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

Filonenko, N.Yu. and Galdina, A.N. and Babachenko, A.I. and Kononenko, G.A. (2019) Structural State and Thermodynamic Stability of Fe-B-C Alloys. Physics and chemistry of solid state, Фізика і хімія твердого тіла, Т. 20 (№ 4). pp. 437-444. ISSN 1729-4428

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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. From the data of microstructure analysis, X-ray structural and differential thermal analyses, we determined the primary phases formed as a result of crystallization of Fe-B-C system alloys, depending on content of boron and carbon in the alloy. 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.

Item Type:	Article
Additional Information:	[email protected] [email protected], [email protected]
Uncontrolled Keywords:	Fe-B-C system alloys, Fe2B boride, Fe3(CB) boron cementite, eutectics, thermodynamic. stability of the melt.
Subjects:	Physics
Divisions:	Departments > Department of Medical and Biological Physics and Informatics
Depositing User:	Аліна Чеботарьова
Date Deposited:	25 Aug 2020 08:15
Last Modified:	25 Aug 2020 08:16
URI:	http://repo.dma.dp.ua/id/eprint/5625

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