Towards customized heat treatments and mechanical properties in the LPBF-processed Ti-6Al-2Sn-4Zr-6Mo alloy

The Ti-6Al-2Sn-4Zr-6Mo alloy was recently successfully processed using the laser powder bed fusion technology. This material is characterized by a very low strength in as-built state, due to presence of α” martensite. In this work, transformations taking place at different temperatures were investigated with aim achieving necessary knowledge customize mechanical properties via heat treatments. Martensite decomposition, residual stress relaxation and β-transus temperature identified progressively increasing temperatures. Then, annealing treatments, corresponding identified, conducted. For each condition, dissimilar α + β microstructures obtained, varying terms morphology (lamellar, bi-lamellar) size laths (0.5–2.2 µm). tensile also significantly different. particular, outstanding values achieved when retained. higher temperatures, slight drop coupled an improvement ductility. Overall, most balanced combination obtained for 875 °C. bi-lamellar microstructure grants reduction slip length secondary laths.