2021 №02 (01) DOI of Article
2021 №02 (03)

The Paton Welding Journal 2021 #02
TPWJ, 2021, #2, 8-13 pages

Development of brazing alloy, brazing technologies and correction of casting surface defects of heat-resistant nickel alloys for ship gas turbines

V.V. Kvasnytskyi1, M.V. Matviienko2, H.P. Mialnitsa3, I.H. Kvasnytska4, Ye.A. Buturlia5
1National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute», 37 Peremohy Ave., 03056, Kyiv, Ukraine. E-mail: kvas69@ukr.net
2Kherson branch Admiral Makarov National University of Shipbuilding, 44 Ushakov Str., 73003 Kherson, Ukraine
3Gas Turbine Research and Production Complex Zorya-Mashproekt, 42-a Bogoyavlenskiy Ave., 54018, Mykolaiv, Ukraine
4Physical and Technological Institute of Metals and Alloys of the NAS of Ukraine, 34/1 Vernadskogo, 03142, Kyiv, Ukraine.
5Admiral Makarov National University of Shipbuilding, 9 Geroev Ukrainy Ave., 54000, Mykolaiv, Ukraine

The aim of the work was to develop brazing alloy and technology of brazing heat-resistant CM93-BI and CM96-BI nickel alloys, used in the production of new generation ship gas turbines. A prerequisite was to provide high-temperature strength of the brazed joints not lower than 80 % of the strength of the base metal. During the development of the brazing alloy, a two-stage procedure was used, where at the first (calculation) stage the required concentrations of alloying elements in the base of brazing alloy, noncompliance of γ- and γ`-phases structure parameters, critical temperatures, number of electron vacancies, physical and mechanical properties of alloys were determined. At the second (experimental) stage, the rational content of the number of depressant elements was determined. As a depressant, boron was chosen. It was established that when using a brazing alloy containing 1.0‒1.2 wt.% of boron, the structure of the base metal and the weld are identical. After brazing and heat treatment, boride eutectics in the brazed joints were not revealed. It was established that within the determined limits boron does not reduce the resistance of brazed joints to high-temperature salt corrosion. The surface properties of the brazing alloy and its interaction with CM93-BI and CM96-BI alloys were studied. The developed SBM-4 brazing alloy showed high technological properties and allows raising the temperature of working gas in gas turbines. The developed technology of brazing CM93-BI and CM96-BI alloys provided the tensile strength σt at the level of the base metal. The long-term strength of the brazed joints at a temperature of 900 °C was equal to 314‒321 MPa on the basis of 100 h, which amounts to 0.89‒0.91 of a long-term strength of polycrystalline alloys. The technology of correction of blade defects by SBM-4 brazing alloy was developed. 12 Ref., 4 Figures.
Keywords: brazing alloy, heat-resistant nickel alloys, brazing technology, correction of casting defects, depressant elements, boron, gas turbines, blade

Received 26.10.2021


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