フェライト化焼鈍した球状黒鉛鋳鉄の耐衝撃性に及ぼすひ素，アンチモン及びそう鉛の影響
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The influences of small amount of additives such as As, Sb and Bi on the impact property of ferritic-annealed spheroidal graphite cast iron was investigated. Specimens were prepared from high purity pig iron by melting in a Kryptol furnace and pouring into a small Y-block CO2 mold. The composition of the specimens was 3.6%C, 2%Si, nil∼0.08%As, 0.001∼0.023%Sb and nil∼0.017%Bi. No remarkable change in the maximum impact value was produced by the element of As up to 0.06%, but there was a slight decrease in maximum impact value from 0.09%As. The transition curve moved to the low temperature region at 0.036%As and the temperature (Ti) at which maximum impact value began to decrease fell about 25°C. No remarkable change in the maximum impact value appeared by the amount of Sb up to 0.0025%, but the maximum impact value decreased to 70% and 40% of that of base specimen when the Sb content was 0.005% and 0.013%Sb. In the two specimens with 0.0025% and 0.005%Sb, (Ti) was lower by 39°C in both specimens. In the specimen containing 0.0025%Sb, a very high impact value of about 3kgm/cm2 was maintained even at a temperature as low as −50°C. The maximum impact value was slightly decreased by Bi up to 0.0003% and was lower by about 70% of that of base specimen at 0.0006%Bi. In both specimens containing 0.0003% and 0.0006%Bi, (Ti) fell about 26°C in the former and 31°C in the latter, respectively. The specimen containing 0.0003%Bi showed a comparatively high impact value of about 2.5kgm/cm2 at a low temperaure of −50°C. The lowering of maximum impact values by the addition of relatively large amount of As, Sb and Bi was related to the deterioration of the shape of graphite particles which act as cracks. The harm done by the additives was large in the following order : As<Sb<Bi. The impact properties of the specimens were improved when only a small amount of these elements Sb, Bi, (As) were added. The beneficial effect seemed to be related to the increase in plastic deformation at grain boundaries caused by segregation of these elements with low melting point. In the specimens containing As, the grain refinement was another factor.
- Japan Foundry Engineering Societyの論文
Japan Foundry Engineering Society | 論文
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