| Abstract Scope |
Laser-based Powder Bed Fusion (PBF-LB) technology holds promise for fabricating patient-specific medical implants. However, PBF-LB-produced Ti-6Al-4V alloys typically exhibit inferior corrosion resistance and ductility compared to conventionally manufactured counterparts due to metastable α′-martensite formation. This study proposes an in-situ heating strategy to enhance the corrosion resistance and mechanical properties of PBF-LB Ti-6Al-4V alloys. Specimens fabricated on substrates preheated to 500 and 700 °C formed more stable, protective passive films compared to room-temperature samples. At 500 °C, α′-martensite decomposed into ultra-fine α + β laths, while at 700 °C, slower cooling rates facilitated direct α + β phase formation. Notably, samples printed at 500 °C demonstrated superior corrosion resistance, improved ductility, and a more uniform microstructure compared to other samples, including wrought material. The results highlight that in-situ heating effectively enhances PBF-LB Ti-6Al-4V alloy properties through controlled martensite decomposition, offering improved performance and extended implant service life. |