Issues »  Volume 46, Issue 5

The Structure and Properties of G-CuZn15Si4 Cast Brass After Inoculation of Its Melt with Dispersed FeCr Intermetallic Component

I. A. Nebozhak$^{1}$, V. G. Novytskyi$^{1}$, Ie. M. Dzevin$^{2}$, A. M. Verkhovliuk$^{1}$

$^{1}$Physico-Technological Institute of Metals and Alloys, NAS of Ukraine, 34/1 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine
$^{2}$G. V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, 36 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine

Received: 25.01.2024; final version - 28.03.2024. Download: PDF

With using of a dispersed-filled gasifying model, it is possible to inoculate the cast brass of the G-CuZn15Si4 (DIN) alloy with intermetallic FeCr, known in the alloys of the binary Fe–Cr system as the $\sigma$ phase, and to obtain the test castings. With the use of x-ray spectral microanalysis, the chemical composition of cast samples is determined before and after the process of inoculation of the matrix melt with dispersed intermetallic FeCr. The results of x-ray spectral microanalysis show that the cast composite includes Fe and Cr within 1% that vary along the height of the cast sample, while the chemical composition of the control casting contains half as much Fe and Cr is not detected at all. The metallographic analysis of G-CuZn15Si4 cast brass after inoculation make it possible to detect the inclusions of the $\sigma$-phase in the field of the metallographic section that is a sign of the microstructure of the zero-dimensional cast composite material of the Cu–FeCr system, while the microstructure of the control casting is characteristic of G-CuZn15Si4 cast brass. The results of mechanical tests of cast samples and their wear tests under dry-friction conditions allow us to come to the conclusion that the hardness of G-CuZn15Si4 cast brass, which is determined according to the Brinell scale, and its tribotechnical characteristics depend on the height of casts of both types, and on the same properties of cast of the sample after inoculation with dispersed intermetallide FeCr is affected by Fe and Cr concentrations. Graphical interpretation of the experimental data shows that the mechanical and tribotechnical properties of brass castings after the process of inoculation of the matrix melt by the $\sigma$ phase significantly exceed the similar characteristics of G-CuZn15Si4 cast brass before inoculation.

Key words: dispersed-filled gas model, dispersed inoculator, composite cast, lost-foam casting process, G-CuZn15Si4 cast brass, matrix melt, tribotechnical properties.

URL: https://mfint.imp.kiev.ua/en/abstract/v46/i05/0385.html

DOI: https://doi.org/10.15407/mfint.46.05.0385

PACS: 61.66.Dk, 62.20.Qp, 64.70.dj, 81.05.Bx

Citation: I. A. Nebozhak, V. G. Novytskyi, Ie. M. Dzevin, and A. M. Verkhovliuk, The Structure and Properties of G-CuZn15Si4 Cast Brass After Inoculation of Its Melt with Dispersed FeCr Intermetallic Component, Metallofiz. Noveishie Tekhnol., 46, No. 5: 385—413 (2024)

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