Abstract
This paper documents the effect of stress and temperature on the cyclic minimum strain rate at two different loading frequencies for the oxide dispersion strengthened (ODS) superalloy, INCONEL* MA 6000. The apparent stress exponent and activation energy for cyclic creep at both frequencies studied are shown to be greater than values observed for static creep. The large values of the stress exponent and activation energy for cyclic creep are proposed to result from anelastic strain storage delaying nonrecoverable creep during the on-load portion of the cyclic creep loading, such that the “effective stress” driving nonrecoverable creep is only a small fraction of the applied stress. In addition, the temperature dependence of the anelastic relaxation that occurs during the off-load portion of the cyclic creep loading is determined. The activation energy found for the relaxation process is equal to about one-half that for self-diffusion in nickel. A mechanism of localized climb of dislocations over the oxide dispersoids present in INCONEL MA 6000 is postulated to account for the observed activation energy of the relaxation process.
Similar content being viewed by others
References
V.C. Nardone, D.E. Matejczyk, and J.K. Tien:Metall. Trans. A, 1983, vol. 14A, p. 1435.
D. E. Matejczyk, Y. Zhuang, and J. K. Tien:Metall. Trans. A, 1983, vol. 14A, p. 241.
Y. G. Kim and H. F. Merrick: NASA CR-159493, May 1979.
T. E. Howson, D. A. Mervyn, and J. K. Tien:Metall. Trans. A, 1980, vol. 11A, p. 1609.
V.C. Nardone, D.E. Matejczyk, and J.K. Tien:Metall. Trans. A, 1985, vol. 16A, p. 1117.
A. S. Nowick and B.S. Berry:Anelastic Relaxation in Crystalline Solids, Academic Press, New York, NY, 1972.
R. W. Lund and W. D. Nix:Acta Metall., 1976, vol. 24, p. 469.
V. Lupine and F. Gabrielli:Mat. Sci. Eng., 1979, vol. 37, p. 143.
P.W. Davies, G. Nelmes, K.R. Williams, and B. Wilshire:Met. Sci. J., 1973, vol. 7, p. 187.
K.R. Williams and B. Wilshire:Met. Sci. J., 1973, vol. 7, p. 176.
J. D. Parker and B. Wilshire:Met. Sci. J., 1975, vol. 9, p. 248.
S. Purushothaman and J.K. Tien:Acta Metall., 1978, vol. 26, p. 519.
O. Ajaja, T. E. Howson, S. Purushothaman, and J. K. Tien:Mat. Sci. Eng., 1980, vol. 44, p. 165.
R. R. Jensen: Eng. Sci. D. Thesis, Columbia University, New York, NY, 1984.
V. C. Nardone and J. K. Tien:Scripta Metall., 1983, vol. 17, p. 467.
V. C. Nardone, D. E. Matejczyk, and J. K. Tien:Acta Metall., 1984, vol. 32, p. 1509.
A.H. Cooper, V.C. Nardone, and J.K. Tien: inFifth International Conference on Superalloys, 1984, TMS-AIME Press, Warrendale, PA, p. 359.
L. M. Brown and R. K. Ham: inStrengthening Methods in Crystals, A. Kelly and R.B. Nicholson, eds., Halsted Press, 1972, p. 10.
W. M. Stobbs:Phil. Mag., 1973, vol. 25, p. 1073.
D. E. Matejczyk: Eng. Sci. D. Thesis, Columbia University, New York, NY, 1983.
Author information
Authors and Affiliations
Additional information
VINCENT C. NARDONE, formerly Associate Research Scientist, Henry Krumb School of Mines, Columbia University
Rights and permissions
About this article
Cite this article
Nardone, V.C., Kimmerle, W.L. & Tien, J.K. Cyclic creep and anelastic relaxation analysis of an ODS superalloy. Metall Trans A 17, 1577–1583 (1986). https://doi.org/10.1007/BF02650094
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02650094