Abstract
Martensitic nucleation under normal circumstances is a heterogeneous process, and the heterogeneity can be explained by the potency distribution of defects that provide the nucleation sites, including both preexisting and autocatalytically generated defects. The potency distribu- tion of the preexisting defects has been shown earlier by small-particle studies to follow an exponential function, whereas that of the autocatalytic defects is found in the present work to obey a Gaussian function. A major distinction between these two distributions is that the number density of thepreexisting defects increases monotonically with decreasing defect potency, while the number density of theautocatalytic defects is distributed about a mode, giving a saturation level of its cumulative distribution. As a result of these potency distributions, the nucleating sites of both origins exhibit distributions in their activation energies for nucleation, and a distributed- activation kinetic model is now proposed to take these variations into account for martensitic transformations. The features of this model are tested with considerable success in experiments on an Fe-32.3Ni alloy, leading to calculations of the entire course of martensitic transformation curves (including the athermal, anisothermal, and isothermal contributions), the changing shapes of time-temperature-transformation (TTT) diagrams for a range of Fe-Ni compositions, and the grain-size dependence of “bursting” behavior.
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R.M. Kimmel and D.R. Uhlmann:J. Appl. Phys., 1969, vol. 40, pp. 4254–60.
A.S. Argon and H.Y. Kuo:J. Non-Crystalline Solids, 1980, vol. 37, pp. 241–66.
ES. Machlin and Morris Cohen:Trans. AIME, 1952, vol. 194, pp. 489–500.
C L. Magee:Metall. Trans., 1971, vol. 2, pp. 2419–30.
V. Raghavan and Morris Cohen:Metall Trans., 1971, vol. 2, pp. 2409–18.
V. Raghavan: inMartensite, G.B. Olson and W.S. Owen, eds., ASM, Metals Park, OH, 1992.
R.E. Cech and D. Turnbull:Trans. AIME, 1956, vol. 206, pp. 124–32.
G.B. Olson and Morris Cohen:New Aspects of Martensitic Transformation, Japan Institute of Metals, Kobe, Japan, 1977, pp. 93–98.
I.-Wei Chen, Y.-H. Chiao, and K. Tsuzaki:acta Metall., 1985, vol. 33, pp. 1847–59.
S. Kajiwara, S. Ohno, K. Honma, and M. Uda:Proc. ICOMAT 86, Japan Institute of Metals, Nara, Japan, 1986, pp. 359–64.
S. Kajiwara, S. Ohno, and K. Honma:Phil. Mag. A, 1991, vol. 63, pp. 625–44.
T.F. Kelly, M. Cohen, and J.B. Vander Sande:Metall. Trans. A, 1984, vol. 15A, pp. 819–33.
G.B. Olson, K. Tsuzaki, and Morris Cohen:David Turnbull Symp. on Phase Transitions in Condensed Systems, G.S. Cargill, F. Spaepen, and K.N. Tu, eds., MRS, Pittsburgh, PA, 1987, vol. 57, pp. 127–48.
G.B. Olson and Morris Cohen:Metall. Trans. A, 1976, vol. 7A, pp. 1915–23.
G.B. Olson and Morris Cohen:Ann. Rev. Mater. Sci., 1981, vol. 11, pp. 1–30.
R.L. Fullman:Trans. AIME, 1953, vol. 197, pp. 447–52.
D.G. McMurtrie and C.L. Magee:Metall. Trans., 1970, vol. 1, pp. 3185–91.
G.B. Olson and Morris Cohen:Metall. Trans. A, 1976, vol. 7A, pp. 1897–1904.
G.B. Olson and Morris Cohen: inDislocations in Solids, Vol. 7, F.R.N. Nabarro, ed., North-Holland, Amsterdam, 1986, pp. 295–407.
G. Hausch and H. Warlimont:acta Metall., 1973, vol. 21, pp. 401–14.
D.M. Haezebrouck: Sc.D. Thesis, Massachusetts Institute of Technology, Cambridge, MA, 1987.
M. Grujicic, H.C. Ling, D.M. Haezebrouck, and W.S. Owen: inMartensite, G.B. Olson and W.S. Owen, eds., ASM, Metals Park, OH, 1992.
L. Kaufman: Manlabs-NPL Thermochemical Database, 1977.
K. Uakko, M. Nieminen, and J. Pietikainen:Martensitic Transformations, Proc. ICOMAT 89, Sydney, Australia, B.C. Muddle, ed.,Materials Science Forum Vols. 56-58, Trans Tech Publications, Aedermannsdorf, Switzerland, 1990, pp. 225–28.
K. Tsuzaki, T. Fukiage, T. Maki, and I. Tamura:Martensitic Transformations, Proc. ICOMAT 89, Sydney, Australia, B.C. Muddle, ed.,Materials Science Forum Vols. 56–58, Trans Tech Publications, Aedermannsdorf, Switzerland, 1990, pp. 229–34.
K. Tsuzaki and T. Maki:J. Japan Inst. Met., 1981, vol. 45, pp. 126–34.
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Formerly Graduate Student, Massachusetts Institute of Technology, is Research Engineer, Bethlehem Steel Corporation, Bethlehem, PA 18016.
Formerly Senior Research Associate, Massachusetts Institute of Technology
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Lin, M., Olson, G.B. & Cohen, M. Distributed-activation kinetics of Heterogeneous Martensitic Nucleation. Metall Trans A 23, 2987–2998 (1992). https://doi.org/10.1007/BF02646117
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DOI: https://doi.org/10.1007/BF02646117