Microstructure-Properties Relationships of Ti-6Al-4V Parts Fabricated by Selective Laser Melting

This work investigates the relationships between the static mechanical properties of Ti-6Al-4V manufactured through selective laser melting (SLM) and post-process heat treatments, namely stress relieve, annealing and hot isostatic pressing (HIP). In particular, Ti-6Al-4V parts were fabricated in thr...

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Bibliographic Details
Published in:International journal of precision engineering and manufacturing-green technology 2018-10, Vol.5 (5), p.605-612
Main Authors: Mezzetta, Justin, Choi, Joon-Phil, Milligan, Jason, Danovitch, Jason, Chekir, Nejib, Bois-Brochu, Alexandre, Zhao, Yaoyao Fiona, Brochu, Mathieu
Format: Article
Language:English
Subjects:
Annealing
Ductility
Heat treating
Heat treatment
Heat treatments
Hot isostatic pressing
Lamellar structure
Laser beam melting
Martensite
Martensitic transformations
Mechanical properties
Melting
Microstructure
Process heat
Tensile properties
Titanium base alloys
Ultimate tensile strength
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Summary:This work investigates the relationships between the static mechanical properties of Ti-6Al-4V manufactured through selective laser melting (SLM) and post-process heat treatments, namely stress relieve, annealing and hot isostatic pressing (HIP). In particular, Ti-6Al-4V parts were fabricated in three different build orientations of X, Z, and 45° to investigate the multi-directional mechanical properties. The results showed that fully densified Ti-6Al-4V parts with densities of up to 99.5% were obtained with optimized SLM parameters. The microstructure of stress relieved and mill annealed samples was dominated by fine α′ martensitic needles. After HIP treatment, the martensite structure was fully transformed into α and β phases (α+β lamellar). Within the realm of tensile properties, the yield and ultimate strength values were found statistically similar with respect to the built orientation for a given heat treatment. However, the ductility was found orientation dependent for the HIP samples, where a lower value was observed for samples built in the X direction.
ISSN:2288-6206
2198-0810
DOI:10.1007/s40684-018-0062-1