Tratamientos térmicos de estructuras tipo giroide fabricadas en Ti6Al4V por manufactura aditiva

Abstract

Ti6Al4V is one of the most widely used titanium alloys due to its physical-mechanical and chemical properties for different industrial applications, including the biomedical and aeronautical industries. In the present work we present the fabrication by DMLS
additive manufacturing of a gyroid-type structure in Ti6Al4V that shows potential for structural applications. The gyroid-type structure samples were subjected to thermal treatments (TT) of solubilizing and aging (910°C/8h/WC) and annealing (800°C/4h,
850°C/3h, and 870°C/2h, with air cooling). Additionally, the study includes the metallographic analysis of the samples before and after the heat treatments applied. The results reveal that precipitation of stable and/or metastable phases occurs depending on the type of heat treatment applied to the samples. Tests of the mechanical properties of the samples before and after heat treatment were carried out in order to correlate the microstructure obtained with the mechanical properties induced in the material. It was found that the hardness, elastic modulus, and yield point depend on the type of heat treatment applied; for example, an increase in hardness and a reduction in ductility of the samples studied with an aging TT is presented.