Improved mechanical properties of Ti–6Al–4V alloy by electron beam welding process plus annealing treatments and its microstructural evolution |
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| Affiliation: | 1. Faculty of Mechanical Engineering, Ghulam Ishaq Khan Institute of Engineering Sciences and Technology, Topi 23640, Pakistan;2. Faculty of Materials and Chemical Engineering, Department of Material Science and Engineering, Ghulam Ishaq Khan Institute of Engineering Sciences and Technology, Topi 23640, Pakistan;3. Pakistan Welding Institute, PO box 1781, Islamabad, Pakistan;1. Advanced Forming Research Centre (AFRC), University of Strathclyde, 85 Inchinnan Drive, Inchinnan, Renfrewshire PA4 9LJ, UK;2. Rolls-Royce plc, PO Box 31, Elton Road, Derby, DE24 8ED, UK;3. Department of Materials Science and Engineering, The University of Sheffield, Mappin Street, Sheffield S1 3JD, UK |
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| Abstract: | In this study, we investigated the effect of post weld annealing treatments on the mechanical properties of a Ti–6Al–4V alloy following electron beam welding (EBW). The operational parameters used in this EBW process together with suitable annealing treatments appeared to substantially enhance the tensile properties of the Ti–6Al–4V weldment, suggesting that EBW is a promising method for industrial application. Moreover, we report for the first time that γ-TiAl + α2-Ti3Al formed in the fusion zone of the Ti–6Al–4V EBW weldment and exhibited the same lamellar structure, orientation relationship, deformation mechanism, and slip system as common Ti–Al-based alloys do. The presence of these intermetallic compounds affected the mechanical properties of the weldment. We discuss the related phase transformation, microstructural evolution, and characteristics of the precipitates formed. |
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| Keywords: | Ti–6Al–4V Electron beam welding Heat treatment Microstructure Intermetallic compounds Mechanical properties |
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