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Texture and Twinning in Selective Laser Melting Ti-6Al-4V Alloys
Martensitic texture-phase transition in Selective Laser Melting (SLM) Ti-6Al-4V (ELI) alloys was found. Electron Backscatter Diffraction (EBSD) analysis showed the initial cubic beta < 100 > (001) BCC texture. Such kind of texture is observed in BCC metals with flat rolling texture when axis is in the direction of rolling and the texture plane coincides with the plane of rolling. It was found that the texture of the parent BCC beta-phase determined the texture of low-temperature HCP alpha-phase limited the choice of its orientation variants. The {10-12} < -1011 > twinning system in titanium alloys after SLM was determined. Analysis of the oxygen contamination in SLM alloys was done. Comparison of the obtained results with the conventional titanium alloys is also provided.
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[1] A.M. Beese, B.E. Carroll,” Review of mechanical properties of Ti-6Al-4V made by laser-based additive manufacturing using powder feedstock”, JOM, vol. 68, pp. 724-734, 2016.
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