ステンレス鋼塊の初期凝固組織に及ぼす界面活性元素の影響

概要

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18-8 stainless steel ingots which are added with surface active elements, Bi, Sn, Te are cast with the water cooled copper mold at the pouring speed of 10 mm/s. Transverse and longitudinal microstructures in the vicinity of the surface of ingots are observed. The solidification microstructures become fine and the effect of rapid quenching increases with increasing the amount of the surface active element. Primary dendrite arm spacing is about 50μm at the 50μm from the surface of ingot which is not added with the surface active element, but arm spacing is about 10μm in the case of 0.0055 mass%Bi addition. Corresponding cooling rate are 1×10^2 and 3×10^3 K/s, respectively. From temperature distribution in the water cooled copper mold, heat flux are calculated. The maximum value of heat flux in the mold increases and appears soon, when the surface active element is added. It is seemed that by the addition of the surface active element wettability increases, therefore heat transfer coefficient between molten steel and mold increases. Furthermore, the surface active element seems to have the effect of increase of nucleation rate.
社団法人日本鉄鋼協会の論文
1989-08-01