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Metals 2016, 6(11), 284; doi:10.3390/met6110284

Microstructure and Wear Properties of Electron Beam Melted Ti-6Al-4V Parts: A Comparison Study against As-Cast Form

1
Singapore Centre for 3D Printing, School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
2
Singapore Institute of Manufacturing Technology, 73 Nanyang Drive, Singapore 637662, Singapore
*
Authors to whom correspondence should be addressed.
Academic Editor: Manoj Gupta
Received: 29 October 2016 / Revised: 12 November 2016 / Accepted: 15 November 2016 / Published: 18 November 2016
(This article belongs to the Special Issue 3D Printing of Metals)
View Full-Text   |   Download PDF [6448 KB, uploaded 18 November 2016]   |  

Abstract

Ti-6Al-4V (Ti64) parts of varying thicknesses were additively manufactured (AM) by the powder-bed-based electron beam melting (EBM) technique. Microstructure and wear properties of these EBM-built Ti-6Al-4V parts have been investigated in comparison with conventionally cast Ti64 samples. Sliding wear tests were conducted using a ball-on-disc micro-tribometer under ambient conditions. Experimental results reveal that EBM-built Ti64 samples exhibited higher microhardness and an overall larger coefficient of friction as compared to the as-cast counterpart. Of interest is that the corresponding specific wear volumes were lower for EBM-built Ti64 samples, while the as-cast Ti64 showed the poorest wear resistance despite its lower coefficient of friction. Wear mechanisms were provided in terms of quantitative microstructural characterization and detailed analysis on coefficient of friction (COF) curves. View Full-Text
Keywords: additive manufacturing; 3D printing; electron beam melting; titanium alloys; microstructure; wear properties additive manufacturing; 3D printing; electron beam melting; titanium alloys; microstructure; wear properties
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Toh, W.Q.; Wang, P.; Tan, X.; Nai, M.L.S.; Liu, E.; Tor, S.B. Microstructure and Wear Properties of Electron Beam Melted Ti-6Al-4V Parts: A Comparison Study against As-Cast Form. Metals 2016, 6, 284.

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