Mechanism of formation of diamond crystals in iron-carbon alloys

Shift of the eutectic point of the Fe−C system in spheroidizing modification of cast iron

“…In this case the shift of the eutectic point and hence the redistribution of the valence electrons of carbon are caused by intensification of the chemical interaction of the Fe and C atoms in the Fe-C system, specifically, by increased carbon dissolution in the modified melt. On the whole, the resuits obtained confirm experimentally the concepts of [1,4,5] that relate the mechanism of spheroidizing modification of cast iron to changes in the kind of atomic interaction in the modified alloy. …”

“…It should be noted that in practical spheroidizing modification of cast iron this effect is equivalent to the application ofa I-GPa excess pressure to the melt [1].In the present work 2 we studied the microstructure of modified white cast iron (Fe-3.76%C) melted in an IST-006 induction furnace from commercial iron and chemically pure graphite. At 1400~ the melt was modified by metallic magnesium in an amount of 0.5%.…”