It is known that the temperature of the appearance and disappearance of cementite contained in different structures of iron-carbon alloys differs substantially. We have shown [1] that the magnetic properties of cementite formed from austenite (i.e., eutectoid and secondary cementite) differ from those of cementite crystallized from a liquid (eutectic and primary cementite). However, we have not been able to establish a difference in the properties of cementite within one group.In the present work we studied the microhardness of cementite in synthetic hypereutectic white cast iron melted in an IST-006 induction furnace from steel U8 (as received) and chips of graphite electrodes. Specimens 8 mm in diameter and 20 mm long were cast into green sand-and-clay molds. The microhardness was measured on a PMT-3M device under a load of 0.2 and 0.5 N. Figure 1 presents the microstructure of the investigated alloy (4.5% C, 0.2% Si, 0.3% Mn, 0.02% P, and 0.02% S), which is typical for hypereutectic cast iron. The microhardness of primary (Ce I ) and eutectic (Cee) cementites was measured. The results of the measurements were processed statistically. It can be seen from Table 1 that the microhard-1 Rybinsk State Aircraft Technology Academy, Rybinsk, Russia.
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