Study of anisotropy through microscopy, internal friction and electrical resistivity measurements of Ti-6Al-4V samples fabricated by selective laser melting
ISSN: 1355-2546
Article publication date: 7 January 2022
Issue publication date: 23 May 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, are considered. Starting from in-depth microscopic observations and comprehensive electron backscattered diffraction imaging, the study addresses non-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°C annealed samples. Besides, coarse grains characterized the 1,050°C annealed specimens. Internal friction measurements pointed out the presence of 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 samples processed by selective laser melting. Mechanical spectroscopy results suitable in this kind of study, as it mimics the operating conditions of the material.
Keywords
Acknowledgements
Authors would like to thank the Comune di Lecco and the Camera di Commercio di Lecco for the agreement signed for the acquisition of the AM400 machine; authors also wish to acknowledge the support of Regione Lombardia within the project Future Homes For Future Communities (FHfFC). Authors are also grateful to Mr. Giordano Carcano and Dr. Denis De Martini for the kind technical assistance in the metallographic preparation of Ti6AL4V samples.
Citation
Nespoli, A., Bennato, N., Villa, E. and Passaretti, F. (2022), "Study of anisotropy through microscopy, internal friction and electrical resistivity measurements of Ti-6Al-4V samples fabricated by selective laser melting", Rapid Prototyping Journal, Vol. 28 No. 6, pp. 1060-1075. https://doi.org/10.1108/RPJ-06-2021-0151
Publisher
:Emerald Publishing Limited
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