Abstract
Changes in the stable and metastable eutectic temperatures and compositions of the iron-carbon system by addition of alloying elements were calculated on the basis of the geometrical thermodynamics. The influences of alloying elements on these temperatures and compositions exhibit periodicities. The periodicities of the influences on the stable and metastable eutectic temperatures have a maximum in raising these temperatures, and the periodicities of the influences on the eutectic compositions have a maximum in lowering them, in each periodic row. The calculation of eutectic temperatures was extended to Fe-C base multicomponent alloys, and the calculated eutectic temperatures Were in good agreement with experimental ones given by Oldfield.
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