Coarse columnar β grains result in anisotropic mechanical properties in Ti alloys deposited by additive manufacturing.This study reports that Ti-6Al-4V alloy fabricated by coaxial electron beam wire feeding additive manufacturing presents a weak anisotropy,high strength and ductility.The superior tensile property arises from a microstructure with fine equiaxed β grains(EGβ),discontinuous grain boundary α phase and short intragranular α lamellae.A large region of fine EGβ arises from a special combination of the temperature gradient and solidification rate,and attractive α morphology is caused by solid phase transformations during interpass thermal cycling and post heat treatments.