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Abstract
Thermal analysis in foundry is performed by measuring the melt temperature during the free cooling in cups. Information on liquidus, eutectic, solidus temperatures and recalescence effects is collected. Advanced analyses in the laboratory use differential devices where a temperature program is imposed to both the sample and an inert reference. The sensitivity in the detection of temperature points is enhanced and quantitative determination of the heat release becomes feasible.
In this work we have employed a high temperature differential scanning calorimeter to follow melting, solidification and eutectoid transformations of master alloys for the production of lamellar, compact graphite and spheroidal cast irons under protective helium atmosphere.
A high silicon ductile iron alloyed with 2% wt. Al, devised for application in engine components, was analysed as well.
The correlation between thermophysical data obtained by calorimetry, free cooling in cups and microstructure is shown.