Abstract
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.
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Levy, G. N., “The Role and Future of the Laser Technology in the Additive Manufacturing Environment,” Physics Procedia, Vol. 5, pp. 65–80, 2010.
Gibson, I., Rosen, D. W., and Stucker, B., “Additive Manufacturing Technologies,” Springer, 2014.
Levy, G. N., Schindel, R., and Kruth, J.-P., “Rapid Manufacturing and Rapid Tooling with Layer Manufacturing (LM) Technologies, State of the Art and Future Perspectives,” CIRP Annals-Manufacturing Technology, Vol. 52, No. 2, pp. 589–609, 2003.
Kruth, J.-P., Levy, G., Klocke, F., and Childs, T., “Consolidation Phenomena in Laser and Powder-Bed Based Layered Manufacturing,” CIRP Annals, Vol. 56, No. 2, pp. 730–759, 2007.
Ahn, D.-G., “Direct Metal Additive Manufacturing Processes and their Sustainable Applications for Green Technology: A Review,” International Journal of Precision Engineering and Manufacturing-Green Technology, Vol. 3, No. 4, pp. 381–395, 2016.
Simonelli, M., Tse, Y. Y., and Tuck, C., “Effect of the Build Orientation on the Mechanical Properties and Fracture Modes of SLM Ti-6Al-4V,” Materials Science and Engineering: A, Vol. 616, pp. 1–11, 2014.
Vandenbroucke, B. and Kruth, J.-P., “Selective Laser Melting of Biocompatible Metals for Rapid Manufacturing of Medical Parts,” Rapid Prototyping Journal, Vol. 13, No. 4, pp. 196–203, 2007.
Qiu, C., Adkins, N. J., and Attallah, M. M., “Microstructure and Tensile Properties of Selectively Laser-Melted and of Hiped Laser-Melted Ti-6Al-4V,” Materials Science and Engineering: A, Vol. 578, pp. 230–239, 2013.
Thijs, L., Verhaeghe, F., Craeghs, T., Van Humbeeck, J., and Kruth, J.-P., “A Study of the Microstructural Evolution during Selective Laser Melting of Ti-6Al-4V,” Acta Materialia, Vol. 58, No. 9, pp. 3303–3312, 2010.
Aboulkhair, N. T., Everitt, N. M., Ashcroft, I., and Tuck, C., “Reducing Porosity in AlSi10Mg Parts Processed by Selective Laser Melting,” Additive Manufacturing, Vol. 1, pp. 77–86, 2014.
Leuders, S., Thöne, M., Riemer, A., Niendorf, T., Tröster, T., et al., “On the Mechanical Behaviour of Titanium Alloy TiAl6V4 Manufactured by Selective Laser Melting: Fatigue Resistance and Crack Growth Performance,” International Journal of Fatigue, Vol. 48, pp. 300–307, 2013.
Vrancken, B., Thijs, L., Kruth, J.-P., and Van Humbeeck, J., “Heat Treatment of Ti-6Al-4V Produced by Selective Laser Melting: Microstructure and Mechanical Properties,” Journal of Alloys and Compounds, Vol. 541, pp. 177–185, 2012.
Wauthle, R., Vrancken, B., Beynaerts, B., Jorissen, K., Schrooten, J., et al., “Effects of Build Orientation and Heat Treatment on the Microstructure and Mechanical Properties of Selective Laser Melted Ti-6Al-4V Lattice Structures,” Additive Manufacturing, Vol. 5, pp. 77–84, 2015.
Donachie, M. J., “Titanium: A Technical Guide,” ASM International, 2000.
Xu, W., Brandt, M., Sun, S., Elambasseril, J., Liu, Q., et al., “Additive Manufacturing of Strong and Ductile Ti-6Al-4V by Selective Laser Melting via in Situ Martensite Decomposition,” Acta Materialia, Vol. 85, pp. 74–84, 2015.
Rafi, H., Karthik, N., Gong, H., Starr, T. L., and Stucker, B. E., “Microstructures and Mechanical Properties of Ti-6Al-4V Parts Fabricated by Selective Laser Melting and Electron Beam Melting,” Journal of Materials Engineering and Performance, Vol. 22, No. 12, pp. 3872–3883, 2013.
Murr, L., Quinones, S., Gaytan, S., Lopez, M., Rodela, A., et al., “Microstructure and Mechanical Behavior of Ti-6Al-4V Produced by Rapid-Layer Manufacturing, for Biomedical Applications,” Journal of the Mechanical Behavior of Biomedical Materials, Vol. 2, No. 1, pp. 20–32, 2009.
Mertens, A., Reginster, S., Paydas, H., Contrepois, Q., Dormal, T., et al., “Mechanical Properties of Alloy Ti-6Al-4V and of Stainless Steel 316L Processed by Selective Laser Melting: Influence of Outof-Equilibrium Microstructures,” Powder Metallurgy, Vol. 57, No. 3, pp. 184–189, 2014.
Koike, M., Greer, P., Owen, K., Lilly, G., Murr, L. E., et al., “Evaluation of Titanium Alloys Fabricated using Rapid Prototyping Technologies–Electron Beam Melting and Laser Beam Melting,” Materials, Vol. 4, No. 10, pp. 1776–1792, 2011.
Vilaro, T., Colin, C., and Bartout, J. D., “As-Fabricated and Heat-Treated Microstructures of the Ti-6Al-4V Alloy Processed by Selective Laser Melting,” Metallurgical and Materials Transactions, Vol. 42, No. 10, pp. 3190–3199, 2011.
Tiley, J. S., “Modeling of Microstructure Property Relationships in Ti-6Al-4V,” Ph.D. Thesis, Ohio State University, 2002.
Kobryn, P. A. and Semiatin, S. L., “Mechanical Properties of Laser-Deposited Ti-6Al-4V,” Proc. of the Solid Freeform Fabrication, 2001.
AMS 2801B, “Heat Treatment of Titanium Alloy Parts,” Aerospace Materials Specification, 2003.
ASTM F2924, “Standard Specification for Additive Manufacturing Titanium–6 Aluminum–4 Vanadium with Powder Bed Fusion,” ASTM International, 2014.
Kruth, J. P., Badrossamay, M., Yasa, E., Deskers, J., Thijs, L., et al., “Part and Material Properties in Selective Laser Melting of Metals,” Proc. of the International Symposium on Electromachining, 2010.
David, S. A. and Vitek, J. M., “Correlation between Solidification Parameters and Weld Microstructure,” International Materials Reviews, Vol. 34, No. 1, pp. 213–245, 1989.
Ducheyne, P., Kohn, D., and Smith, T. S., “Fatigue Properties of Cast and Heat Treated Ti-6Al-4V Alloy for Anatomic Hip Prostheses,” Biomaterials, Vol. 8, No. 3, pp. 223–227, 1987.
Vandenbroucke, B. and Kruth, J.-P., “Selective Laser Melting of Biocompatible Metals for Rapid Manufacturing of Medical Parts,” Rapid Prototyping Journal, Vol. 13, No. 4, pp. 196–203, 2007.
AMS 4911L, “Titanium Alloy, Sheet, Strip, and Plate Ti-6Al-4V Annealed,” Aerospace Materials Specification, 2007.
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Justin Mezzetta M.Sc. candidate in the Department of Mining and Materials Engineering at McGill University. His research interest is to develop a processing plan to optimize mechanical performance of titanium components formed through selective laser melting.
Joon-Phil Choi Postdoc researcher in the Department of Mining and Materials Engineering at McGill University. His research focuses on preparation and synthesis of metallic powder and development of net-shaping technology of metallic powder including metal injection molding and additive manufacturing.
Jason Milligan Postdoc researcher in the Department of Mining and Materials Engineering at McGill University. His research interest is additive manufacturing technology for aerospace components.
Jason Danovitch M.Sc. candidate in the Department of Mining and Materials Engineering at McGill University. His research interests are residual stress measurements, geometric deformation analysis, and thermal cycling of Ti6Al4V fabricated by selective laser melting (SLM).
Nejib Chekir Ph.D. student in the Department of Mining and Materials Engineering at McGill University. His research interest is laser beam welding technology for aerospace applications.
Alexandre Bois-Brochu R&D project manager in Centre de métallurgie du Québec. His research interests are additive manufacturing and mechanical metal forming processes, including direct metal deposition, ultrasonic welding, forging, extrusion, and rolling.
Yaoyao Fiona Zhao Assistant Professor in the Department of Mechanical Engineering at McGill University. Her research interests are in the general area of design and manufacturing, including the exploration of new design methods, the use of advanced technologies, and the integration of better computer software and metrology tools to improve production.
Mathieu Brochu Associate Professor in the Department of Mining and Materials Engineering at McGill University. His research interests are fundamental modeling and processing-related research, and industrially-driven programs aiming at increasing the utilization and service performance of real-scale components fabricated from powder materials.
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Mezzetta, J., Choi, JP., Milligan, J. et al. Microstructure-Properties Relationships of Ti-6Al-4V Parts Fabricated by Selective Laser Melting. Int. J. of Precis. Eng. and Manuf.-Green Tech. 5, 605–612 (2018). https://doi.org/10.1007/s40684-018-0062-1
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DOI: https://doi.org/10.1007/s40684-018-0062-1