Metal Power Compositions for the EP648 Heat Resistant Alloy Manufactured by All-Russian Research Institute for Aircraft Materials VIAM for Selective Laser Melting, Laser Metal Deposition and Metal Injection Molding Technologies

In this article the authors review the application of the EP648 alloy powders manufactured by VIAM in selective laser melting (SLM), laser metal deposition (LMD) and metal injection molding (MIM) technologies. The features of the structure forming of SLS-synthesized material are investigated, and mechanical characteristics are tested including stress rupture life. The influence of the protection environment used in the synthesis process on mechanical characteristics is investigated. It is shown that after heat treatment and hot isostatic pressing the synthesized EP648 material surpasses cast analogue by 20–25 % in toughness and up to 2.5–3 times in plasticity. The application of the EP648 powder for repairing geometry of complex components for gas turbine engines including rotating blades of high pressure turbines by laser metal deposition is considered. This technology ensures the formation of flawless material, without cracks and incomplete fusion at the boundaries. The possibilities of future use of fine powder of the EP648 alloy in high-precision powder injection molding technologies for the production of high quality components of complex shapes are shown.

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