Impact of heat treatment cycles on work hardening characteristics in selective laser melted Ti6Al4V ELI alloy

Impact of heat treatment cycles on work hardening characteristics in selective laser melted Ti6Al4V ELI alloy

SUKRE Mahendra, MEENA Anil

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Abstract. The present study investigates the influence of heat treatment cycles on the work hardening behaviour of a selective laser-melted (SLM) Ti6Al4V ELI alloy. To modify the microstructure and assess its impact on work hardening behaviour, the SLM Ti6Al4V ELI alloy is subjected to a series of heat treatment cycles, including solution treatment, quenching, and ageing. The microstructural evolution is characterized using scanning electron microscopy (SEM) and X-ray diffraction (XRD). Tensile tests are conducted to investigate the work hardening behaviour, including yield strength, ultimate tensile strength, and strain hardening. The findings show that heat treatment cycles have a significant impact on the microstructure and work hardening behavior of the SLM Ti6Al4V ELI alloy. Solution treatment and quenching produce a refined α’ martensitic structure by homogenizing the microstructure and dissolving the secondary phases. Subsequent ageing treatments induce the precipitation of secondary phases, such as α and β phases, within the α’ martensite matrix.

Selective Laser Melting (SLM), Heat Treatment, Ti6Al4V (ELI), Work Hardening Behaviour

Published online 4/24/2024, 6 pages
Copyright © 2024 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA

Citation: SUKRE Mahendra, MEENA Anil, Impact of heat treatment cycles on work hardening characteristics in selective laser melted Ti6Al4V ELI alloy, Materials Research Proceedings, Vol. 41, pp 210-215, 2024


The article was published as article 23 of the book Material Forming

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[1] Y. Okazaki and A. Ishino, Microstructures and Mechanical Properties of Laser-Sintered Commercially Pure Ti and Ti-6Al-4V Alloy for Dental Applications, Materials 13 (2020) 1-18.
[2] J. Lu, H. Lu, X. Xu, J. Yao, J. Cai, and K. Luo, Int J Mach Tools Manuf 148 (2020) 103475.
[3] B. Dutta, F.H. Froes: Additive Manufacturing of Titanium Alloys : State of the Art, Challenges and Opportunities, vol. 1, 1st edn., Elsevier, Oxford, 2016.
[4] F. Froes, M.N. Gungor, M. Ashraf Imam, Cost-affordable titanium: the component fabrication perspective, JOM 59 (2007) 28-31.
[5] J. Zhang, B. Song, Q. Wei, D. Bourell, Y. Shi, A review of selective laser melting of aluminum alloys: Processing, microstructure, property and developing trends, Journal of Materials Science & Technology 35.2 (2019) 270-284.
[6] S. Cao, Z. Chen, C.V.S. Lim, K. Yang, Q. Jia, T. Jarvis, D. Tomus, X. Wu, Defect, microstructure, and mechanical property of Ti-6Al-4V alloy fabricated by high-power selective laser melting, JOM 69.12 (2017) 2684-2692.
[7] Ó. Teixeira, F.J.G. Silva, E. Atzeni, Residual stresses and heat treatments of Inconel 718 parts manufactured via metal laser beam powder bed fusion: an overview, The International Journal of Advanced Manufacturing Technology 113.11-12 (2021) 3139-3162.
[8] D. Chen, P. Wang, R. Pan, C. Zha, J. Fan, D. Liang, Y. Zhao, Characteristics of metal specimens formed by selective laser melting: a state-of-the-art review, Journal of Materials Engineering and Performance 30 (2021) 7073-7100.
[9] N.T. Aboulkhair, M. Simonelli, L. Parry, I. Ashcroft, C. Tuck, R. Hague, 3D printing of Aluminium alloys: Additive Manufacturing of Aluminium alloys using selective laser melting, Progress in materials science 106 (2019) 100578.
[10] B. Vrancken, L. Thijs, J.P. Kruth, J. Van Humbeeck, Heat treatment of Ti6Al4V produced by Selective Laser Melting: Microstructure and mechanical properties, Journal of Alloys and Compounds 541 (2012) 177-185.
[11] C. de Formanoir, A. Brulard, S. Vivès, G. Martin, F. Prima, S. Michotte, E. Rivière, A. Dolimont, and S. Godet, A strategy to improve the work-hardening behavior of Ti–6Al–4V parts produced by additive manufacturing, Materials Research Letters 5.3 (2017) 201-208.
[12] A. Mahmud, T. Huynh, L. Zhou, H. Hyer, A. Mehta, D.D. Imholte, N.E. Woolstenhulme, D.M. Wachs, and Y. Sohn, Mechanical behavior assessment of Ti-6Al-4V ELI alloy produced by laser powder bed fusion, Metals 11.11 (2021) 1671.
[13] H. Yu, F. Li, Z. Wang, and X. Zeng, Fatigue performances of selective laser melted Ti-6Al-4V alloy: Influence of surface finishing, hot isostatic pressing and heat treatments, International Journal of Fatigue 120 (2019) 175-183.
[14] Rodney. Boyer, Gerhard. Welsch, and E.W. Collings: Materials Properties Handbook : Titanium Alloys, ASM International, 1994.