Technological Properties of Nickel Brazing Filler Metal and Structure of Brazed Joints from the ZhS6U Alloy

S. V. Maksymova, P. V. Kovalchuk, V. V. Voronov

E. O. Paton Electric Welding Institute, NAS of Ukraine, 11 Kazymyr Malevych Str., UA-03150 Kyiv, Ukraine

Received: 21.12,2020. Download: PDF

The paper presents the technological characteristics of multicomponent nickel brazing alloys with a reduced amount of zirconium, which does not exceed 2% wt. Their temperature range of melting and wetting of heat-resistant nickel alloy ZhS6U are investigated. On the basis of the experimental data and using the methods of statistical analysis, a surface described a dependence of the spreading area of the experimental brazing alloys of the Ni–Cr–Co–W–Mo–Al–(Nb, Ti, Zr) system on the content of zirconium, titanium and niobium is constructed. In the process of analyzing the experimental data, the positive influence of niobium and titanium on the spreading of multicomponent brazing filler metal over substrates of the heat-resistant cast nickel alloy ZhS6U is established. As shown, in alloys with an increased amount of titanium the alloying with zirconium up to 1% wt. leads to a decrease in the spreading area by 15%. With a subsequent increase in the content of zirconium to 2%, the spreading area practically does not change. In alloys with a low titanium concentration, but with increased niobium content, alloying with zirconium in an amount of 2% wt. promotes a stable increase in the spreading area (up to 35%) and ensures the formation of a contact wetting angle within 10–11°. This is due to the presence in these brazing filler metal of a low-melting eutectic enriched with zirconium with a solidus temperature at level 1101–1103°C, which is confirmed by the results of high-temperature differential thermal analysis and micro-X-ray spectral studies.

Key words: brazing, casting heat-resistant nickel alloy ZhS6U, brazing filler metal, wetting, spreading, microstructure.



PACS: 06.60.Vz, 61.66.Dk, 62.20.M-, 68.08.Bc, 81.20.Vj, 81.30.Fb

Citation: S. V. Maksymova, P. V. Kovalchuk, and V. V. Voronov, Technological Properties of Nickel Brazing Filler Metal and Structure of Brazed Joints from the ZhS6U Alloy, Metallofiz. Noveishie Tekhnol., 43, No. 8: 1079—1088 (2021) (in Ukrainian)

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