Aerospace Technic and Technology

The new production method, called additive technologies, is a method with the ability to produce 3D products in layers. One of the most widely used methods for the additive production of metal products is selective laser melting. To melt the metal in the form of a powder, use a ytterbium fiber laser with a power of 200 to 1000 W, the radiation of which with the help of mirrors on a high-speed drive is focused to the required place. The subject of research was the possibility of creating products from the heat-resistant alloy INCONEL 718 by the method of layer-by-layer fusion on the equipment produced by LLC «Additive Laser Technology of Ukraine». The material for research was a test sample made by the SLM method (laser selective melting) by layer-by-layer fusion of the metal powder of the heat-resistant alloy INCONEL 718 with the laser beam. Research methods: microstructural analysis by light microscope Carl Zeiss AXIOVERT M200 MAT, particle size analysis by scanning electron microscope REM 106, the microstructure was detected by etching in CuSO4 + HCl. Objective: to establish the possibility of manufacturing a high-quality sample of alloy INCONEL 718, the study of its porosity and microstructure as the main indicators of print quality. Results: it was found that the equipment produced by LLC «Additive Laser Technology of Ukraine» allows to implement the SLM process and to manufacture products from INCONEL 718 alloy with high metal density. The study of the microstructure in the planes parallel and perpendicular to the direction of sample construction was performed. Conclusions: additive technologies are promising for the creation of parts and structures for aerospace technology, allowing to reduce the time and cost of their design and creation. The possibility of creating high-quality products from INCONEL 718 alloy using the SLM method at the installation of the production of LLC «Additive Laser Technology of Ukraine» (Dnipro) is shown. The interrelation of process parameters and microstructure is shown, which necessitates the development of reasonable SLM process modes for products for various purposes

additive technologies; laser selective melting; nickel alloy; porosity; microstructure

Kruth, J.-P., Leu, M.-C., and Nakagawa, T. Progress in additive manufacturing and rapid pro-totyping. CIRP Ann.-Manuf. Technol., 1998, vol. 47, no. 2, pp. 525–540. Doi: 10.1016/S0007-8506(07)63240-5.

Mahoney, M. W. Superplastic Properties of Alloy 718. Superalloy 718 Metallurgy and Applications. The Minerals, Metals & Materials Society, 1989, pp. 391-405.

DOI: 10.7449/1989/Superalloys_1989_391_405.

Huzel, D. K., Huang, D. H. Design of Liquid Propellant Rocket Engines. Huston, National Aerospace And Space Administration Publ., 1967. 461 p.

Jia, Q., Gu, D. Selective laser melting additive manufacturing of Inconel 718 superalloy parts: Densification, microstructure and properties. J. Alloys Compd., 2014, vol. 585, pp. 713–721. Doi: 10.1016/j.jallcom.2013.09.171.

Williams, C. B., Mistree, F., Rosen, D. W. Towards the design of a layerbased additive manufacturing process for the realization of metal parts of designed mesostructured. Proc. 16th Solid Free. Fabr. Symp., 2005, pp. 217–230.

Shifeng, W., Shuai, L., Qingsong, W., Yan, C., Sheng, Z., and Yusheng, S. Effect of molten pool boundaries on the mechanical properties of selective laser melting parts. J. Mater. Process. Technol., 2014, vol. 214, no. 11, pp. 2660–2667.

Loh, L.-E., Chua, C.-K., Yeong, W.-Y., Song, J., Mapar, M., Sing, S.-L., Liu, Z.-H., and Zhang, D.-Q. Numerical investigation and an effective modelling on the Selective Laser Melting (SLM) process with aluminium alloy 6061. Int. J. Heat Mass Transf., 2015, vol. 80, pp. 288–300.

Wakshum, M. Tucho, Cuvillier, Р., Sjolyst-Kverneland, А., Hansen, V. Microstructure and hardness studies of Inconel 718 manufactured by selective laser melting before and after solution heat treatment. Materials Science & Engineering: A, 2017, vol. 689, pp. 220–232. DOI: 10.1016/j.msea.2017.02.062.

Campanelli, S. L., Contuzzi, N., Angelastro, A. Capabilities and Performances of the Selective Laser Melting process. New trends in Technologies: Devices, Computer, Communication and Industrial Systems, 2010, pp. 233-252. DOI: 10.5772/10432.

Yuan, H., Liu, W. C. Effect of the δ phase on the hot deformation behavior of Inconel 718. Mater. Sci. Eng.: A, 2005, vol. 408, no. 1–2, pp. 281–289. DOI:10.1016/j.msea.2005.08.126.

ASM Metals HandBook V. 2. Properties and Selection: Nonferrous Alloys and Special-Purpose Materials. ASM International Publ., 2002. 1328 p.

Rozenberg, V.M. Osnovy zharoprochnosti metallicheskih materialov [Fundamentals of heat resistance of metallic materials]. Moscow, Metallurgiya Publ., 1973. 324 p.

Fridlyander, I. N., Senatorova, O. G., Osincev, O. E. Mashinostroenie: Ehnciklopediya. T. II-3: Cvetnye metally i splavy. Kompozicionnye metallicheskie materialy [Engineering: Encyclopedia T. II-3: Non-ferrous metals and alloys. Composite metal materials]. Moscow, Mashinostroenie Publ., 2001. 880 р.

Seede, R., Mostafa, A., Brailovski, V., Jahazi, M., and Medraj, M., Microstructural and Microhardness Evolution from Homogenization and Hot Isostatic Pressing on Selective Laser Melted Inconel 718: Structure, Texture, and Phases. J. Manuf. Mater. Process., 2018, no. 2, pp. 30-51. Doi 10.3390/jmmp2020030.

Reed, R. C. The Superalloys: Fundamentals and Applications. Cambridge, Cambridge University Press Publ., 2006. 390 p.

Thijs, L., Verhaeghe, F., Craeghs, T., Humbeeck, J. V., Kruth, J.-P. A study of the micro-structural evolution during selective laser melting of Ti–6Al–4V. Acta Mater., 2010, vol. 58, no. 9, pp. 3303–3312. Doi: 10.1016/j.actamat.2010.02.004.

Parimi, L. L., Ravi, G. A., Clark, D., and Attallah, M. M. Microstructural and texture development in direct laser fabricated IN718. Mater. Charact., 2014, vol. 89, pp. 102–111. Doi: 10.1016/j.matchar.2013.12.012.

Moussaoui, K., Rubio, W., Mousseigne, M., Sultan, T., Rezai F. Effects of Selective Laser Melting additive manufacturing parameters of Inconel 718 on porosity, microstructure and mechanical properties. Materials Science and Engineering: A, vol. 735, no. 26, 2018, pp. 182-190.

Bean, G. E., Witkin, D. B., McLouth, T. D., Patel, D. N., Zaldivar, R. J. Effect of laser focus shift on surface quality and density of Inconel 718 parts produced via selective laser melting. Additive Manufacturing, 2018, vol. 22, pp. 207-215.