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METAL PROCESSING
ArticleName Selective laser melting of heat-resistant Ni-based alloy
DOI 10.17580/nfm.2015.01.08
ArticleAuthor Sufiiarov V. Sh., Popovich A. A., Borisov E. V., Polozov I. A.
ArticleAuthorData

Peter the Great Saint Petersburg Polytechnic University, Saint Petersburg, Russia:

V. Sh. Sufiiarov, Leading Researcher, e-mail: vadim.spbstu@yandex.ru
A. A. Popovich, Director of Institute of Metallurgy, Mechanical Engineering and Transport
E. V. Borisov, Post-Graduate, Researcher
I. A. Polozov, Student, Engineer

Abstract

The paper describes the integrated research of selective laser melting of heat-resistant nickel alloy Inconel 718. The research findings describe morphology, particle size distribution, evolution of structure and phase composition of the nickel alloy produced by gas atomization. Based on the study results, the powder particles possess good flowability, has more than 90% content of -Ni phase, and the shape of the particles is close to spherical, though some particles have satellites. The authors analyzed the influence exerted by the parameters of selective laser melting on the alloy specimen porosity. The variable parameters were assumed to be laser power, scanning speed and hatch distance. It follows from the research outcome that the best results (relative density 99.7%) are achieved with the laser power of 245 W, scanning speed of 755 mm/s and hatch distance of 90 μm. The mechanical properties of Inconel 718 alloy specimens shows that the strength and plasticity properties of Inconel 718 are comparable with these properties of the specimens manufactured by casting without thermal treatment. In particular, the ultimate tensile strength of the test specimens is 851–949 MPa, yield stregth is 569–609 MPa and the relative elongation is 9.8–31.7%. The further improvement of quality of SLM products needs heat treatment aimed at optimization of phase composition and structure as well as removal of thermal and residual stresses.

This work was carried out with financial State support by the Ministry of Education and Science according to the grant agreement № 14.626.21.0001 (unique identifier RFMEFI62614X0001) under the Federal Target Program “Research and development on priority directions of scientific-technological complex of Russia for 2014–2020”

keywords Selective laser melting, additive manufacturing, heat-resistant nickel alloy, powder metallurgy, additive layer manufacturing
References

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