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

Automatic Welding 2021 #02
Avtomaticheskaya Svarka (Automatic Welding), #2, 2021, pp. 10-16

Development of brazing alloy, brazing technologies and correction of castings 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 brazing technology of heat-resistant nickel alloys CM93-BI and CM96- BI, 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 fi rst (calculation) stage the required concentrations of alloying elements in the base of brazing alloy, non-compliance of γ- and γ’-phases structure parameters, critical temperatures, number of electronic 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 structural structure of the base metal and the weld are identical. After brazing and heat treatment, boride eutectics in the brazed joints were not detected. It was established that within the determined limits boron does not reduce the resistance of welded joints to high-temperature salt corrosion. The surface properties of the brazing alloy and its interaction with the alloys CM93-BI and CM96-BI 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 welded joints at a temperature of 900 ºC was equal to 314… 321 MPa on the basis of 100 h, which amounts to 0.89…0.91 of long-term strength of polycrystalline alloys. The technology of correction of blade defects by SBM-4 brazing alloy was developed. 12 Ref., 4 Fig.
Keywords: brazing alloy, heat-resistant nickel alloys, brazing technology, correction of casting defects, depressant elements, boron, gas turbines, blade

Received: 02.02.2021


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