1561 Table 1. Solubility of nitrogen in liquid Fe-Ti alloys. Fig. 1. Solubility of nitrogen in liquid irontitanium alloys at Ž.

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1560 Effect of Alloying Element on the Solubility of Nitrogen in Liquid Iron Fujio ISHII and Tasuku FUWA Synopsis: Solubilities of nitrogen in liquid Fe-Ti, Fe-V, Fe-Cr, Fe-Mo, and Fe-W alloys are determined in the temperature range of 1 580 to 1 680 Ž by sampling method. The results obtained show that addition of Ti, V, Cr, Mo, and W increases the solubility of nitrogen in liquid iron. The effects of alloying elements on the activity of nitrogen in liquid iron at 1 580 Ž are expressed as follows:

1561 Table 1. Solubility of nitrogen in liquid Fe-Ti alloys. Fig. 1. Solubility of nitrogen in liquid irontitanium alloys at 1 680 Ž.

1562 Fig. 4. Comparison of the effect of titanium on the activity coefficient of nitrogen in liquid iron. Fig. 2. Relation between [%N]/ ãpn, and [%Ti] in liquid iron. Fig. 3. Effect of titanium on the activity coefficient of nitrogen in liquid iron.

1563 Table 2. Solubility of nitrogen in liquid Fe-V alloys. Fig. 6. Effect of vanadium on the activity coefficient of nitrogen in liquid iron at 1 580-1680 Ž. Table 3. Solubility of nitrogen in liquid Fe-Cr alloys. Fig. 5. Solubility of nitrogen in liquid ironvanadium alloys at 1 580 Ž.

1564 Fig. 7. Solubility of nitrogen in liquid ironchromium alloys. Table 4. Solubility of nitrogen in liquid Fe-Mo alloys. Fig. 8. Effect of chromium on the activity coefficient of nitrogen in liquid iron. Fig. 9. Comparison of the effect of chromium on the activity coefficient of nitrogen in liquid iron. Fig. 10. Solubility of nitrogen in liquid ironmolybdenum alloys. Fig. 11. Effect of molybdenum on the activity coefficient of nitrogen in liquid iron at 1580 1 680 Ž.

1565 Fig. 13. Effect of tungsten on the activity coefficient of nitrogen in liquid iron at 1 580 Ž. Table 5. Solubility of nitrogen in liquid Fe-W alloys. Fig. 12. Solubility of nitrogen in liquid irontungsten alloys. Fig. 15. Effects of alloying elements on In rk in liquid iron at 1 580 Ž.

1566 Table 6. Interaction parameters of nitrogen in liquid iron.

1567 Table 7. Standard free energies of formation of nitrides. Fig. 16. Ralation between atomic number and interaction parameter of nitrogen si,j, in liquid iron alloys at 1 580 C. forma- Fig. 17. Standard free energy of nitride tion 1G, and interaction parameter sk. 5) M. M. RAO and N. PARLEE: Memo. Sci. Rev. Met., 58 (1961), p. 52 6) D. B. EVANS and R. D. PEHLKE: Trans. Met. Soc. AIME, 233 (1965), p. 1620 7) W. P. FISCHER, H. FRYE, H. J. FLEISCHER, and R. BAUM: Arch. Eisenhattenw., 43 (1972), p. 291

1568 8) A. N. MOROZOV, V. F. IsAEv, and L. G. Ko- ROLEV: Izv. Akad. Nauk SSSR, Metally, (1963) 4, p. 141 (1957), p. 569 10) R. M. BRICK and J. A. CREEVY: Metals Tech., 7 (1940) Tech. Pub., No. 1165 11) V. KASHYAP and N. PARLEE: Trans. Met. Soc. AIME, 212 (1958), p. 86 13) R. D. PEHLKE and J. F. ELLIOTT: Trans. Met. Soc. AIME, 218 (1960), p. 1088 33 (1969), p. 720 17) K. GuNJI, K. SuDO, and E. ISHIKAWA : The 4th Japan-USSR Joint Sym. on Phy. Chem. of Met. Processes (1973), p. 185 18) Yv. M. POMARIN, G. M. GRIGORENKO, and V. I. LAKOMSKII: Izv. Akad. Nauk SSSR, Metally, (1975) 5, p. 74 19) T. SAITO: Sci. Rep. RITU, A-1 (1949), p. 419 20) T. KOOTZ: Arch. Eisenhtittenw., 15 (1941), p. 909 21) H. WENTRUP and 0. REIF: 20 (1949), p. 359 22) K. T. KUROCHIKIN, P. V. GEL1D, and V. I. YAVOISKII: Doklady Akad. Nauk SSSR, 84 (1952), p. 329 23) J. C. HUMBERT and J. F. ELLIOTT: Trans. Met. Soc. AIME, 218 (1960), p. 1076 24) P. H. TURNOCK and R. D. PEHLKE: 236 (1966), p. 1540 32 (1968), p. 933 26) D. COSMA: Arch. Eisenhattenw., 41 (1970), p. 195 27) V. I. LAKOMSKII, G. M. GRIGORENKO, G. F. TROKHOV, and Yu. M. POMARIN: The 3rd Japan-USSR Joint Sym. on Phy. Chem. of Met. Processes (1971), p. 72, Doklady Akad. Nauk Ukrain RSR., (1972) 3, p. 268, Izv. Akad. Nauk SSSR, Metally (1972) 4, p. 32 28) H. WADA and R. D. PEHLKE: Met. Trans. B, 8B (1977), p. 443 29) H. SCHENCK, M. G. FROHBERG, and H. GRAF: Arch. Eisenhuttenw., 29 (1958), p. 673 30) H. SCHENCK, M. G. FROHBERG, and H. HEINEMANN: ã, 33 (1962), p. 593 31) H. WADA and R. D. PEHLKE: Met. Trans. B, 8B (1977), p. 675 32) M. OHTANI and N. A. GOKCEN: Trans. Met. Soc. AIME, 218 (1960), p. 533 (1955), p. 217 34) E. T. TORKDOGAN, R. A. HANCOCK, S. I. HERLITZ, and J. DENTAN: JISI, 183 (1956), p. 69 35) F. NEUMANN and H. SCHENCK: Arch. Eisenha ttenw., 30 (1959), p. 477 36) D. B. EVANS and R. D. PEHLKE: Trans. Met. Soc. AIME, 230 (1964), p. 1657 37) H. SCHENCK, M. G. FROHBERG, and H. GRAF: Arch. Eisenhattenw., 30 (1959), p. 533 p. 746 39) J. F. ELLIOTT and M. GLEISER: Thermochemistry for Steelmaking, 1 (1959) [Addison- Wesley] 40) O. R. STULL and H. PROPHET: JANAF thermochemical tables, 2nd ed. (1971) 42) H. SCHENCK and E. STEINMETZ: Arch. Eisenhtittenw., 39 (1968), p. 255 43) V. F. ISAEV and A. N. MoRozov: Izv. Ak ad. Nauk SSSR, Metally (1964), 2, p. 13 44) J. CHIPMAN: TISI. 180 (1955). p. 97

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