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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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Strangwood, Martin
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (19/19 displayed)
- 2020Sports Materialscitations
- 2019Grain growth on reheating for an as-cast Al-Nb-containing steel with segregated compositioncitations
- 2019Effect of grain size distribution on recrystallisation kinetics in an Fe-30Ni model alloycitations
- 2018Characterisation of precipitation and coarsening of carbides during tempering in a low alloyed quenched and tempered steelcitations
- 2018Characterisation of precipitation and carbide coarsening in low carbon low alloy Q&T steels during the early stages of temperingcitations
- 2017Skeletonisation to Find the Centre of Dendrites Traced from a 2D Microstructural Image
- 2016Effect of grain size distribution on recrystallisation kinetics in a Fe-30Ni model alloy
- 2015Electromagnetic evaluation of the microstructure of grade 91 tubes/pipescitations
- 2014Stereologische Analyse der mikrostrukturellen Inhomogenitäten in durch Kokillenguss mit Direktkühlung und durch konventionellen Strangguss verarbeiteten Aluminium-Magnesium-Legierung (AA5754)
- 2013The effect of hydrogen on porosity formation during electron beam welding of titanium alloys
- 2013Magnetic evaluation of microstructure changes in 9Cr-1Mo and 2.25Cr-1Mo steels using electromagnetic sensorscitations
- 2012The effect of hydrogen on porosity formation during electron beam welding of titanium alloys
- 2012On the mechanism of porosity formation during welding of titanium alloyscitations
- 2012Hydrogen Transport and Rationalization of Porosity Formation during Welding of Titanium Alloyscitations
- 2012Coupled thermodynamic/kinetic model for hydrogen transport during electron beam welding of titanium alloycitations
- 2009Microstructure-property development in friction stir welds of Al-Mg alloys
- 2007Microstructure-microhardness relationships in friction stir welded AA5251citations
- 2007Influence of base metal microstructure on microstructural development in aluminium based alloy friction stir weldscitations
- 2005Microstructural development during friction stir welding of work hardenable Al-Mg alloys
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document
The effect of hydrogen on porosity formation during electron beam welding of titanium alloys
Abstract
Titanium and its alloys are prone to hydrogen-assisted porosity formation during welding, but this effect is not yet sufficiently understood. Research aimed at elucidating the behaviour of hydrogen during electron beam welding of Ti- 6Al-4V is presented. Characterisation is carried out using high resolution X-ray tomography, residual gas analysis and metallographic sectioning; this confirms that porosity formation is associated with hydrogen evolution. To quantify the dependence between porosity formation and hydrogen content in the base material, a hydrogen diffusion-controlled bubble growth model is used to simulate bubble growth in the melt, and thus to make predictions of the hydrogen concentration barrier needed for pore formation. The modeling results are supported up by experimentation on Ti-6Al-4V of different hydrogen levels, achieved by electrochemical charging. The results confirm that vigorous hydrogen degassing happens at high hydrogen levels. But porosity can be suppressed when welding is carried out with optimized welding parameters and perfect joint alignment; on the other hand, porosity is exacerbated when a small beam offset is employed. The influence of beam offset on porosity formation is discussed. It would appear that the nucleation rate in the liquid zone at the melting front determines the likelihood of porosity occurrence.