キルド鋼塊の逆 V 偏析におよぼす鋼塊形状と成分の影響

概要

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Aluminum-killed-steel slab ingots, whose weight was 5 to 40 t with various chemical compositions, were cast in order to investigate the influence of ingot shape and chemical composition on the formation of inverse-V segregation. Manganese content in the cross section of segregated streakes were obtained by line analysis with EPMA. The results were as follows : 1) The average number of inverse-V segregation in the ingots had a relationship with ingot thickness D(mm) and density-change coefficient(ε), as shown in the next formula. N^^-_<20∿70>=-21.57+52.84ε+0.025D 2) Inverse-V segregation streakes concentrated below the hot top in big-end-up ingots of larger wide face taper and taller ingots. 3) Inverse-V segregation was assumed to be formed by the interdendritic fluid flow in the region which had the fraction of solid between 0.51 and 0.86.
社団法人日本鉄鋼協会の論文
1987-07-01