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2021 №10 (03) DOI of Article
2021 №10 (05)

Automatic Welding 2021 #10
Avtomaticheskaya Svarka (Automatic Welding), #10, 2021, pp. 29-34

Mathematical modeling of melting temperature range and phase composition of multicomponent nickel alloys

S.V. Maskimova, V.V. Voronov, P.V. Kovalcuk
E.O. Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua

Modern brazing fi ller metals for brazing high-temperature nickel alloys are complex alloys, where the components should provide the required level of strength, high-temperature resistance, high-temperature corrosion resistance and other service properties of brazed joints. However, establishing the optimum composition to obtain the desired set of properties is a non-trivial task, requiring considerable investment of time and money. The work is a study of applicability of the method of mathematical modeling of thermodynamic processes (CALPHAD) during development of multicomponent brazing fi ller metals for brazing high-temperature nickel alloys. During performance of investigations, using CALPHAD computational procedure, melting temperature ranges were determined for a number of alloys of Ni–Cr–Co–Al–(Ме)–Ta system. Calculated data were obtained on the infl uence of adhesion-active elements of group IV and V of the periodic table on liquidus temperature and phase composition of the basic nickel alloy. In particular, their impact on the quantity and thermal stability of γ'-phase and σ-phase was determined. Thermodynamic calculated data, obtained with application of mathematical modeling method, were used during development and investigation of a number of promising brazing fi ller metals for brazing high-temperature nickel alloys, including singlecrystal high-temperature nickel alloy ZhS-32VI. 21 Ref., 8 Fig.
Keywords: brazing fi ller alloy, brazing, high-temperature nickel alloys, mathematical modeling (CALPHAD), adhesion-active components, titanium, niobium, tantalum, γ'-phase, σ-phase

Received: 7.07.2021


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