Issue 35

R. Konečná et alii, Frattura ed Integrità Strutturale, 35 (2016) 31-40; DOI: 10.3221/IGF-ESIS.36.04 40 A CKNOWLEDGEMENTS he authors wish to acknowledge the company Protoservice srl., Fornovo Taro, Italy for providing the Inconel 718 specimens produced by SLM and the research was supported by project VEGA grant No. 1/0685/2015. R EFERENCES [1] Kruth, J. P., Levy, G., Klocke, F., Childs, T. H. C., Consolidation phenomena in laser and powder-bed based layered manufacturing, CIRP Ann. Manuf. Technol., 56 (2007) 730-759. [2] Yadroitsev, I., Thivillon, L., Bertrand, P., Smurov, I., Strategy of manufacturing components with designed internal structure by selective laser melting of metallic powder, Appl. Surf. Sci, 254 (2007) 980-983. [3] Zhang, H. Y., Zhang, S. H., Cheng, M., Li, Z. X., Deformation characteristics of δ phase in the delta-processed Inconel 718 alloy, Materials Characterization, 61 (2010) 49-53. [4] Kirman, I., Warrington, O. H., Precipitation in nickel-based alloys containing both niobium and titanium, J. Inst. Metals, 99 (1971) 197-202. [5] Cozar, R., Pineau, A., Morphology of  ’ and  ’’ precipitates an thermal stability of Inconel 718 type alloys, Metall. Trans, 4 (1973) 47-59. [6] Sundararaman, M., Mukhopadhyay, P., Banerjee, S., Some aspects of the precipitation of metastable intermetallic phases in Inconel 718, Metall. Trans, 23A (1992) 2015-2028. [7] Durand-Charre, M., Davidson, J. H., The Microstructure of superalloys, Gordon and Breach Science Publ., Amsterdam, (1997) 124. [8] Gu, D., Shen, Y., Balling phenomena in direct laser sintering of stainless steel powder: Metallurgical mechanisms and control methods, Materials and Design, 30 (2009) 2903-2910. [9] Janaki Ram G. D., Venugopal Reddy, A., Prasad Rao, K., Reddy, G. M., Sarin Sundar, J. K., Journal of Materials Processing Technology, 167 (2005) 73-82. [10] Murr, L. E., et al., Microstructural architecture, microstructures, and mechanical properties for a nickel base superalloy fabricated by electron beam melting, Metall. Trans A, 42A (2011) 3491-3508. [11] Kruth, J. P., Badrossamay, M., Yasa, E., Deckers, J., Thijs, L., Van Humbeeck, J., Part and material properties in selective laser melting of metals. 16th International Symposium on Electromachining (ISEM), Shanghai, China, (2010). [12] Amato K. N., et al., Microstructures and mechanical behavior of Inconel 718 fabricated by selective laser melting, Acta Mater., 60 (2012) 2229-2239. [13] Jia, Q., Gu, D., Selective laser melting additive manufacturing of Inconel 718 superalloy parts: Densification, microstructure and properties, J.Alloys Comp, 585 (2014) 713-721. [14] Wang, Z., Guan, K., Gao, M., Li, X., Chen, X., Zeng , X., The microstructure and mechanical properties of deposited- IN718 by selective laser melting, J.Alloys Comp, 513 (2012) 518- 523. [15] Clavel, M., Pineau, A., Frequency and wave-form effects on the fatigue crack growth behavior of alloy 718 at 298 and 823 K, Metall. Trans A, 9A (1978) 471-480. [16] Clavel, M., Pineau, A., Fatigue behavior of two nickel-base alloys. I. Experimental results on low cycle fatigue, fatigue crack propagation and substructures. Mat. Sci. Eng A, 55 (1982) 157-171. [17] Yuen, L. J., Roy, P., Nix, W. D., Effect of oxidation kinetics on the near threshold fatigue crack growth behavior of a nickel base superalloy, Metall. Trans A, 15A (1984) 1769-1775. [18] Yamada, Y., Newman Jr., J. C., Crack closure under high load-ratio conditions for Inconel-718 near threshold behavior, Eng. Fract. Mech., 76 (2009) 209-220. [19] Xiao, L., et al., Effect of boron on fatigue crack growth behavior in superalloy IN 718 at RT and 650 °C, Mat. Sci. Eng. A, 428 (2006) 1-11. [20] Andersson, H., Persson, C., In-situ SEM study of fatigue crack growth behaviour in IN718, Int. J. Fatigue, 26 (2004) 211-219. T