連続鍛圧法によるブルーム鋳片の偏析制御機構

概要

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A continuous forging process has been put into operation to prevent the formation of centerline segregation in continuously cast bloom. In the process, the solidifying bloom is continuously forged down by a pair of anvils installed in the strand so that the solidifying shells are pressed into contact each other. In consequence of the application of the forging process on the casting, internal properties such as macro-and semimacro-segregation of the bloom are markedly improved. Segregation ratio of carbon at central part in the bloom can be controlled at the aimed value between 0.6 and 1.0 depending on the central solid fraction in the bloom at forging. A mathematical model which explains the discharge of solute enriched liquid from the solid-liquid coexisting region to the upper liquid region was developed. The calculated result shows that discharge ratio of liquid out of the solid-liquid coexisting region increases as solid fraction decreases. The discharge ratio is approximately equal to that of the fractional solidification refining reported by Flemings et al. The macro-segregations calculated from the model are in good agreement with observed ones for carbon, manganese, phosphorus and sulphur.
社団法人日本鉄鋼協会の論文
1993-04-01