PSI - Issue 1

J.A.M. Ferreira et al. / Procedia Structural Integrity 1 (2016) 126–133 Ferreira JAM et al./ Structural Integrity Procedia 00 (2016) 000 – 000

133

8

4. Conclusions

Present work studied the static and fatigue response of single laser sintered specimens and two materials hybrid formulations. The main conclusions are: - Very high scan speed (400 or 600 mm/s) causes high porosity percentages and consequent drastic reduction of tensile strength and stiffness; - Tensile properties of single laser sintered parts and two materials hybrid parts were quite similar; - Fatigue strength of hybrid parts is quite similar to that of single sintered specimens for short lives, but tends to became significant lower for long lives, reaching about 30% for N = 5x105 cycles.

Acknowledgements

This research is sponsored by FEDER funds through the program COMPETE (under project T449508144 00019113) and by national funds through FCT – Fundação para a Ciência e a Tecnologia – , under the project PTDC/EMS-PRO/1356/2014. The authors would like to acknowledge also EROFIO, Batalha, Portugal for the supply of materials and samples used in this project.

References

Brandl, E., Heckenberger, U., Holzinger, V., Buchbinder, D., 2012. Additive manufactured AlSi10Mg samples using selective laser melting (SLM): microstructure, high cycle fatigue, and fracture behaviour. Mater Design 34, 159 – 69. Gorny, B., Niendorf, T., Lackmann, J., Thöne, M., Tröster, T., Maier, H.J., 2011. In situ characterization of the deformation and failure behaviour of non-stochastic porous structures processed by selective laser melting. Mater Sci Eng A528 (27), 962-967. Khaing, M.W., Fuh, J.Y.H., Lu, L., 2001. Direct metal laser sintering for rapid tooling: processing and characterization of EOS parts. Journal of Materials Processing Technology 113, 269 – 272. Leuders, S., Thöne, M., Riemer, A., Niendorf, T., Tröster, T., Richard, H.A., Maier, H.J., 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. Murr, L.E., Gaytan, S.M., Ceylan, A., Martinez, E., Martinez, J.L., Hernandez, D.H., et al., 2010. Characterization of titanium aluminide alloy components fabricated by additive manufacturing using electron beam melting. Acta Mater 58(5), 1887 – 1894. Persson, A., Hogmark, S., Bergström, J., 2004. Simulation and evaluation of thermal fatigue cracking of hot work tool steels. International Journal of Fatigue 26, 1095 – 1107. Santos, E.C., Osakada, K., Shiomi, M., Kitamura, Y., Abe, F., 2004. Microstructure and mechanical properties of pure titanium models fabricated by selective laser melting. Proc Inst Mech Eng C, J Mech Eng Sci, 218(7), 711 – 719. Shiomi, M., Osakada, K., Nakamura, K., Yamashita, T., Abe, F., 2004. Residual stress within metallic model made by selective laser melting process. CIRP Ann – Manuf Tech 53(1), 195 – 198. Simchi, A., 2006, Direct laser sintering of metal powders: Mechanism, kinetics and microstructural features. Materials Science and Engineering A 428 (1 – 2), 148 – 158. Vilaro, T., Colin, C., Bartout, J.D., 2011. As-fabricated and heat-treated microstructures of the Ti – 6Al – 4V alloy processed by selective laser melting. Metall Mater Trans A 42A(10), 3190 – 3199. Wang, Y., Bergstrom, J., Burman, C., 2006. Four-point bending fatigue behaviour of an iron-based laser sintered material. International Journal of Fatigue 28, 1705 – 1715. Wang, Y., Bergstrom, J., Burman, C., 2009. Thermal fatigue behavior of an iron-based laser sintered material. Materials Science and Engineering A 513 – 514, 64 – 71.