查看文章

Additive manufacturing of the Ti-6Al-4 V alloy is increasingly popular for making complex shaped parts. This alloy undergoes a transformation from the body-centred cubic β phase to the hexagonally close-packed α phase following solidification. There are currently gaps in the understanding of relationships between the processing conditions and the final material microstructure. In particular, the role of α variant selection mechanisms within additively manufactured parts is not well enough understood to assure product quality when varying processing parameters such as the scanning strategy. In this study, Ti-6Al-4 V samples were fabricated via the electron beam powder fusion (E-PBF) process under three different scanning strategies (linear scan, random and Dehoff point fills). Electron back-scatter diffraction revealed that the scanning strategy employed directly affects which variant selection mechanism …