Issues »  Volume 42, Issue 6

Distribution of Elements in Carbides of Multicomponent Superalloys

O. A. Glotka, S. V. Haiduk

Zaporizhzhia Polytechnic National University, 64 Zhukovsky Str., UA-69063 Zaporizhzhya, Ukraine

Received: 24.09.2019; final version - 19.12.2019. Download: PDF

The peculiarities of the alloying elements influence on the composition of various carbides in a multicomponent system of the Ni–13.5Cr–5Co–3.4Al–4.8Ti–7.3W–0.8Mo–0.015B–0.12C type are studied. A crystallization process is simulated on the base of the thermodynamic calculations using CALPHAD method. The results of calculations of the chemical composition of carbides are given in comparison with experimental data obtained by electron microscopy. Determined by thermodynamic processes in the system, a complex character of the influence of alloying elements on the dissolution (precipitation) temperatures of primary and secondary carbides is revealed. As found, with an increase in the total concentration of carbide-forming elements, a composition of the MC type carbides becomes complex. Thus, with increasing concentration of titanium in the complex MC carbide, a tendency to form corresponding monocarbide is observed; with the introduction of niobium (above a certain concentration), the niobium monocarbide tends to form. Since hafnium is the most powerful carbide-forming element, its content in the alloy can be rather small to precipitate corresponding carbide. Modelling of the thermodynamic crystallization processes shows a high reliability and a good consistency of the obtained results with experimental data, which allows us to recommend this approach to computational prediction of the composition of carbides of various types in the alloy’s structure depending on the chemical elements content.

Key words: casting superalloys, alloying system, carbide structure and composition, CALPHAD method.

URL: http://mfint.imp.kiev.ua/en/abstract/v42/i06/0869.html

DOI: https://doi.org/10.15407/mfint.42.06.0869

PACS: 61.50.Ks, 61.66.Dk, 64.60.Ej, 64.75.Op, 68.55.Ln, 68.55.Nq

Citation: O. A. Glotka and S. V. Haiduk, Distribution of Elements in Carbides of Multicomponent Superalloys, Metallofiz. Noveishie Tekhnol., 42, No. 6: 869—884 (2020) (in Russian)

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