鑄鐵に及ぼす Ca の影響に就いて (I)

概要

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The following studies were made to ascertain the effects of calcium silicide on the microstructure and chemical properties of nickel cast iron (Ni 5-50%, C 3.57%, Si 1.15%, Mn trace, P 0.035%, S 0.013%) and hypereutectic cast iron. Through the result of these studies, the following facts were found : 1) In the case of nickel cast iron containing more than 25% of Ni, the spheroidal graphite was made by adding 3% of calcium silicide. But those with more than 10 per cent of Ni change into the spheroidal graphite by adding 5% of calcium silicide. 2) In the case of hypereutectic cast iron with no Ni, the spheroidal graphite cast iron was formed by addition of 5 to 10% of calcium silicide. The spheroidal graphite cast iron having the following chemical composition and mechanical properties was made when 9% of calcium silicide was added to the Swedish charcoal pig iron of Table 4. C 4.14% Si 3.73% P 0.05% Mn 0.4% S 0.01% T.S. 62kg/mm Elg. 14% Rockwel-B 78.6. 3) The inner shrinkage cavity of the spheroidal graphite cast iron made by calcium silicide addition was smaller than in the case of Mg addition and the running property of this iron was extremety good. 4) There often appeared snow-flake graphite in this cast iron.
社団法人日本鉄鋼協会の論文
1952-06-25