Abstract
The interphase boundaries in gray and ductile cast iron were studied with a scanning Auger microprobe (SAM). Sulfur and oxygen were found to be adsorbed at the flake/ metal interfaces in the gray iron, while the nodule/metal and intercrystalline graphite interfaces in the ductile iron were free of foreign elements. The only magnesium detected in the magnesium modified ductile iron was combined with phosphorus and sulfur as a compound. A model is presented which proposes that Fe−C−Si eutectic alloys in the absence of surface active impurities (such as in vacuum casting of high purity materials) produce nodular graphite due to the inherent instability of the graphite/melt interface. The sulfur and oxygen always present in commercial alloys adsorb at the graphite/melt interface, effectively “stabilizing” the active sites on the graphite basal planes, and preventing spherulitic growth. The purpose of modifiers is to getter these impurities.
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B. Lux:Giessereiforschung (in English), 1970, vol. 22, pp. 158–77.
B. Lux:Giessereiforschung (in English), 1970, vol. 22, pp. 65–81.
S. Bannerjee:Brit. Foundryman, 1965, vol. 58, pp. 344–53.
H. Morrogh:Trans. Amer. Foundrymen's Soc., 1948, vol. 56, pp. 72–90.
H. D. Merchant:Recent Research on Cast Iron, H. D. Merchant, ed., Gordon and Breach, pp. 33–40, New York, N.Y., 1968.
F. H. Buttner, H. F. Taylor, and John Wulff:Amer. Foundryman, 1951, vol. 20, pp. 49–50.
I. Minkoff and B. Lux:AFS Cast Metals Res. J., 1970, vol. 6, pp. 181–83.
J. C. Sawyer and J. F. Wallace:AFS Cast Metals Res. J., 1969, vol. 5, pp. 83–87.
R. H. McSwain, C. E. Bates, and W. D. Scott:AFS Cast Metals Res. J., 1974, vol. 10, pp. 181–90.
H. M. Weld, R. L. Cunningham, and F. W. C. Boswell,J. Metals, 1952, vol. 4, pp. 738–42.
W. A. Spindler and R. A. Flinn:Trans. Amer. Foundrymen's Soc., 1962, vol. 70, pp. 1017–28.
G. T. Van Rooyen and G. Paul:Metal Sci., 1974, vol. 8, pp. 370–82.
G. N. J. Gilbert and M. G. Day:BCIRA J., 1969, vol. 17, pp. 548–59.
H. B. Smartt, B. V. Kovacs, and G. S. Cole: Unpublished research, 1974.
W. C. Johnson and D. F. Stein:Met. Trans. 1974, vol. 5, pp. 549–54.
D. F. Stein, W. C. Johnson, and C. L. White:Can. Met. Quart. 1974, vol. 13, pp. 79–90.
A. Joshi and D. F. Stein:Met. Trans., 1970, vol. 1, pp. 2543–46.
W. C. Johnson, B. V. Kovacs, and J. A. Clum:Scr. Met., 1974, vol. 8, pp. 1309–15.
W. C. Johnson and H. B. Smartt:Scr. Met., 1975, vol. 9, pp. 1205–10.
C. C. Chang:Surface Sci., 1971, vol.25, pp. 53–79.
W. C. Johnson, D. F. Stein, and A. Joshi:Can. J. Spectrosc., 1972, vol. 17, pp. 88–92.
G. K. Wehner and D. J. Hajicek:J. Appl. Phys., 1971, vol. 42, pp. 1145–49.
G. K. WehnerMethods and Phenomena I—Methods of Surface Analysis, A. W. Czandrna, ed., pp. 6–37, Elsivier Sci. Publ. Co., New York, N.Y., 1975.
R. E. Nielsen and W. B. Shepherd:Rev. Sci. Instrum., 1964, vol. 35, pp. 123–24.
D. A. Vermilyea:Acta Met., 1953, vol. 1, pp. 282–92.
P. W. Palmberg, G. E. Riach, R. E. Weber, and N. C. McDonald:Handbook of Auger Electron Spectroscopy, Physical Electronics Industries, Inc. Eden Prairie, Minn., 1972.
N. C. McDonald: Private communication, 1976.
C. D. Wagner:Anal. Chem., 1975, vol. 47, pp. 1201–03.
L. A. Neumeier, B. A. Betts, and D. H. Desy:AFS Trans., 1974, vol. 82, pp. 131–38.
I. Minkoff and W. C. Nixon:J. Appl. Phys., 1966, vol. 37, pp. 4848–55.
von Peter Warbichler and W. Geymayer:Giessereiforschung, 1973, vol. 25, pp. 29–38.
P. M. Thomas and J. E. GruzleskiJ. Iron Steel Inst., 1973, vol. 211, pp. 426–28.
M. Honma and A. Minato:Imono, J. Japan Foundryman's Soc., 1959, vol. 31, pp. 1064–72.
J. P. Sadocha and J. E. Gruzleski:The Metallurgy of Cast Iron, B. Lux, I. Minkoff, and F. Mollard, eds., pp. 443–59, Georgi Publ. Co., St. Saphorin, Switzerland, 1975.
G. Koves and L. F. Mondolfo:J. Iron Steel Inst., 1964, vol. 202, pp. 424–26.
H. B. Smartt and W. C. Johnson: Unpublished research, 1976.
H. D. Keith and F. J. Padden, Jr.:J. Appl. Phys., 1964, vol. 35, pp. 1270–85.
H. D. Keith and F. J. Padden, Jr.:J. Appl. Phys., 1964, vol. 35, pp. 1286–96.
H. D. Keith and F. J. Padden, Jr.:J. Appl. Phys., 1963, vol. 34, pp. 2409–21.
C. B. Kim and R. W. Heine:J. Inst. Metals, 1963–64, vol. 92, pp. 367–76.
V. de L. Davies and J. M. West:J. Inst. Metals, 1963–64, vol. 92, pp. 175–80.
A. A. Chernov:Sov. Phys. Crystallogr., 1972, vol. 16, pp. 734–53.
W. W. Mullins and R. F. Sekerka:J. Appl. Phys., 1963, vol. 34, pp. 323–29.
R. Hultgren, P. D. Desai, D. T. Hawkins, M. Gleiser, and K. K. Kelley:Selected Values of the Thermodynamic Properties of Binary Alloys, p. 485, ASM, Metals Park, Ohio, 1973.
A. R. Ubbelohde and F. A. Lewis:Graphite and its Crystal Compounds, p. 58, Clarendon Press, Oxford, 1960.
A. Goldsmith, T. E. Waterman, and H. J. Hirschhorn:Handbook of Thermophysical Properties of Solid Materials-Revised Edition-Volume I: Elements, pp. 105, 115–21. The Macmillan Co., New York, N.Y., 1961.
Ibid., pp. 105.
A. Goldsmith, T. E. Waterman, and H. J. Hirschhorn:Handbook of Thermophysical Properties of Solid Materials-Rivised Edition-Volume II: Alloys, pp. 64–68, The Macmillan Co., New York, N.Y., 1961.
Y. S. Touloukian, P. W. Powell, C. Y. Ho, and P. G. Klemens:Thermal Conductivity-Metallic Elements and Alloys, pp. 169, 1128–41, Plenum Press, New York, N.Y., 1970.
C. Roscoe, D. Nagle, and S. B. Austerman:J. Mater. Sci., 1971, vol. 6, pp. 998–1006.
F. C. Frank:Discuss. Faraday Soc., 1949, vol. 5, pp. 48–54.
A. A. Chernov:Sov. Phys. Usp., 1961, vol. 4, pp. 116–48.
G. Bliznakov:Z. Phys. Chem. Leipzig, 1958, vol. 209, pp. 372–75.
A. A. Chernov:Sov. Phys. Dokl., 1960, vol. 5, pp. 654–57.
A. A. Chernov:Sov. Phys. Dokl., 1960, vol. 5, pp. 470–73.
B. Lux:AFS Cast Metals Res. J., 1972, vol. 8, pp. 49–65.
B. Lux, I. Minkoff, F. Mollart, and E. Thury:The Metallurgy of Cast Iron, B. Lux, I. Minkoff, and F. Mollard, eds., pp. 475–508, Georgi Pub. Co., St. Saphorin, Switzerland, 1975.
A. Hellawell: Private communication, 1976.
M. J. Hunter and G. A. Chadwick:J. Iron Steel Inst., 1972, vol. 210, pp. 117–23.
M. J. Lalich:The Metallurgy of Cast Iron, B. Lux, I. Minkoff, and F. Mollard, eds., pp. 561–81. Georgi Pub. Co., St. Saphorin, Switzerland, 1975.
W. G. Wilson, D. A. R. Kay, and A. Vahed:J. Metals, 1974, vol. 26, pp. 14–23.
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Johnson, W.C., Smartt, H.B. The role of interphase boundary adsorption in the formation of spheroidal graphite in cast iron. Metall Trans A 8, 553–565 (1977). https://doi.org/10.1007/BF02676976
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DOI: https://doi.org/10.1007/BF02676976