| Spheroidal graphite cast iron specimens of 2.5-5.8 carbon equivalent were casted into CO₂sand mold, 2-10㎜ thickness Y-block. Both, the microstructures and abrasion characteristics of the samples are studied. The results are as follows. 1) Even though the carbon equivalent is the same in the spheroidal graphite cast iron, the amounts of cementite and ferrite are different whenever the silicon and the carbon contents are different. 2) Under the present expermental conditions, the relationship between the abrasion speed and the abraded amount are: 0.5 m/sec for abrasive wear, 1 m/sec for corrosive wear and 4 m/sec for adhesive wear. 3) The amount of abraded material during corrosion wear increases as the cooling rate decreases for the same carbon equivalent and increases as the carbon equivalent. 4) The amount of abraded material during adhesive wear increase with the decreasing carbon equivalent and with the faster cooling rates for castings of 2-4㎜ in thickness. |
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