PSI - Issue 7

Z.H. Jiao et al. / Procedia Structural Integrity 7 (2017) 124–132 Z.H. Jiao et Al./ Structural Integrity Procedia 00 (2017) 000–000

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• The SLM produced Ti6Al4V alloy shows higher FCG resistance under the stress ratio of 0.1 than 0.5, however, the FCG resistance of both stress ratios become more and more close to each other with the crack propagating. The steady stage FCGR at RT is slower than 400 ℃ in the lower △ K region and faster in the higher △ K region. • The steady stage FCG resistance under stress ratio of 0.1 of SLM produced Ti6Al4V is comparable to conventionally manufactured Ti6Al4V alloys. It shows higher than bar alloy as well as basically consistent with forging and casting alloys in the middle △ K region, but lower than forging and casting alloys in the lower △ K region. Acknowledgements The supply of SLM produced alloys from Xian Bolite Laser Forming Technology Co, LTD is gratefully acknowledged. References [1] R.R. Boyer, 1996. An overview on the use of titanium in the aerospace industry. Materials Science & Engineering A 213 (1-2), 103-114. [2] Tersing, H., Lorentzon, J., Francois, A., Lundback, A., Babu, B., Barboza, J., Backer, V., Lindgren, L.E., 2012. Simulation of manufacturing chain of a titanium aerospace component with experimental validation. Finite Elements in Analysis & Design 51(2), 10-21. [3] D. Brackett, I. Ashcroft, R. Hague, 2011. Topology optimization for additive manufacturing, in: Proceedings of the 24th Solid Free form Fabrication Symposium (SFF'11), 6-8. [4] B.Vayre, F.Vignat, F.Villeneuve, 2012. Designing for additive manufacturing, Procedia Cirp 3, 632-637. [5] Van Hooreweder B, Moens D, Boonen R, Kruth J P, Sas P, 2012. Analysis offracture toughness and crack propagation of Ti6Al4V produced by selective laser melting. Advanced Engineering Materials 14(1-2), 92-97. [6] Galina Kasperovich, Joachim Hausmann, 2015. Improvement of fatigue resistance and ductility of TiAl6V4 processed by selective laser melting. Journal of Materials Processing Technology 220, 202-214. [7] P. Edwards, M. Ramulu, 2014. Fatigue performance evaluation of selective laser melted Ti-6Al-4V. Materials Science & Engineering A 598, 327-337. [8] B. Van Hooreweder, R. Boonen, D. Moens, J. P. Kruth, P. Sas, 2012. On the determination of fatigue properties of Ti6Al4V produced by selective laser melting, in: Proceedings of the 53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference, Honolulu, Hawaii, 1733. [9] Q. Liu, J. Elambasseril, S. Sun, M. Leary, M. Brandt, P. K. Sharp, 2014. The effect of manufacturing defects on the fatigue behavior of Ti 6Al-4V specimens fabricated using selective laser melting, Advanced Materials Research 891-892, 1519-1524. [10] V. Cain, L. Thijs, J. Van Humbeeck, B. Van Hooreweder, R. Knutsen, 2015. Crack propagation and fracture toughness of Ti6Al4V alloy produced byselective laser melting. Additive Manufacturing 5, 68-76. [11] S. Leuders, M. Thone, A. Riemer, T. Niendorf, T. Troster, H.A. Richard, H.J. Maier, 2013. On the mechanical behaviour of titanium alloy TiAl6V4 manufactured by selective laser melting: Fatigue resistance and crack growth performance. International Journal of Fatigue 48, 300 307. [12] Haize Galarraga, Robert J. Warren, Diana A. Lados, Ryan R. Dehoff, Michael M. Kirka, 2017. Fatigue crack growth mechanisms at the microstructure scale in as-fabricated and heat treated Ti-6Al-4V ELI manufactured by electron beam melting (EBM). Engineering Fracture Mechanics 176, 263-280.