Hot Tensile Deformation Behavior of Ti-6Al-4V Titanium Alloy Made by Laser Melting Deposition

The combined process of additive manufacturing (AM) and subsequent hot forming technology enables the low-cost rapid complicated structures with local features that cannot be manufactured monolithically by traditional technologies. thermal deformation properties as-deposited materials from AM require investigation. In this paper, laser melting deposition (LMD) was used to prepare Ti-6Al-4V samples; high-temperature tensile tests for titanium alloy were performed at different strain rates (0.001 s−1, 0.005 0.01 s−1) temperatures (650 °C, 700 750 °C) using electrically assisted test system. results show material’s flow stress level negatively correlated temperature positively rate. EBSD TEM characterize microstructure samples. acicular martensite in original material began disintegrate under influence tension, coarsening lamella splitting boundary. proportion high-angle grain boundaries after increased significantly 81.4% 87.5–90.7%. micromorphology observations indicate micro-deformation mechanism deposited samples high is mostly discontinuous dynamic recrystallization spheroidization.