This work examines the construction of the phase diagram of the Cr-Fe-Al-Si metallic system using thermodynamic-diagram analysis (TDA) methods. Based on thermodynamic calculations performed with the FactSage and HSC Chemistry software packages, standard Gibbs energy (ΔG1723), enthalpy (ΔH1723), and entropy (ΔS1723) values for all compounds of the system were determined. Triangulation of the four ternary subsystems Cr-Fe-Al, Cr-Fe-Si, Cr-Al-Si, and Fe-Al-Si was carried out, considering congruently and incongruently melting compounds, which made it possible to identify the phase stability regions. As a result of tetrahedration, it was established that the system consists of 24 elementary tetrahedrons, and the total relative volume equals 0.9978, which confirms the correctness of the calculations. For the alloy containing Al-15%, Si-40%, Cr-25%, and Fe-20%, phase composition modeling and approximate melting temperature calculation using the rule of mixtures were performed, resulting in a value of about 1450 °C. The constructed phase diagram and the obtained transformation equations make it possible to predict the evolution of phases as the alloy composition changes, select the optimal charge mixture for aluminumsilicochromium smelting, and improve the technological efficiency of reduction processes. The obtained results can be applied in the development of new chromium-based alloys and the optimization of metallurgical processes to reduce costs and improve the quality of the final product.

SHABANOV E.ZН.

PhD, associate professor, professor of the department of metallurgy and mining, Aktobe Regional University named after K. Zhubanov, Aktobe, Kazakhstan.

Е-mail: yshabanov@zhubanov.edu.kz, https://orcid.org/0000-0001-6902-1211

KHISMATULIN D.O.

Master's student, Aktobe Regional University named after K. Zhubanov, Aktobe, Kazakhstan.

E-mail: daniil.h@bk.ru, https://orcid.org/0009-0007-9698-3476

ZHUMAGALIEV E.U.

Candidate of technical sciences, associate professor, professor department of metallurgy and mining, Aktobe Regional University named after K. Zhubanov, Aktobe, Kazakhstan.

E-mail: yzhumagaliyev@zhubanov.edu.kz, https://orcid.org/0000-0003-2227-0661

DZHUNDIBAEVA A.S.

1st year PhD doctoral student, Toraighyrov University, Pavlodar, Kazakhstan.

E-mail: ajundibaeva@zhubanov.edu.kz, https://orcid.org/0009-0006-5244-3497

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Cr-Fe-Al-Si system, phase diagram, thermodynamic-diagram analysis, Gibbs energy, tetrahedration, aluminumsilicochromium, thermodynamic modeling