Microstructure and mechanical behaviour of additive manufactured Ti–6Al–4V parts under tension
Institute of Strength Physics and Materials Science of the SB RAS, 634055 Tomsk, Russia
2 Baikov Institute of Metallurgy and Materials Science of RAS, 19334 Moscow, Russia
3 A.V. Luikov Heat and Mass Transfer Institute of NAS of Belarus, 220072 Minsk, Belarus
4 SSPA “Center” NAS of Belarus, 220072 Minsk, Belarus
5 Tecnological Design Institute of Scientific Instrument Engineering, 630058 Novosibirsk, Russia
* Corresponding author: firstname.lastname@example.org
Published online: 30 October 2019
Metal-based additive manufacturing technologies using electron or laser beams as a heat source for melting a metal powder or wire have been the subject of keen interest in recent years. At present paper a comparative analysis of the microstructure, strain response during tensile test and mechanical properties of Ti–6Al–4V samples produced by selective laser melting, electron beam melting or electron beam free-form fabrication were performed. A microstructural study using transmission electron microscopy revealed columnar prior β grains transformed into a lamellar α-morphology in the samples. According to X-ray diffraction study, the volume fractions of the β-Ti phase in the samples were equal to 2, 4 and 6 % respectively. It has been shown that the Vickers microhardness of SLM and EBM Ti–6Al–4V samples was similar (~5.4 GPa) while the hardness of EBF3 parts was significantly lower (4.5 GPa). The uniaxial stress-strain response of the Ti–6Al–4V samples fabricated by different additive manufacturing technologies were compared. Crystallographic (dislocation motion) and non-crystallographic (shear banding) deformation mechanisms of the loaded samples were studied by scanning electron microscopy and optical profilometry.
© The Authors, published by EDP Sciences, 2019
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