鑄鋼の高温亀裂に關する研究(第 3 報)

概要

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On the previous paper, the effect of compositions on the hot tear of steel castings were studied. And in this paper, another factors affecting the hot tear have been studied. The results obtained by these investigations are summarized as follows : - 1. The chief cause of the hot tear of steel castings is S, which remains in the grain boundary of primary crystals as FeS fluid film when steel castings solidify. 2. To prevent perfectly this hot tear, no compositional element is available, only Mn is most available for decreasing the hot tear. And for 0.01%S, 0.70% Mn or more is necessary. 3. No doubt, the thermal stress in the steel castings which occur during solidification is the cause of the hot tear. 4. To decrease this thermal stress, green sand mould is more effective than dry sand mould. 5. To prevent the hot tear chill and rib are very effective. 6. Most important idea is not to leave hot spot in the casting during solidification for preventing the hot tear.
社団法人日本鉄鋼協会の論文
1948-08-31