Thermodynamic analysis of solidification and malleablizing of white-heart malleable cast iron

• Published in: Metalurgija Vol. 45; no. 3; p. 197
• Main Authors: Pirnat, M, Medved, J, Mrvar, P
• Format: Journal Article
• Language: English
• Published: 01.07.2006
• ISSN: 0543-5846

The aim of this work is thermodynamic analysis of both phases at making castings from the white-heart malleable. We followed the solidification and cooling, and in the second phase the malleablizing of the cast iron. The result of this manner of the solidification is cast microstructure, which depends on the composition of the malleable and on the calling rate, which is formed at the solidification and eutectoid transformation. The cast microstructure is changed during the process of malleablizing. For the thermodynamic analysis of the white-heart malleable at different conditions we used (Thermo-Calc) computer simulation method, in-situ" dilatometry, simultaneous thermal analysis and laboratory dilatometric analysis. We examined our specimens with optical microscopy and performed certain mechanical analysis. The aim of these investigations is to create a model of solidification, cooling and malleablizing of white-heart malleable. With this model it is possible to determine the share of microstructure parts of thick-walled and thin-walled casting at known temperature, what in practice presents grate importance in determining the times of the malleablizing, in attaining of required mechanical properties and in optimizing of the process.