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Reed, Roger
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Topics
Publications (10/10 displayed)
- 2015Linear friction welding of Ti6Al4V: experiments and modellingcitations
- 2015Validation of a Model of Linear Friction Welding of Ti6Al4V by Considering Welds of Different Sizescitations
- 2012The effect of hydrogen on porosity formation during electron beam welding of titanium alloys
- 2012Hydrogen Transport and Rationalization of Porosity Formation during Welding of Titanium Alloyscitations
- 2012A model for the creep deformation behaviour of nickel-based single crystal superalloyscitations
- 2012Coupled thermodynamic/kinetic model for hydrogen transport during electron beam welding of titanium alloycitations
- 2011Linear friction welding of Ti-6Al-4V: Modelling and validationcitations
- 2009Coupled modelling of solidification and solution heat treatment of advanced single crystal nickel base superalloycitations
- 2009Alloys-By-Design: Application to nickel-based single crystal superalloyscitations
- 2009Phase-field modelling of as-cast microstructure evolution in nickel-based superalloyscitations
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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.