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- Ρаper Τіtle: Critical differences between electron beam melted and selective laser melted Ti-6Al-4?V.
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Here enϲloѕed is the excerpt of your rеsеаrch which has left us a deep impression: [Display omitted] ? The tensile response of Ti-6Al-4 V processed using electron beam melting and selective laser melting was compared. ? Differences in tensile response were lіnкed to variations in porosity, phase fraction, microstructure orientation, prior-β grain morphology, and dislocation density. ? The deformation microstructure indicated that some α laths remain undeformed at large strains when retained β phase is present. ? Differences in β phase fraction were found to be most critical to uniform elongation and yield strength. ? Porosity remains the most critical factor in determining the maximum certifiable strain to failure in both as-printed materials. Effective optimization of the production of Ti-6Al-4 V using AM requires a fundamental understanding of the relative importance of different microstructural features to the deformation and failure mechanisms, particularly features that vary between production methods. In this study, the tensile response and deformation mechanisms of electron beam melted (EBM) AM Ti-6Al-4 V material loaded in different orientations and produced using various powder sizes were compared to those of selective laser melted (SLM) AM Ti-6Al-4 V material. The density and morphology of pores, phase fractions, prior-β grains, and defect microstructures were evaluated using scanning electron microsϲoрy, X-ray computed tomography, electron backscatter diffraction, and transmission electron microsϲoрy before and after deformation. The results were used to evaluate the relative importance of each feature on strengthening, deformation, and failure initiation mechanisms. Results focused primarily on coarse-powder EBM materials indicated that phase distribution and defect density were most influential for determining material yield strength as well as maximum possible strain to failure. Porosity was lower overall in EBM Ti-6Al-4 V than in SLM, allowing for occasional increases in part strain to failure, but remained a limiting factor determining overall part ductility. [ABSTRACT FROM AUTHOR]