Abstract
Individual powder particles of a droplet-processed and rapidly solidified 303 stainless steel are characterized in terms of microstructure and composition variations within the solidification structure using scanning transmission electron microscopy (STEM). Fcc is found to be the crystallization phase in powder particles larger than about 70 micron diameter, and bcc is the crystallization phase in the smaller powder particles. An important difference in partitioning behavior between these two crystal structures of this alloy is found in that solute elements are more completely trapped in the bcc structures. Massive solidification of bcc structures is found to produce supersaturated solid solutions which are retained to ambient temperatures in the smallest powder particles. Calculated liquid-to-crystal nucleation temperatures for fcc and bcc show a tendency for bcc nucleation at the large liquid supercoolings which are likely to occur in smaller droplets. The importance of small droplet sizes in rapid solidification processes is stressed.
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M. R. Glickstein, R. J. Patterson, II, and N. E. Shockey:Rapid Solidification Processing Principles and Technologies, R. Mehrabian, B. H. Kear, and M. Cohen, eds., Claitor’s Publishing Division, Baton Rouge, LA, 1978, pp. 46–63.
T. F. Kelly and J. B. Vander Sande:Rapid Solidification Processing Principles and Technologies, II, R. Mehrabian, B.K. Kear, and M. Cohen, eds., Claitor’s Publishing Division, Baton Rouge, LA, 1980, pp. 100–11.
Thomas F. Kelly: Ph.D. Thesis, Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, 1982, pp. 26–28.
R.D. Field and H.L. Fraser:Metall. Trans. A, 1978, vol. 9A, pp. 131–34.
R. A. Perkins:Metall. Trans., 1973, vol. 4, pp. 1665–69.
R. A. Perkins, R. A. Podgett, and N. K. Tunala:Metall. Trans., 1973, vol. 4, pp. 2535–40.
E. T. Turkdogan, S. Ignatowicz, and J. Pearson:J. Iron Steel Inst., 1955, vol. 180, p. 349.
C. E. Lyman and E. L. Hall:Microbeam Analysis, D. E. Newbury, ed., San Francisco Press, San Francisco, CA, 1979, pp. 135–38.
L. Kaufman and H. Bernstein:Computer Calculation of Phase Diagrams, Academic Press, New York, NY, 1970, pp. 36–45.
L. Kaufman: Manlabs, Inc., Cambridge, MA, private communication, 1981.
M. Hillert:Calculation of Phase Diagrams and Thermochemistry of Alloy Phases, Y. A. Chang and J.F. Smith, eds., The Metallurgical Society of AIME, Warrendale, PA, 1979, pp. 1–13.
F. Kohler:Mh. Chem., 1960, vol. 91, p. 738.
L. Kaufman:CALPHAD, 1977, vol. 1, pp. 7–89.
L. Kaufman and H. Nesor:CALPHAD, 1978, vol. 2, pp. 55–80.
L. Kaufman and H. Nesor:CALPHAD, 1978, vol. 2, pp. 81–108.
L. Kaufman:CALPHAD, 1978, vol. 2, pp. 117–46.
L. Kaufman and H. Nesor:CALPHAD, 1978, vol. 2, pp. 295–318.
L. Kaufman and H. Nesor:CALPHAD, 1978, vol. 2, pp. 325–48.
L. Kaufman:CALPHAD, 1979, vol. 3, pp. 45–76.
D. Mclssac: Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, measured on a differential thermal analyzer, private communication, 1982.
D. Turnbull:Contemp. Phys., 1969, vol. 10, pp. 473–88.
D. Turnbull:J. Chem. Phys., 1952, vol. 20, pp. 411–24.
F. Spaepen and D. Turnbull:Rapidly Quenched Metals II, N. J. Grant and B.C. Giessen, eds., MIT Press, Cambridge, MA, 1976, pp. 205–30.
F. Spaepen:Acta Metall., 1975, vol. 23, p. 729.
F. Spaepen and R.B. Meyer:Scr. Metall., 1976, vol. 10, p. 257.
C. V. Thompson: Ph.D. Thesis, School of Applied Sciences, Harvard University, Cambridge, MA, 1981.
N.J. Grant:Rapid Solidification Processing Principles and Technologies, R. Mehrabian, B.H. Kear, and M. Cohen, eds., Claitor’s Publishing Division, Baton Rouge, LA, 1978, pp. 230–45.
J. I. Goldstein:Introduction to Analytical Electron Microscopy, J. J. Hren, J. I. Goldstein, and D. C. Joy, eds., Plenum Press, New York, NY, 1979, pp. 83–120.
N.J. Zaluzec:Introduction to Analytical Electron Microscopy, J.J. Hren, J.I. Goldstein, and D.C. Joy, eds., Plenum Press, New York, NY, 1979, pp. 121–67.
G. Cliff and G. W. Lorimer:Proc. Fifth European Congress on Electron Microscopy, Institute of Physics, London, 1972, pp. 140–41.
K. F. J. Heinrich:The Electron Microprobe, T. O. McKinley, K. F. J. Heinrich, and D.B. Witt, eds., J. Wiley and Sons, New York, NY, 1966, pp. 296–377.
J. Philibert and R. Tixier:Br. J. Appl. Phys., 1968, vol. 1, p. 685.
J. I. Goldstein, J. L. Costly, G. W. Lorimer, and S. J. B. Reed:SEM, 1977, vol. 1, p. 315.
P. M. Kelly, A. Jostons, R. G. Blake, and J. G. Napier:Phys. Status Solidi A, 1975, vol. 31, pp. 771–80.
S. M. Allen:Philos. Mag. A, 1981, vol. 43, pp. 325–35.
J.P. Hirth:Metall. Trans. A, 1978, vol. 9A, pp. 401–04.
C. V. Thompson, A. L. Greer, and A. J. Drehman:Rapidly Quenched Metals IV, T. Masumoto, ed., The Japanese Institute of Metals, Sendai, Japan, 1981.
P. F. James:Phys. Chem. Glasses, 1974, vol. 15, no. 4, pp. 95–105.
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Formerly with Massachusetts Institute of Technology, Cambridge, MA.
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Kelly, T.F., Cohen, M. & vander Sande, J.B. Rapid solidification of a droplet-processed stainless steel. Metall Trans A 15, 819–833 (1984). https://doi.org/10.1007/BF02644556
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DOI: https://doi.org/10.1007/BF02644556