球狀鑄鉄の凝固時後の収縮について:

概要

論文の詳細を見る
By comparing the shrinkage curve of nodular cast iron produced by magnesium and cerium addition with that of ordinary cast iron, the following results were obtained :— 1. The primary expansion of nodular iron is larger than that of ordinary iron. This is a reason of large amount of gas dissolved into the molten metal. Therefore magnesium or cerium dissolved into the molten metal in the state of gas and this gas prevents the free growth of graphite and induces the graphite to nodulize. 2. The growth of graphite is slower in nodular iron than in ordinary iron, but the final extent of graphitization is the same. And ordinary cast iron which has a large primary expansion and a small total construction, i. e. has much dissolved gasses and difficult graphitization is generally difficult to nodulize.
Japan Foundry Engineering Societyの論文