Thermodynamic description of ternary Fe–B–X systems : part 7: Fe–B–C
Miettinen, J.; Visuri, V.-V.; Fabritius, T.; Vassilev, G. (2020-05-08)
Miettinen, J.; Visuri, V.-V.; Fabritius, T.; Vassilev, G. (2020) Thermodynamic description of ternary Fe–B–X systems : part 7: Fe–B–C. Arch. Metall. Mater. 65(2): 923-933. https://doi.org/10.24425/amm.2020.132840
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https://urn.fi/URN:NBN:fi-fe2020062445553
Tiivistelmä
Abstract
Thermodynamic description of the Fe-B-C system in its iron-rich corner is developed in the context of a new Fe-B-X (X = Cr, Ni, Mn, Si, Ti, V, C) database. The thermodynamic parameters of the binary sub-systems, Fe-B, Fe-C and B-C, are taken from earlier assessments modifying the B-C description. The parameters of the Fe-B-C system are optimized in this study using experimental thermodynamic and phase equilibrium data from the literature. Liquid, beta-rhombo-B and graphite phases are described using the substitutional solution model, while the ferrite (bcc), the austenite (fcc), the cementite (M₃C) and the M₂₃C₆ phases are described with the sublattice model and the borides, Fe₂B, FeB and B₄C, are treated as stoichiometric phases. A good correlation was obtained between the calculated and the experimental thermodynamic and phase equilibrium data. The description is recommended to be used at the composition region of wt% C + wt% B < 15 and at temperatures below 2700oC.
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