Enhanced mechanical properties of Ti6Al4V alloy fabricated by laser additive manufacturing under static magnetic field

摘要

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-beta grains (strong orientation to weak orientation) and discontinuous alpha grain boundaries. The tensile test shows a significant improvement of tensile elongation (epsilon( f ) ) in both longitudinal and transverse directions with a slight strength decrease. @@@ IMPACT STATEMENT A magnetic field assisting laser additive manufacturing approach was developed to modulate the microstructure for Ti-6Al-4V alloy. The resulting refined beta grains and discontinuous alpha grain boundaries (GBs) improve the epsilon( f ) significantly.

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