鉄凝固時の気孔生成と抑制に関するモデル解析

概要

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CO blowhole formation on the surface of the continuously cast slab is one of the most important problems in continuous casting of slightly deoxidized steel, such as pseudo-rimmed steel. Model experiment with aerated water was carried out in order to understand the mechanism of CO blowhole formation and suppression with molten flow during solidification of steel. The results obtained are summarized as follows. 1) Equilibrium distribution constant of CO_2 is estimated to evaluate the CO_2 blowhole formation and suppression quantitatively. 2) The shape of CO_2 blowholes chiefly depends on the concentration of CO_2 at the solidification front and the solidification rate. 3) CO_2 blowholes are suppressed completely with fluid flow at the certain velosity which is related to CO_2 content of aerated water. 4) The models of blowhole formation and suppression based of the experimental results are proposed. The calculated results agree well with the measured value.
社団法人日本鉄鋼協会の論文
1983-10-01