Caracterização da liga Ti-64 produzida pelo processo direct metal laser sintering (DMLS) e estudo comparativo com outros processos de fabricação

Abstract

Throughout the years, many material production techniques have been developed with the objective of improving the properties required in materials applications, reducing process costs and increasing production speed and efficiency. In the face of numerous available techniques, in this work is proposed the microstructural characterization of Ti-64 (6% Al e 4% V) alloy produced by Direct Metal Laser Sintering (DMLS), and the evaluation of the production parameters change effect in final product characteristics. Furthermore the results were compared with others production techniques, because is very difficult find this kind of comparison in literature, like properties comparisons between the same material produced by different techniques. Optical and Scanning Electron Microscopy were used with the objective to analyze the superficial morphology and the samples microstructure produced by DMLS. Even if the production parameters change, it is observed that all samples microstructure are composed predominantly by martensite phase, however there is a porosity increase as long as the energy used during the process increase. The Electron Backscattering Diffraction (EBSD) technique was used to analyze structural morphology and to determine the β primary phase grains shape and orientation, showing the intertwined morphology of martensite phase and the β phase primary grains columnar origin.