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Wang, Yushi; Yang, Guang; Zhou, Siyu; Sun, Cong; Li, Bobo; An, Da; Zhang, Shengnan; Xiu, Shichao
Materials science & engineering. A, Structural materials : properties, microstructure and processing, 12/2022, Volume: 861Journal Article
Ti–6Al–4V alloys fabricated by inside-beam powder feeding (IBPF) generally exhibit coarse columnar α-lath resulting in slightly poorer mechanical properties than forged parts. In this study, a laser remelting strategy with an annular beam was used to improve the microstructure and refine grain size, thus improving the mechanical properties of IBPF components. This is realized by the formation of ultrafine secondary precipitation αs and more recrystallized nuclei. The formation mechanism of compression twins {10 1‾ 1} and dislocation pinning effect in remelted layer were investigated in detail through TEM analysis. Furthermore, texture evolution and slip systems of the remelted layers were analyzed to determine the deformation patterns. Fine grain strengthening and dislocation strengthening was significant, and the tensile strength of Ti–6Al–4V components after laser remelting is higher than those fabricated by inside-beam powder feeding by about 12.7% and 9.3% in transverse and longitudinal directions, respectively.
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