Thermodynamics of the Oxygen Solutions in Titanium-Containing Fe–Co–Cr Melts
- 5 Downloads
A thermodynamic analysis of the influence of titanium on the oxygen solubility in Fe–Co–Cr melts at 1873 K is performed. The dependences of the oxygen solubility in Fe–Co–Cr melts on the titanium content are calculated. The titanium content at which the deoxidation reaction mechanism is changed (Cr2O3 \( \rightleftarrows \) Ti3O5) is as follows: 2.602 × 10–3% Ti for the Fe–10% Co–10% Cr alloy and 2.975 × 10–3% Ti for the Fe–20% Co–25% Cr alloy. A low titanium content insignificantly increases the oxygen concentration determined by the chromium content. At a higher titanium content (after the change of the mechanism of interaction of chromium and titanium with oxygen, when titanium determines the oxygen solubility in the melts), the oxygen concentration substantially decreases and, then, increases after passing a minimum point at a titanium content of ~0.9%. The minimum oxygen concentrations of these alloys are 1.8 × 10–3 and 3.9 × 10–3%, respectively.
Keywords:Fe–Co–Cr system titanium melts oxygen solubility
This work was performed in terms of a state assignment no. 007-00129-18-00.
- 1.G. F. Korznikova, “Effect of the mode of hot deformation on the structure and properties of magnetically hard alloys of the Fe–Cr–Co system,” Met. Sci. Heat Treat. 48 (1–2), 76–80 (2006).Google Scholar
- 2.A. Korneva, M. Bieda, G. Korznikowa, K. Sztwiertnia, and A. Korznikov, “Microstructure and some properties of FeCr25Co15 alloy subjected to plastic deformation by complex load,” Int. J. Mater. Res. (Z. Metallkd.) 99 (9), 991–998 (2008).Google Scholar
- 3.J. M. Vaitek, M. P. Braidy, J. A. Khorton, Jr., “Correction of alloy composition to reach selected properties in heater at limited temperature,” RF Patent 2 441 138, Bull. Isobret., No. 3 (2012).Google Scholar
- 4.T. Miki, “Dilute solutions,” in Treatise on Process Metallurgy. Vol. 1: Process Fundamentals, Ed. by S. Seetharaman (Elsevier, Amsterdam, 2014), pp. 557–585.Google Scholar
- 6.A. A. Aleksandrov, V. Ya. Dashevskii, and B. V. Linchev-skii, “Thermodynamics of the oxygen solutions in chromium-containing melts of the Fe–Co system,” Rus. Met. (Metally), No. 9, 681–687 (2014).Google Scholar
- 7.N. P. Lyakishev and M. I. Gasik, Chromium Metallurgy (ELIZ, Moscow, 1999).Google Scholar
- 10.A. A. Aleksandrov, V. Ya. Dashevskii, and L. I. Leont’ev, “Solubility of Oxygen in Fe–Co Melts Containing Titanium,” Steel Transl. 47 (3), 178–187 (2017).Google Scholar
- 11.J.-O. Jo, W.-Y. Kim, C.-O. Lee, and J.-J. Pak, “Thermodynamic interaction between chromium and titanium in liquid Fe–Cr alloys containing 30 wt % Cr,” ISIJ International 50 (10), 1373–1379 (2010).Google Scholar
- 12.L. N. Belyanchikov, “Estimation of the interaction parameters, activity coefficients, and heat of solution of elements in cobalt-based alloys by the conversion from their values in iron alloys,” Elektrometallurgiya, No. 4, 16–22 (2009).Google Scholar
- 13.V. Ya. Dashevskii, A. A. Aleksandrov, and L. I. Leont’ev, “Thermodynamics of Oxygen Solutions in Fe–Ni, Fe–Co and Co–Ni Melts,” Steel Transl. 45 (1), 42–48 (2015).Google Scholar
- 14.N. P. Lyakishev and M. I. Gasik, Physicochemistry and Technology of Electroferroalloys (ELIZ, Moscow, 2005).Google Scholar