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Thermodynamic assessment of liquid Fe-Mn-C system

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Abstract

The lattice site ratio model proposed by Chipman describes the activity of the interstitial solutes in the alloy systems in terms of the ratio of filled to unfilled sites as a concentration parameter. Chipman and co-workers successfully applied the model to describe the solution behavior of C and S in the various alloy systems. The meaning of the lattice for the liquid system is not same as that for the solid system, as it does not retain the rigidity of a solid crystalline structure and a long-range order in the atomic arrangement. Still, the liquid system maintains a short-range order with a similar structure to that of the close-packed solid system, and the application of the lattice site ratio model to the liquid system is justified. The present study assessed the thermodynamic properties of the liquid Fe-Mn-C system with the use of the lattice site ratio model. It was found that the solution properties of the ternary Fe-Mn-C system can be represented as linear combinations of those of the constituent binary systems if they are defined in the lattice site ratio model. This is not the case when the solution properties are given in the mole fraction coordinate. The lattice site ratio model reproduced closely the experimentally determined solubility of C and the activities of C and Mn in the Fe-Mn-C system.

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  1. the Elkem Metals Company, 45750-0299, Marietta, OH

    Young E. Lee (Senior Specialist)

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  1. Young E. Lee
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Lee, Y.E. Thermodynamic assessment of liquid Fe-Mn-C system. Metall Mater Trans B 29, 397–403 (1998). https://doi.org/10.1007/s11663-998-0116-9

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  • DOI: https://doi.org/10.1007/s11663-998-0116-9

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