Abstract
Specimens of pure Fe and of Fe-0.8 mass % C, Fe-0.5 mass % Cr, Fe-4.0 mass % Cr, Fe-4.0 mass% Ni, and Fe-10.0 mass% Ni alloys were borided in boriding powder. A boron-compound layer developed consisting of a surface-adjacent “FeB” sublayer on top of an “Fe2B” sublayer. Layer-growth kinetics were analyzed by measuring the extent of penetration of the “FeB” and “Fe2B” sublayers as a function of boriding time and temperature in the range 1025–1275 K. Layer growth is dominated by B diffusion through “FeB/Fe2B”. This diffusion process is of strongly anisotropic nature. Consequently, ragged interfaces occur between the substrate and the boride layers. The depths of the tips of the most deeply penetrated “FeB” and “Fe2B” needles have been taken as measures for diffusion in the easy [001] diffusion directions. Assuming unidirectional B diffusion and parabolic growth, a simple model of layer growth has been given. It accounts for the specific volume difference between “FeB” and “Fe2B”. In contrast with earlier work, the model provides values for the kinetic parameters for growth of each of the phases in the boron-compound layer.
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References
A. Graf von Matuschka, Boronising (Carl Hanser Verlag, Munich, FRG, 1980).
P. A. Dearnley and T. Bell, Surf. Eng. 1, 203–217 (1985).
H. Kunst and O. Schaaber, Härterei-Tech. Mitt. 22, 1–25 (1967).
M-J. Lu, Härterei-Tech. Mitt. 38, 156–169 (1983).
O. Kubaschewski, Iron-Binary Phase Diagrams (Springer Verlag, Berlin, FRG, 1982).
Binary Phase Diagrams, edited by T. B. Massalski et al. (ASM, Metals Park, OH, 1986), Vol. 1, p. 356.
T. Bjurström and H. Arnfelt, Z. Phys. Chem. (B) 4, 469–474 (1929).
B. Hendricks and P. R. Kosting, Z. Kristallog. 74, 511–545 (1930).
T. Bjurström, Ark. Kemi, Mineralogi och Geologi 11A, no. 5, 1–12 (1933).
R. Kiessling, Acta Chem. Scand. 4, 209–227 (1950).
W. B. Pearson, Handbook of Lattice Spacings and Structures of Metals (Pergamon Press, Oxford, 1967), Vol. 1, p. 899.
W. B. Pearson, Handbook of Lattice Spacings and Structures of Metals (Pergamon Press, Oxford, 1985), Vol. 2, p. 1297.
E. E. Havinga, H. Damsma, and P. Hokkeling, J. Less-Common Metals 27, 169–193 (1972).
B. Aronsson, T. Lundström, and I. Engström, Proc. Int. Symp. on Anisotropy in Single-Crystal Refractory Compounds, edited by F. W. Vahldiek and S.A. Mersol, 1967 (Plenum Press, New York, 1968), Vol. 1, pp. 3–22.
International Tables for X-ray Crystallography (The Kynoch Press, Birmingham, 1962), Vol. 3, p. 42.
M. Chochołowski, K. Przybyłowicz, J. Szymański, and J. Żelechowski, Metalurgia i Odlewnictwo 9, 411–421 (1983).
J. J. Smit, M.Sc. Thesis, Delft University of Technology, Laboratory of Metallurgy, 1984.
G. Hägg, Z. Phys. Chem. (B) 11, 152–162 (1930).
L. Pauling, The Nature of the Chemical Bond, 3rd ed. (Cornell University Press, New York, 1960), p. 435.
W. B. Pearson, The Crystal Chemistry and Physics of Metals and Alloys (Wiley, New York, 1972), p. 135.
H. Plänitz, G. Treffer, H. König, and G. Marx, Neue Hütte 27, 228–230 (1982).
C. Badini, C. Gianoglio, and G. Pradelli, J. Mater. Sci. 21, 1721–1729 (1986).
Z-S. Jiang, L-X. Zhang, L-G. Li, X-R. Pei, and T-F. Li, J. Heat Treating 2, 337–343 (1982).
J. Fridberg, L-E. Törndahl, and M. Hillert, Jernkont. Ann. 153, 264–276 (1969).
W. H. Press, B. P. Flannery, S. A. Teukolsky, and W. T. Vetterling, Numerical Recipes (Cambridge University Press, Cambridge, 1986), pp. 269–272.
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Brakman, C.M., Gommers, A.W.J. & Mittemeijer, E.J. Boriding of Fe and Fe–C, Fe–Cr, and Fe–Ni alloys; Boride-layer growth kinetics. Journal of Materials Research 4, 1354–1370 (1989). https://doi.org/10.1557/JMR.1989.1354
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DOI: https://doi.org/10.1557/JMR.1989.1354