Calculating Model of Mass Action Concentrations for Mn-C Melts and Optimization of Thermodynamic Parameters

Jian Zhang

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    Jian Zhang, Calculating Model of Mass Action Concentrations for Mn-C Melts and Optimization of Thermodynamic Parameters, J. Univ. Sci. Technol. Beijing , 5(1998), No. 4, pp.208-211.
    Jian Zhang, Calculating Model of Mass Action Concentrations for Mn-C Melts and Optimization of Thermodynamic Parameters, J. Univ. Sci. Technol. Beijing , 5(1998), No. 4, pp.208-211.
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    Metallurgy

    Calculating Model of Mass Action Concentrations for Mn-C Melts and Optimization of Thermodynamic Parameters

    • Metallurgy School, University of Science and Technology Beijing, Beijing 100083, China

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    中文摘要

    Based on the phase diagram, the coexistence theory of the metallic melt structure involving compound formation and the regularity of melts containing saturated phase, a calculating model of mass action concentrations for Mn-C melts was formulated. According to the activities (or activity coefficients γMn and γC), obtained by the Unified Interaction Parameter Model (UIPM), the thermodynamic parameters △GMn3C⊝ and △GMn5C2⊝ at higher temperatures (1628~1873 K) were optimized by the repeated try and error method. It is testified that △GMn23Cn⊝, △GMn15C4⊝(873~1273 K) and △GMn7C3⊝ (298~1623 K), obtained at lower temperatures, can also be used at the above-mentioned higher temperatures. The calculated NMn and NC agree well with αMn and αC obtained by UIPM. This result shows that the deduced model can reflect the structural reality of Mn-C melts.

     

    Metallurgy

    Calculating Model of Mass Action Concentrations for Mn-C Melts and Optimization of Thermodynamic Parameters

    Author Affilications

      • Metallurgy School, University of Science and Technology Beijing, Beijing 100083, China

    • Received: 27 April 1997;
    Based on the phase diagram, the coexistence theory of the metallic melt structure involving compound formation and the regularity of melts containing saturated phase, a calculating model of mass action concentrations for Mn-C melts was formulated. According to the activities (or activity coefficients γMn and γC), obtained by the Unified Interaction Parameter Model (UIPM), the thermodynamic parameters △GMn3C⊝ and △GMn5C2⊝ at higher temperatures (1628~1873 K) were optimized by the repeated try and error method. It is testified that △GMn23Cn⊝, △GMn15C4⊝(873~1273 K) and △GMn7C3⊝ (298~1623 K), obtained at lower temperatures, can also be used at the above-mentioned higher temperatures. The calculated NMn and NC agree well with αMn and αC obtained by UIPM. This result shows that the deduced model can reflect the structural reality of Mn-C melts.

     

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