溶鋼組成による鋼塊中逆 V 偏析線密度の推定

概要

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A semi-empirical attempt has been made to evaluate the formation of A-segregates in ingots as a function of the solute concentration in steel melts. Measurements on 22 ingots of the sum of the length of A-segregates (N_A) found in unit area on the central longitudinal cross sections parallel to the narrow face of the ingots have given N_A=1.43(H/D)-0.42T_p+12.7φ+2.3 (cm/100cm^2) where H, D and T_p are height, width and taper of the ingot, respectively, and φ is the difference in the density between bulk melt and solute enriched melt remaining in the mushy zone. In deriving the above empirical equation, φ has been approximated by a linear function of the concentration, C^°_<Ln>, of n-th solute in the bulk melt as φ=-ΣI_nC^°_<Ln> where theoretical consideration has enabled us to determine the value of the coefficient, I_n, for each solute element. The above equation for N_A indicates that the movement activated by buoyancy of the remaining melt in the mushy zone plays a dominant role on the formation of A-segregates. This is confirmed by separate experiments where plate grade carbon steel with 0.043% silicon and 0.13% molybdenum has been cast in a 26t mold, resulting in significant decrease of N_A, about 1/4, in comparison with ingot of the same grade but with 0.34% silicon and no molybdenum.
社団法人日本鉄鋼協会の論文
1981-05-01