Facile manipulation of mechanical properties of Ti-6Al-4V through composition tailoring in laser powder bed fusion

Ti-6Al-4 V alloy when processed by laser powder bed fusion (LPBF) is a useful material which can be used for the manufacture of complex 3D components aerospace and medical applications. LPBF fabricated typically shows high tensile strength (>1200 MPa) but poor ductility (<10%), explained characteristic microstructures that form under cooling rates multiple thermal cycles. Here, composition feedstock was modified via addition commercially pure Ti (CP Ti) to achieve improved parts through an in-situ composition, while maintaining good strength. The printed (with nominal Ti-3Al-2 V) showed ∼1000 MPa, with (∼13%), comparable wrought V. These properties are thought decreased c/a ratio (where c lattice parameters titanium hexagonal close-packed phase) resulting in enhanced dislocation slip. Good relative density also achieved using same processing parameters. Some non-uniform regions were seen developed alloys, as well evidence increased martensite α′ thickness. It proposed optimized parameters, further enhancements may achieved. This work has shown microstructural mechanical facilely manipulated proper CP addition.