Designing brazing filler metal for heat-resistant alloys based on NI3AL intermetallide

Authors

DOI:

https://doi.org/10.15587/1729-4061.2020.217819

Keywords:

brazed joints, microstructure of joints, chemical composition, short-term and long-lasting strength, brazing technology, tantalum, rhenium, boron

Abstract

One of the most promising structural materials in gas turbine engineering is the alloys based on an intermetallide, the type of Ni3Al, with an equiaxial and directional columnar structure. These materials make it possible to increase the working temperature of blades to 1,220 °C. The blades are made by the method of precise casting in a vacuum; in this case, it is necessary to technologically join the nozzle blades into blocks, to fix the signal holes in cooled blades, to correct casting defects.

Welding by melting intermetallide materials, as well as other cast heat-resistant nickel alloys (HNA), does not yield positive results. Therefore, various brazing techniques are used such as TLP-Bonding (Transient Liquid Phase Bonding). Filler metals' melting point is lower than that of the main metal. The key issue related to the technology of brazing HNA, including the design of appropriate filler metals, is the improvement of the physical-mechanical and operational properties of brazed joints.

This paper reports the established rational doping of a filler metal base, as well as depressants, the critical temperatures and surface properties of filler metals, their chemical composition, the structure and properties of brazed joints, the mode parameters, and brazing technology. To improve the stability of the structure and the high-temperature strength of the brazed joints, the filler metal was alloyed with rhenium and tantalum. Mechanical tests of brazed joints at 900 °C were conducted in Ukraine; at a temperature of 1,100 °C ‒ in the People's Republic of China. The test results showed that the short-term strength of alloy compounds with an equiaxial structure based on the Ni3Al-type intermetallide at 1,100 °C is 0.98 of the strength of the main metal. The long-lasting strength at the same temperature meets the requirements for the strength of the main metal

 

Author Biographies

Viktor Kvasnytskyi, National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute» Peremohy ave., 37, Kyiv, Ukraine, 03056

Doctor of Technical Sciences, Professor

Department of Welding Production

Volodymyr Korzhyk, Guangdong Welding Institute (E.O. Paton Chinese-Ukrainian Institute of Welding) Changxing Road, 363, Tianhe, Guangzhou, China, 510650

Doctor of Technical Sciences, Senior Researcher, Director

Viacheslav Kvasnytskyi, Admiral Makarov National University of Shipbuilding Heroiv Ukrainy ave., 9, Mykolaiv, Ukraine, 54025

Doctor of Technical Sciences, Professor

Department of Welding Production

Heorhii Mialnitsa, Gas Turbine Research And Production Complex Zorya-Mashproekt Bohoiavlenskyiave., 42a, Mykolaiv, Ukraine, 54018

PhD, Associate Professor, Deputy Head of Metallurgy Department

Chunlin Dong, Guangdong Welding Institute (E.O. Paton Chinese-Ukrainian Institute of Welding) Changxing Road, 363, Tianhe, Guangzhou, China, 510650

Doctor of Engineering, Professor, General Director

Tetiana Pryadko, G. V. Kurdyumov Institute for Metal Physics of the National Academy of Sciences of Ukraine Akademika Vernadskoho blvd., 36, Kyiv, Ukraine, 03142

PhD, Head of the Laboratory

Laboratory of Eutectic Alloys

Maksym Matviienko, Kherson Branch Admiral Makarov National University of Shipbuilding Ushakova ave., 44, Kherson, Ukraine, 73003

PhD, Associate Professor

Department of Welding

Yevhen Buturlia, Admiral Makarov National University of Shipbuilding Heroiv Ukrainy ave., 9, Mykolaiv, Ukraine, 54025

Postgraduate Student

Department of Welding Production

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Published

2020-12-31

How to Cite

Kvasnytskyi, V., Korzhyk, V., Kvasnytskyi, V., Mialnitsa, H., Dong, C., Pryadko, T., Matviienko, M., & Buturlia, Y. (2020). Designing brazing filler metal for heat-resistant alloys based on NI3AL intermetallide. Eastern-European Journal of Enterprise Technologies, 6(12 (108), 6–19. https://doi.org/10.15587/1729-4061.2020.217819

Issue

Vol. 6 No. 12 (108) (2020): Materials Science

Section

Materials Science

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Copyright (c) 2020 Viktor Kvasnytskyi, Volodymyr Korzhyk, Viacheslav Kvasnytskyi, Heorhii Mialnitsa, Chunlin Dong, Tetiana Pryadko, Maksym Matviienko, Yevhen Buturlia

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