Fe-C-Si合金中のセメンタイトの安定性に及ぼす金属カルシウムの作用

概要

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In previous reports, it was deduced that, using calcium silicide as the calcium agent, calcium was the unstabilizer to the cementite in Fe-C-Si alloy. However, as the silicon dissolves into molten iron the calcium agent and the deoxidation takes place as a necessary consequence, effects of silicon and deoxidation exist, strictly speaking, in the experimental results obtained. Then, in this report, using metallic calcium as the calcium agent and adding it to the deoxidized molten iron (1.58-1.78%C), effect of calcium on the stability of cementite was again investigated. Deoxidation and the existence of silicon and calcium reduced the stability of cementite in Fe-C-Si alloy. The existence of calcium, however, surpasses the others is effect. The iron molten under vacuum and the calcium added iron had almost the same contents of oxygen. From the results obtained, it was concluded that the unstabilization of cementite was mainly caused by the direct effect of calcium itself, but not by the deoxidizing effect of calcium.
Japan Foundry Engineering Societyの論文