Abstract
The creep and rupture behavior of [001] oriented single crystals of the nickel-base superalloy NASAIR 100 was investigated at temperatures of 925 and 1000 °C. In the stress and temperature ranges studied, the steady state creep rate, time to failure, time to the onset of secondary creep, and the time to the onset of tertiary creep all exhibited power law dependencies on the applied stress. The creep rate exponents for this alloy were between seven and eight, and the modulus-corrected activation energy for creep was approximately 350 kjoule/mole, which was comparable to the measured activa-tion energy for Ostwald ripening of the γ′ precipitates. Oriented γ′ coarsening to form lamellae perpendicular to the applied stress was very prominent during creep. At 1000 °C, the formation of a continuous γ-γ′ lamellar structure was completed during the primary creep stage. Shear through the γ-γ ' interface is considered to be the rate limiting step in the deformation process. Gradual thickening of the lamellae appeared to be the cause of the onset of tertiary creep. At 925 °C, the fully developed lamellar structure was not achieved until the secondary or tertiary creep stages. At this temperature, the γ-γ′ lamellar structure did not appear to be as beneficial for creep resistance as at the higher temperature.
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C.C. Law and M.J. Blackburn:Metall. Trans. A, 1980, vol. 11A, p. 495.
J.P. Dennison, P.D. Holmes, B. Wilshire:Mat. Sci. Eng., 1978, vol. 33, p. 35.
H. Burt, J. P. Dennison, I. C. Elliott, and B. Wilshire:Mat. Sci. Eng., 1982, vol. 53, p. 245.
R. A. Stevens and P. E. J. Flewitt:Mat. Sci. Eng., 1979, vol. 37, p. 237.
G.A. Webster and B.J. Piearcey:Metal Sci. J., 1967, vol. 1, p. 97.
G.R. Leverant and B.H. Kear:Metall. Trans. A, 1970, vol. 1, p. 491.
G.R. Leverant, B.H. Kear, and J. M. Oblak:Metall. Trans., 1973, vol. 4, p. 355.
R. A. MacKay and R.D. Maier:Metall. Trans. A, 1982, vol. 13A, p. 1747.
C. Carry and J.L. Strudel:Acta Metall., 1978, vol. 26, p. 859.
D. D. Pearson, F. D. Lemkey, and B. H. Kear: inSuperalloys 1980, Proc. 4th Int. Symp. on Superalloys, J. K. Tien,et al., eds., ASM, Metals Park, OH, 1980, p. 513.
D.D. Pearson, B. H. Kear, and F. D. Lemkey: inCreep and Fracture of Engineering Materials and Structures, B. Wilshire and D.R. J. Owen, eds., Pineridge Press, Swansea, U.K., 1981, p. 213.
P. Caron and T. Kahn:Mat. Sci. Eng., 1983, vol. 61, p. 173.
R.A. MacKay and L.J. Ebert:Scripta Metall., 1983, vol. 17, p. 1217.
R.A. MacKay and L.J. Ebert: inSuperalloys 1984,Proc. 5th Int. Symp. on Superalloys, M. Gell, C. S. Kortovich, R. H. Bricknell, W. B. Kent, and J. F. Ractavich, eds., AIME, Warrendale, PA, 1984, p. 135.
T.E. Strangman, G.S. Hoppin, C.M. Phipps, K. Harris, and R.E. Schwer: inSuperalloys 1980, Proc. 4th Int. Symp. on Superalloys, J. K. Tien,et al., eds., ASM, Metals Park, OH, 1980, p. 215.
J.R. Stephens: NASA TM-83006, National Technical Information Services, Springfield, VA, 22161, 1982.
M.V. Nathal: Ph.D. Thesis, Case Western Reserve University, Cleveland, OH, January 1984.
M.J. Donachie and O. H. Kriege:J. Mat., 1972, vol. 7, p. 269.
T. E. Strangman, B. Heath, and M. Fujii: NASA CR-168218, National Technical Information Services, Springfield, VA, 22161, 1983.
F. C. Monkman and N. J. Grant:Proc. ASTM, 1956, vol. 56, p. 834.
A. K. Mukherjee, J.E. Bird, and J.E. Dorn:Trans. ASM, 1969, vol. 62, p. 155.
W. D. Nix and B. Ilschner:5th Int. Conf. Strength of Metals and Alloys, P. Haasen, V. Gerold, and G. Koster, eds., Pergamon Press, Oxford, 1979, vol. 3, p. 1503.
A. Lasalmonie and J.L. Strudel:Phil. Mag., 1975, vol. 32, p. 937.
G.C. Weatherly and R.B. Nicholson:Phil. Mag., 1968, vol. 17, p. 801.
D.A. Grose and G.S. Ansell:Metall. Trans. A, 1981, vol. 12A, p. 1631.
M. V. Nathal and L. J. Ebert:Scripta Metall., 1983, vol. 17, p. 1151.
J. Lin and O. D. Sherby:Res Mechanica, 1981, vol. 2, p. 251.
O. D. Sherby, R. H. Klundt, and A. K. Miller:Metall. Trans. A, 1977, vol. 8A, p. 843.
J.C. Gibeling and W. D. Nix:Met. Sci., 1977, vol. 11, p. 453.
J.D. Parker and B. Wilshire:Phil. Mag., 1980, vol. 41A, p. 665.
S. Takeuchi and A.S. Argon:J. Mat. Sci., 1976, vol. 11, p. 1542.
W.J. Evans and G. F. Harrison:Met. Sci., 1979, vol. 13, p. 346.
J. Askill:Tracer Diffusion Data for Metals, Alloys, and Simple Oxides, Plenum Publishing Corp., New York, NY, 1970.
E. H. VanDerMolen, J. M. Oblak, and O. H. Kriege:Metall. Trans., 1971, vol. 2, p. 1627.
A.J. Ardell and R.B. Nicholson:J. Phys. Chem. Solids, 1966, vol. 27, p. 1793.
J. W. Martin and R.D. Doherty:Stability of Microstructure in Metallic Systems, Cambridge Univ. Press, Cambridge, 1976, p. 154.
B. F. Dyson and M. McLean:Acta Metall., 1983, vol. 31, p. 17.
P. J. Henderson and M. McLean:Acta Metall., 1983, vol. 31, p. 1203.
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Nathal, M.V., Ebert, L.J. Elevated temperature creep-rupture behavior of the single crystal nickel-base superalloy NASAIR 100. Metall Trans A 16, 427–439 (1985). https://doi.org/10.1007/BF02814341
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DOI: https://doi.org/10.1007/BF02814341