Abstract
The kinetics of isothermal β-α′ martensitic transformation in the U−0.45 wt % Mo alloy has been investigated. The specimens were quenched from the β region (690° C) and held isothermally at temperatures from 120 to − 196° C (liquid nitrogen). By quantitative metallographic methods the percentage of the newly formedα′-phase was determined and the half-thicknessc and radiusr of plates calculated. The activation energy for nucleation period was estimated. It was found thatΔG depends linearly on temperature. The nucleation rateN was determined to be a parabolic function of temperature. A part of the T-T diagram below theM s temperature was determined.
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References
L. Kaufman andM. Cohen,Progr. Met. Phys. 7 (1958) 165.
R. E. Cech andJ. H. Hollomon,Trans. Amer. Inst. Min. Metall. Engrs. 197 (1953) 685.
A. R. Entwistle,Metal Sci. J. 2 (1968) 153.
J. W. Christian: “The Mechanism of Phase Transformations in Crystalline Solids”; Section IV: Martensitic Transformations (Inst. of Metals, London, 1969).
A. Mihajlović, A. Mance, S. Malčić, andP. Tepavac, Boris Kidrič Inst. Report IBK-633 (1968).
A. Mihajlović andA. Mance,J. Nuclear Materials 32 (1969) 357.
S. R. Pati, andM. Cohen,Acta Metallurgica 17 (1969) 189.
Op. cit. 3.
B. Djurić andA. Mihajlović, Boris Kidrič Inst. Report IBK-29 (1963).
J. Lehman, CEA (Saclay, France) Report CEA-1261 (1959).
Idem, “Nouveau Traité de Chimie Minerale” (Masson, Paris)15 (1967).
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Mihajlović, A. Activation energy of isothermal martensitic β-α′ transformation. J Mater Sci 5, 955–959 (1970). https://doi.org/10.1007/BF00558175
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DOI: https://doi.org/10.1007/BF00558175