球狀黑鉛鑄鐵의 製造에 關한 硏究

다국어 초록 (Multilingual Abstract)

The effects of carbon, silicon on the structure and hardness at the time of Spheroidal Graphite Cast Iron production were studied in two stages, before and after inoculation. The Fading phenomena were also researched and the arrived conclusions are as follows;
(1) The effects of carbon and silicon on the before inoculation structure were equal. It is expedited to graphitize and ferritize as the percentage of carbon and silicon were increased, and thus the density and hardness were decreased.
(2) The effect of silicon on the after inoculation structure is greater than that of carbon; the more silicon was contained in the structure, the more it was expedited to graphitize and ferritize and hardness decreased.
(3) Fading time was longer at the hyper-eutectic than at the hypo-eutectic, especially silicon-content became higer and the fading time was longer.
(4) At the range of silicon-content 2.4% to 3.0%, carbon-content 3.1% to 3.7%, the fading time was 10 to 15 minutes, and it was flaked completely after 25 minutes from the inoculation. Therefore, hardness was not changed at all until 15 minutes after inoculation and sharply decreased thereafter.