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http://dx.doi.org/10.4150/KPMI.2018.25.4.340

Effect of post heat treatment on fatigue properties of EBM 3D-printed Ti-6Al-4V alloy  

Choi, Young-Sin (Sunchon National University)
Jang, Ji-Hoon (Sunchon National University)
Kim, Gun-Hee (Gangwon Regional Division, Korea Institute of Industrial Technology (KITECH))
Lee, Chang-Woo (Gangwon Regional Division, Korea Institute of Industrial Technology (KITECH))
Kim, Hwi-Jun (Incheon Regional Division, Korea Institute of Industrial technology (KITECH))
Lee, Dong-Geun (Sunchon National University)
Publication Information
Journal of Powder Materials / v.25, no.4, 2018 , pp. 340-345 More about this Journal
Abstract
Additive manufacturing by electron beam melting is an affordable process for fabricating near net shaped parts of titanium and its alloys. 3D additive-manufactured parts have various kinds of voids, lack of fusion, etc., and they may affect crack initiation and propagation. Post process is necessary to eliminate or minimize these defects. Hot isostatic pressing (HIP) is the main method, which is expensive. The objective of this paper is to achieve an optimum and simple post heat treatment process without the HIP process. Various post heat treatments are conducted for the 3D-printed Ti-6Al-4V specimen below and above the beta transus temperature ($996^{\circ}C$). The as-fabricated EBM Ti-6Al-4V alloy has an ${\alpha}^{\prime}$-martensite structure and transforms into the ${\alpha}+{\beta}$ duplex phase during the post heat treatment. The fatigue strength of the as-fabricated specimen is 400 MPa. The post heat treatment at $1000^{\circ}C/30min/AC$ increases the fatigue strength to 420 MPa. By post heat treatment, the interior pore size and the pore volume fraction are reduced and this can increase the fatigue limit.
Keywords
Additive manufacturing; electron beam melting; Ti-6Al-4V; heat treatment; fatigue properties;
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1 D. Gibson, R. Plume, E. Bergin, S. Ragan and N. Evans: Astrophys J., 705 (2009) 123.   DOI
2 V. Chastand, P. Quaegebeur, W. Maia and E. Charkaluk: Mater. Charact., (2018) Available online 27 March (in press).
3 N. Hrabe, T. G. Herold and T. Quinn: Int. J. Fatigue, 94 (2017) 202.   DOI
4 G.S. Shin, Y-T. Hyun, N-K. Park, Y-H. Park and D-G. Lee: J. Korean Powder Metall. Inst., 24 (2017) 235.   DOI
5 T. Vilaro, C. Colin and J. D. Bartout: Metall. Mater. Trans. A, 42 (2011) 3190.   DOI
6 T.H. Becker, M. Beck and C. Scheffer: South Africal Journal of Industrial Engineering 26 (2015) 1.
7 E. Wycisk, C. Emmelmann, S. Siddique and F. Walther: Adv. Mater. Res., 816-817 (2013) 134.   DOI
8 S. Hongbo, C. Zheyuan, L. Jianrong, G. Shuili and X. Jianzhong: Rare Met. Mater. Eng., 43 (2014) 780.   DOI
9 A. Kirchner, B. Kloden, T. WeiBgarber, B. Kieback, A. Schoberth, S. Bagehorn and D. Greitemeier: Euro PM2015 Proceedings: AM - Electron Beam Melting, (2015).
10 H. Beladi, Q. Chao and G.S. Rohrer: Acta Mater., 80 (2014) 478.   DOI
11 H.K. Rafi, N.V. Karthik, Haijun Gong, Thomas L. Starr and Brent E. Stucker: J. Mater. Eng. Perform., 22 (2013) 3872.   DOI
12 T. Ahmed and H.J. Rack: Mater. Sci. Eng., A 243 (1998) 206.   DOI
13 S.L. Lu, M. Qian, H.P. Tang, M. Yan, J. Wang and D.H. Stjohn: Acta Mater., 104 (2016) 303.   DOI
14 S.T. Williams, P.J. Withers, I. Todd and P.B. Prangnell: Scripta Mater., 122 (2016) 72.   DOI
15 Bin Zhang, K.M. Han, S. Shao, N. Shamsaei and S.M. Thompson: Solid Freeform Fabrication 2017: Proceedings of the 28th Annual International Solid Freeform Fabrication Symposium. (2017) 107.