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Thermodynamic Description of Ternary Fe-B-X Systems. Part 7: Fe-B-C

Miettinen J., Visuri V.-V., Fabritius T., Vassilev G.

Archives of Metallurgy and Materials

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2020

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Vol. 65, iss. 2

923--933

EN

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 2700°C.

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Thermodynamic Description of Ternary Fe-B-X Systems. Part 6: Fe-B-Ti

Miettinen J., Visuri V.-V., Fabritius T., Milcheva N., Vassilev G.

Archives of Metallurgy and Materials

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2019

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Vol. 64, iss. 4

1249--1255

EN

Thermodynamic optimizations of the ternary Fe-B-Ti system and its binary sub-system, B-Ti are presented. The thermodynamic descriptions of the other binaries, Fe-Ti and Fe-B, are taken from the earlier studies slightly modifying the Fe-Ti system assessment. The adjustable parameters of the Fe-B-Ti and B-Ti systems are optimized in this study using the experimental thermodynamic and the phase equilibrium data from the literature. The solution phases of the system are described using the substitutional solution model and the compounds (including borides) are treated as stoichiometric phases. The results show a good correlation between the calculated and measured thermodynamic and phase equilibrium data.

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Thermodynamic Description of Ternary Fe-B-X Systems. Part 5: Fe-B-Si

Miettinen J., Visuri V.-V., Fabritius T., Milcheva N., Vassilev G.

Archives of Metallurgy and Materials

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2019

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Vol. 64, iss. 4

1239--1248

EN

Thermodynamic descriptions of the ternary Fe-B-Si system and its binary sub-system, B-Si, are developed in the context of a new Fe-B-X (X = Cr, Ni, Mn, V, Si, Ti, C) database. The thermodynamic parameters of the other binary sub-systems, Fe-Si and Fe-B, are taken from earlier assessments. Experimental thermodynamic and phase equilibrium data available in the literature has been used for the optimization of the thermodynamic parameters of the Fe-B-Si and B-Si systems. The solution phases are described using substitutional solution model and the compounds (silicides and borides) are treated as stoichiometric phases. The calculated and experimental thermodynamic and phase equilibrium data were found to be in good agreement.

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Thermodynamic Description of Ternary Fe-B-X Systems. Part 4: Fe-B-V

Miettinen J., Visuri V.-V., Fabritius T., Milcheva N., Vassilev G.

Archives of Metallurgy and Materials

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2019

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Vol. 64, iss. 2

451--456

EN

Thermodynamic descriptions of the ternary Fe-B-V system and its binary sub-system B-V, are developed using experimental thermodynamic and phase equilibrium data from the literature. The thermodynamic parameters of the other binaries, Fe-V and Fe-B, are taken from earlier assessments slightly modifying the Fe-V description. The work is in the context of a new Fe-B-X (X = Cr, Ni, Mn, V, Si, Ti, C) database. The solution phases are described using substitutional solution model. The borides are treated as stoichiometric or semistoichiometric phases and described with two-sublattice models.