Simulation of solidification paths in high chromium white cast irons for wear applications
Schon, C. G.
Is part ofCalphad-computer Coupling of Phase Diagrams and Thermochemistry
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Thermodynamic calculations of the solidification paths in the Fe-Si-Cr-C system using the CALPHAD approach have been used for the interpretation of the solidification microstructures of high chromium white cast irons containing high silicon contents. the results show a reasonable agreement between experiments and calculations for alloys up to 2 wt% Si. the results suggests that the stability of the cementite phase is underestimated in the thermodynamic database,The calculations predict a change in the topology of the phase diagram, with the cementite primary field disappearing in favour of a new ternary eutectic involving liquid, austenite, graphite and M7C3 carbide, this is partially in agreement with the observed microstructures for the alloys containing 4 wt%Si. the calculations predict the existence of a complex invariant peritectic reaction involving liquid, graphite, austenite, cementite and M7C3 carbide in the Fe-Si-Cr-C system.
CitationCalphad-computer Coupling of Phase Diagrams and Thermochemistry. Oxford: Pergamon-Elsevier B.V., v. 22, n. 4, p. 437-448, 1998.
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