Enhanced mechanical properties of Ti6Al4V alloy fabricated by laser additive manufacturing under static magnetic field
Ruixin Zhao, Chaoyue Chen, Sansan Shuai, Tao Hu, Yves Fautrelle, Hanlin Liao, Jian Lü, Jiang Wang, Zhongming Ren
Abstract
This study introduced a novel magnetic-field regulation method in metallic additive manufacturing to achieve the refined grain structure and enhanced mechanical properties without post-treatment and composition changes. As a showcase material, the Ti6Al4V alloy was fabricated using direct energy deposition under the static magnetic field (SMF). It is found that the transverse SMF of 0.55 T can effectively regulate the microstructure with twisted prior-β grains (strong <001> orientation to weak <110> orientation) and discontinuous α grain boundaries. The tensile test shows a significant improvement of tensile elongation (εf) in both longitudinal and transverse directions with a slight strength decrease.