Ti-rich carboborides in the multi-component high-boron alloy: morphology and elemental distribution

Yu.G. Chabak; М.А. Golinskyi; V.G. Efremenko; H. Halfa; V.І. Zurnadzhy; B.V. Efremenko; E.V. Tsvetkova; A.V. Dzherenova

doi:10.15330/pcss.24.4.707-713

Authors

Yu.G. Chabak Pryazovskyi State Technical University, Dnipro, Ukraine; Institute of Materials Research of Slovak Academy of Sciences, Kosice, Slovakia
М.А. Golinskyi Pryazovskyi State Technical University, Dnipro, Ukraine
V.G. Efremenko Pryazovskyi State Technical University, Dnipro, Ukraine; Institute of Materials Research of Slovak Academy of Sciences, Kosice, Slovakia
H. Halfa Central Metallurgical Research and Development Institute, Eltebbin, Helwan, Cairo, Egypt
V.І. Zurnadzhy Pryazovskyi State Technical University, Dnipro, Ukraine; Institute of Materials Research of Slovak Academy of Sciences, Kosice, Slovakia
B.V. Efremenko Pryazovskyi State Technical University, Dnipro, Ukraine
E.V. Tsvetkova Pryazovskyi State Technical University, Dnipro, Ukraine
A.V. Dzherenova Pryazovskyi State Technical University, Dnipro, Ukraine

DOI:

https://doi.org/10.15330/pcss.24.4.707-713

Keywords:

multi-component cast iron, microstructure, EDS, Ti-rich carboboride, duplex inclusion

Abstract

In the article, the characterization of the morphology, chemical composition, and elemental distribution in the Ti-based carboboride M(C,B) in (wt.%) Fe-0.72C-2.75B-5.05W-5.57Mo-10.35Cr-2.60Ti multi-component alloy is fulfilled. The study was performed using optical microscopy, SEM, TEM, and energy-dispersive X-ray spectroscopy. It was found that the carboboride M(C,B) is present in the structure in the form of the equiaxed polygonal particles of a 0.5-7.3 mm mean size. The particles are divided into “duplex” and “uniform” ones. The duplex particles consists of the Ti-rich (75 wt. % Ti) “core” (Ti(C,B)) and the Ti-depleted (47.3 wt. % Ti) “shell” ((Ti,W,Mo,V)(C,B)). The uniform particles are characterized by an even distribution of the elements having a chemical composition close to the “shell”. The ratio of B:C (at. %) is 1:2.5, 1:3.3, and 1:3.2 for the “core”, “shell” and the uniform particle respectively. The chemical formulas of the duplex/uniform M(C,B) inclusions and the mechanism of their formation are proposed.

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