Purpose - This paper aims to investigate the microstructural anisotropy of Ti-6Al-4V samples fabricated by selective laser melting.Design/methodology/approach - Specimens are fabricated through a Renishaw AM400 selective laser melting machine. Three microstructures(as-built, 850°C annealed and 1,050°C annealed) and two building orientations, parallel (PA) and perpendicular (PE) to the building platform, areconsidered. Starting from in-depth microscopic observations and comprehensive electron backscattered diffraction imaging, the study addressesnon-conventional techniques such as internal friction and electrical resistivity measurements to assess the anisotropy of the fabricated parts.Findings - Microscope observations highlight a fine texture with columnar grains parallel to the building direction in the as-built and 850°Cannealed samples. Besides, coarse grains characterized the 1,050°C annealed specimens. Internal friction measurements pointed out the presenceof internal stress while storage modulus analyses appear sensitive to texture. Electrical resistivity is resulted to be dependent on grain orientation.Originality/value - The work uses some novel characterization techniques to study the anisotropy and internal stresses of Ti-6Al-4V samplesprocessed by selective laser melting. Mechanical spectroscopy results suitable in this kind of study, as it mimics the operating conditions of thematerial.

Study of anisotropy through microscopy, internal friction and electrical resistivity measurements of Ti-6Al-4V samples fabricated by selective laser melting

Nespoli A
Primo
;
Bennato N;Villa E;Passaretti F
2022

Abstract

Purpose - This paper aims to investigate the microstructural anisotropy of Ti-6Al-4V samples fabricated by selective laser melting.Design/methodology/approach - Specimens are fabricated through a Renishaw AM400 selective laser melting machine. Three microstructures(as-built, 850°C annealed and 1,050°C annealed) and two building orientations, parallel (PA) and perpendicular (PE) to the building platform, areconsidered. Starting from in-depth microscopic observations and comprehensive electron backscattered diffraction imaging, the study addressesnon-conventional techniques such as internal friction and electrical resistivity measurements to assess the anisotropy of the fabricated parts.Findings - Microscope observations highlight a fine texture with columnar grains parallel to the building direction in the as-built and 850°Cannealed samples. Besides, coarse grains characterized the 1,050°C annealed specimens. Internal friction measurements pointed out the presenceof internal stress while storage modulus analyses appear sensitive to texture. Electrical resistivity is resulted to be dependent on grain orientation.Originality/value - The work uses some novel characterization techniques to study the anisotropy and internal stresses of Ti-6Al-4V samplesprocessed by selective laser melting. Mechanical spectroscopy results suitable in this kind of study, as it mimics the operating conditions of thematerial.
2022
Istituto di Chimica della Materia Condensata e di Tecnologie per l'Energia (ICMATE) - Sede Secondaria Lecco
Selective laser melting
Ti-6Al-4V
Internal friction
Electrical resistivity
Microscopy
Anisotropy
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.14243/440709
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