Interaction Energy in the Melts of the Fe-Mn-Si-C-Ti System

DOI: 10.62564/M4-OB1145

Oksana Baranovska, Larysa Romanova, Valentina Sudavtsova, Gennadii Bagliuk

Frantsevich Institute for Problems of Materials Science National Academy of Science of Ukraine


Ferrosilicomanganese (Fe0.21Mn0.62Si0.14C0.07) and silicomanganese are widely used in metallurgical and materials science industries due to their ability to melt at low temperatures. The addition of reactive titanium leads to the formation of various phases, each possessing unique properties. Thorough study of their thermodynamic properties, particularly the melts, is essential for optimizing technological processes. However, determining these properties is complex and time-consuming. Preliminary evaluation using geometric and Redlich-Kister-Muggianu models across concentration ranges is advisable, based on data from limiting binary systems. In the work [1], the thermochemical properties of melts of the Fe-Mn-Si system were determined by calorimetry at 1873 K. Comparison of experimental and predicted thermochemical properties of melts of the Fe-Mn-Si system showed that the best agreement is characteristic for the Redlich-Kister-Muggianu model with a ternary contribution of 300 kJ/mol. Applying the same model, thermochemical characteristics of melts of ternary systems Fe(Mn)-Si-Ti, Fe-Mn-Ti, and Si-Ti-C were calculated across the entire concentration range. It was found that the minimum enthalpy of mixing corresponds to the melts of Si-Ti is -70 kJ/mol, Fe-Ti is -20 kJ/mol, and Ti-C is -115 kJ/mol, indicating predominance of pairwise interactions. This is supported by the results of X-ray diffraction analysis (XRD) and electron microscopy studies. However, according to XRD, the synthesis of the mentioned metal-matrix composites (MMCs) results in the formation of the ternary compound Ti3SiС2. According to our modeling, melts of such composition exhibit a significant heat release (-110 kJ/mol), suggesting the formation of such a compound is expected. The formation of various binary and ternary phases enhances the strength, hardness, and other properties of the metal-matrix composites.

Keywords
Ferrosilicomanganese, silicomanganese, phase, enthalpy, thermochemical properties

Acknowledgments
Not provided

References
[1] Bondarenko, T. P., Sudavtsova, V. S., Batalin, G. I., Ulyanov, V. I. Enthalpies of mixing of liquid Fe-Si-Mn alloys // Proceedings of the USSR Academy of Sciences. Metals. – 1984. – No. 3. – pp. 81-82.