Effect of Substrate Cooling on the Microstructure and Phase Composition of Ti–6Al–4V Titanium-Based Alloy Products Obtained Using Additive Technologies

The microstructure, phase composition, and parameters of α-Ti-based solid solutions in a Ti–6Al–4V alloy obtained by the 3D printing method without cooling and with water cooling of the titanium substrate are investigated using X-ray diffraction analysis, transmission diffraction and scanning electron microscopy, and optical metallography. It is found that water cooling of the substrate reduces the sizes of prior β-grains, increases the volume fraction of the β-phase, and decreases the volume fraction of the α"-phase and the total mean square displacement of atoms in the α-Ti crystal lattice, and also increases the elastic macrostrain of the samples.