Structural State and Thermodynamic Stability of Fe-B-C Alloys

N.Yu. Filonenko; A. N. Galdina; А.I. Babachenko; G.A. Kononenko

doi:10.15330/pcss.20.4.437-444

Authors

N.Yu. Filonenko State Institution “Dnipropetrovsk Medical Academy of Health Ministry of Ukraine”
A. N. Galdina Oles Honchar Dnipro National University
А.I. Babachenko Z.I. Nekrasov Iron and Steel Institute of National Academy of Sciences of Ukraine
G.A. Kononenko Z.I. Nekrasov Iron and Steel Institute of National Academy of Sciences of Ukraine

DOI:

https://doi.org/10.15330/pcss.20.4.437-444

Keywords:

Fe-B-C system alloys, Fe2B boride, Fe3(CB) boron cementite, eutectics, thermodynamic stability of the melt

Abstract

The studies were performed for the specimens of Fe-B-C alloys with boron content of 0.005–7.0 wt.% and carbon content of 0.4–5.5 wt.%, the rest was iron. As a result of the experiment carried out in this work, the phase composition and phase transformations occurring in the alloys are investigated and the liquidus surface is constructed; it is shown that the point with minimum temperature of 1375 K at the liquidus surface is observed at boron content of 2.9 wt.% and carbon content of 1.3 wt. %.

For the first time, considering the contribution of the first degree approximation of high-temperature expansion of thermodynamic potential into the Gibbs energy of Fe-B-C melt, we obtain the surface of thermodynamic stability of Fe-B-C melt, depending on temperature and content of boron and carbon in the alloy. The findings show that in order to obtain the homogeneous Fe-B-C melt, which does not contain micro-inhomogeneous structures in the form of short-range microregions, it is necessary to perform overheating more than to 150 K.

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