凝固中に晶出する酸化物の生成挙動に及ぼす一次脱酸生成物の影響

概要

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Effect of the primary oxide on the behavior of the oxide precipitated during solidification was investigated using Mn deoxidized steel which has primary oxides and soluble oxygen before solidification of the steel. The composition and size of oxides in the continuously cast steels were observed and theoretically analyzed. The results obtained are as follows. MnO-FeO and MnO-FeO-Al_2O_3 oxides were observed. The compositions of the oxides change with cooling rate of the steel and the size of oxide. The Al_2O_3 content of the oxide at low cooling rate is lower than that at high cooling rate. The Al_2O_3 content of the oxide decreases with the decrease in the size of the oxide. As a result of the theoretical analysis of the oxide behavior during solidification on the basis of a diffusion growth model, it has been found that MnO-FeO oxide is precipitated and grows regardless of primary oxide during solidification and MnO-FeO-Al_2O_3 oxide grows during solidification as MnO precipitates on the primary oxide which contains Al_2O_3.
社団法人日本鉄鋼協会の論文
1995-07-01