A thermodynamic analysis of the system Fe-Cr-Ni-C-O

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Luoma, Rauno
dc.date.accessioned 2012-02-10T09:45:08Z
dc.date.available 2012-02-10T09:45:08Z
dc.date.issued 2002-12-05
dc.identifier.isbn 951-22-6097-2
dc.identifier.issn 1239-0518
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/2249
dc.description.abstract A thermodynamic database for the system Fe-Cr-Ni-C-O has been built using previously assessed binary and ternary systems. Six ternary systems, Fe-Cr-O, Fe-C-O, Fe-Ni-O, Cr-Ni-O, Cr-C-O, and Ni-C-O, have been assessed. Quaternary and quinary systems were calculated using only interpolation models. This method of building a database is known as the Calphad method and it is widely used in modern thermodynamics. An associated solution model with a non-ideally interacting species, namely 'Fe', 'Cr', 'Ni', 'C', 'FeO', 'FeO1.5', 'Cr2/3O', and 'NiO' was used for the liquid phase. The solid metallic phases were described using the sublattice model with carbon and oxygen on the second sublattice, and solid oxide phases were described using the compound energy model. The carbide phases were treated as stoichiometric or semistoichiometric phases. The optimisation was performed using the Parrot module included in the Thermo-Calc program. The model parameters for the liquid phase in metal-oxygen systems were transformed from the parameters optimised with the ionic liquid model by other authors. Because of the new assessments of the binary systems, all the ternary systems including oxygen were optimised. Only in the Ni-C-O system could the parameters not reproduce the experimental data. The calculated quaternary systems are in good agreement with the experimental data without using any quaternary parameters. The model parameters assessed in this work describe the system Fe-Cr-Ni-C-O well according to the experimental information from its sub systems. The complete Gibbs energy expressions for the alloy phases were presented, allowing the calculation of the phase diagrams and thermodynamic mixing properties of the mixture phases. en
dc.format.extent 91
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Helsinki University of Technology en
dc.publisher Teknillinen korkeakoulu fi
dc.relation.ispartofseries Acta polytechnica Scandinavica. Ch, Chemical technology series en
dc.relation.ispartofseries 292 en
dc.subject.other Geoinformatics en
dc.title A thermodynamic analysis of the system Fe-Cr-Ni-C-O en
dc.type G4 Monografiaväitöskirja fi
dc.description.version reviewed en
dc.contributor.department Department of Materials Science and Rock Engineering en
dc.contributor.department Materiaali- ja kalliotekniikan osasto fi
dc.subject.keyword C-Cr-Fe-Ni-O-system en
dc.subject.keyword phase diagrams en
dc.subject.keyword activities en
dc.subject.keyword thermodynamic modelling en
dc.identifier.urn urn:nbn:fi:tkk-002195
dc.type.dcmitype text en
dc.type.ontasot Väitöskirja (monografia) fi
dc.type.ontasot Doctoral dissertation (monograph) en
dc.contributor.lab Laboratory of Metallurgy en
dc.contributor.lab Metallurgian laboratorio fi

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