Structural state and thermodynamic stability of Fe-B-C alloys
| Autor: | N. Yu. Filonenko, A. N. Galdina, A. I. Babachenko, G. A. Kononenko |
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| Jazyk: | English<br />Ukrainian |
| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Фізика і хімія твердого тіла, Vol 20, Iss 4, Pp 437-444 (2020) |
| Druh dokumentu: | article |
| ISSN: | 1729-4428 2309-8589 |
| DOI: | 10.15330/pcss.20.4.437-444 |
| Popis: | 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. |
| Databáze: | Directory of Open Access Journals |
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