Kaya, GurkanYildiz, FatihGuler, Fatih2026-03-262026-03-2620260997-75381873-728510.1016/j.euromechsol.2025.1058852-s2.0-105016787308https://doi.org/10.1016/j.euromechsol.2025.105885https://hdl.handle.net/20.500.14901/2803Kaya, Gürkan/0000-0002-1696-3202; Güler, Fatih/0000-0002-3647-6487The Laser Powder Bed Fusion method is a modern production technology that allows products with complex geometry to be produced. In parts produced with this method, surface roughness and defects such as voids and unmelted powders in the internal structure negatively affect the fatigue life of the part. Post-treatments are often needed to optimize the microstructure and obtain the required fatigue properties. This study examined how the mechanical properties were affected by heat treatment (HT) conducted both below and above the beta transformation temperature. The effects of HIP and electropolishing (EP) processes applied to Ti6Al4V-ELI alloys on fatigue behavior were examined. Residual stress values of untreated and post-treated samples were measured, and the results were interpreted. A significant decrease of approximately 10 times in the surface roughness values of fatigue samples was detected with the electropolishing process. The fatigue limit of the as-built (AB) samples was 150 MPa. After applying HT1+EP and HIP+EP post-treatments to the AB samples, the fatigue limit increased by approximately 3.6 and 3.9 times, respectively, compared to the untreated AB condition. Considering the fact that the fatigue limit values between the two groups are not very different and the high cost of the HIP process, it was evaluated that the HT1+EP process may be a more suitable post-treatment in terms of fatigue performance of additively manufactured parts.eninfo:eu-repo/semantics/closedAccessLaser Powder Bed FusionTi6Al4VFatigue PropertiesHipHeat TreatmentElectropolishArticle