 'blue spots' have since been identified on Ti6246 Laboratory hot LCF test specimens and found to have been due to contamination by NaCl, through the application of focussed long-term EDX examination and other novel chemical analyses techniques. By the application of those techniques, fractography, and comparison against these specimens, Rolls-Royce and Imperial College London have collaborated to show that the original two component 'blue spots' were subtle examples of NaCl-related Hot Salt Stress-Corrosion Cracking (HSSCC). Such cracking has not been found to occur in service components, due to air pressure within the engine, and the effect is therefore confined to Laboratory and component tests at near-atmospheric pressure or below.</p>