Thermal analysis of Fe-carbide and Fe-C mixtures
Keywords:Differential thermal analysis, Iron, Carbides
AbstractDifferential thermal analysis (DTA) was employed to monitor changes which occurred during heating of Fe-carbide and Fe-C mixtures. The DTA curves showed a relationship between endothermic peaks and phase transformations given in the Fe-C phase diagram. The transformations included (i) magnetic Fe to non-magnetic Fe, (ii) pure Î±-Fe to pure Î³-Fe, (iii) Î³ + Fe3C â†’ Liquid and (iv) pure Î³-Fe to pure Î´-Fe. Melting of the Fe-SiC powder compacts when sintered at temperatures higher than 1200Â°C was revealed and indicated by the endothermic peak of 1230Â°C. This peak corresponded to the transformation of Î³ + Fe3C â†’ Liquid. That meant that decomposition of SiC particles had occurred, and Si and C atoms subsequently diffused into iron particles. DTA curves of the Fe-TiC, Fe-WC and Fe-VC mixtures did not show peaks corresponding to melting. This indicated that TiC, WC and VC were stable when they were brought into contact with iron at elevated temperatures.
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