Selective laser melting-fabricated Ti-6Al-4V alloy: Microstructural inhomogeneity, consequent variations in elastic modulus and implications

Cho, J, Xu, W, Brandt, M and Ma, Q 2018, 'Selective laser melting-fabricated Ti-6Al-4V alloy: Microstructural inhomogeneity, consequent variations in elastic modulus and implications', Optics and Laser Technology, vol. 111, pp. 664-670.


Document type: Journal Article
Collection: Journal Articles

Title Selective laser melting-fabricated Ti-6Al-4V alloy: Microstructural inhomogeneity, consequent variations in elastic modulus and implications
Author(s) Cho, J
Xu, W
Brandt, M
Ma, Q
Year 2018
Journal name Optics and Laser Technology
Volume number 111
Start page 664
End page 670
Total pages 7
Publisher Elsevier
Abstract Additively manufactured Ti-6Al-4V implants represent a premier application of metal additive manufacturing (AM) since 2007. Microstructural inhomogeneity can noticeably affect one or more aspects of their mechanical or biomedical performance. This paper investigates the microstructural inhomogeneity in selective laser melting (SLM)-fabricated Ti-6Al-4V using micro X-ray diffraction (mu-XRD) and the consequent changes in elastic modulus (concerns are trivial with other mechanical properties of SLM Ti-6A1-4V implants). Cylindrical specimens of 4)12 mm x 20 mm (few Ti-6Al-4V implants are thicker than 20 mm) were manufactured by SLM for detailed charaterization. mu-XRD (beam size: 500 mu m) was applied to 40 uniformly spaced regions at different build heights, assisted with microscopic examination. The distribution of lattice parameters for each phase was mapped out based on a detailed analysis of the mu-XRD two-dimensional (2D) diffraction data (ring patterns). The bottom half of the cylindrical specimen consisted of essentially alpha and beta while alpha'-martensite was prominent above the mid-height, with the top 3.5-mm thick region being fully martensitic. In relation to this, the elastic modulus was found to decrease almost linearly from the mid-build height to the top. It is further shown that the mu-XRD 2D ring patterns offered an improved approach to characterising the beta-phase in SLM Ti-6Al-4V. The implications of these findings are discussed explicitly.
Subject Manufacturing Processes and Technologies (excl. Textiles)
Metals and Alloy Materials
DOI - identifier 10.1016/j.optlastec.2018.08.052
Copyright notice © 2018 Elsevier Ltd. All rights reserved.
ISSN 0030-3992
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