Abstract
The high-temperature oxidation behavior of a nickel-base superalloy andaluminide-diffusion coating has been investigated over the temperaturerange from 800–1100°C and analyzed by TGA, XRD, EDAX, andSEM. The β-NiAl coating was formed by low-pressure gas-phasecementation at 950°C for 3 hr. It was found that the formation ofα-Al2O3 from θ-Al2O3 on the β-NiAl coating resulted in asharp decrease in the parabolic rate constant kp by one order ofmagnitude at 1050°C during transient oxidation. The transformationcaused the anomalous behavior of the oxidation kinetics curves of thisdiffusion coating in the temperature range 800–1100°C withinthe first 100 hr. A change in the morphology of scales also occurredwith the transformation. A growth stress was characterized by theformation of convoluted scales, which were observed on the surfaceafter oxidation. The oxidation mechanism of this β-NiAl diffusioncoating is described.
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REFERENCES
J. D. Kuenzly and D. L. Douglass, Oxid. Met. 8, 139 (1974).
R. Sivakumar, N. B. Menon, and L. L. Seigle, Metall. Trans. A4, 397 (1973).
G. W. Goward and D. H. Boone, Oxid. Met. 3, 475 (1971).
R. Sivakumar and B. L. McMordie, Surface Coat. Technol. 37, 160 (1989).
F. S. Pettit, Trans. TMS-AIME 239, 1296 (1967).
R. Hutchings and M. H. Loretto, Mater. Sci. Technol. 12, 503 (1978).
J. L. Smialek, Metall. Trans. A9, 309 (1978).
P. T. Moseley, K. R. Hyde, B. A. Bellany, and G. Tappin, Corros. Sci. 24, 547 (1984).
J. Doychak and M. Ruhle, Oxid. Met. 32, 431 (1989).
G. C. Rybicki and J. L. Smialek, Oxid. Met. 31, 275 (1989).
J. Doychak, J. L. Smialek, and T. E. Mitchell, Metall. Trans. A20, 499 (1989).
G. C. Wood and B. Chattopadhay, Corros. Sci. 10, 471 (1970).
G. C. Wood and B. Chattopadhay, Oxid. Met. 2, 373 (1970).
W. C. Hagel, Corrosion 21, 316 (1965).
J. L. Smialek and R. Gibala, Metall. Trans. A10, 2143 (1983).
J. Peters and H. J. Grabke, Werbst. Korros. 35, 385 (1984).
M. W. Brumm and H. J. Grabke, Corros. Sci. 33, 1677 (1992).
M. W. Brumm and H. J. Grabke, Corros. Sci. 34, 547 (1993).
M. W. Brumm, H. J. Grabke, and B. Wagemann, Corros. Sci. 36, 37 (1994).
H. J. Grabke and G. H. Meier, Oxid. Met. 44, 147 (1995).
H. J. Grabke, D. Wiemer, and H. Viefhaus, Appl. Surface Sci. 47, 243 (1997).
H. J. Grabke, W. M. Brumm, and B. Wagemann, Mater. Corros. 47, 675 (1996).
S. J. Grisaffe, in The Superalloys, C. T. Sims and W. C. Hagel, Eds. (Wiley, New York, 1972), p. 356.
M. F. Singleton, J. L. Murray, and P. Nash, in Binary Alloy Phase Diagram, Vol. 1, T. B. Massalski, ed. (American Society Metals, Metals Park, Ohio, 1986), p. 140.
H. Fang, Acta Met. Sinica 11, 89 (1975) (in Chinese).
23. S. J. Grisaffe, in The Superalloys, C. T. Sims and W. C. Hagel, eds. (Wiley, New York, 1972), p. 356.
L. Vandenbulcke, G. Leprince, and B. Nciri, Mater. Sci. Eng. A121, 579 (1989).
G. W. Goward, J. Met. 22, 31 (1970).
B. Pieraggi, Oxid. Met. 27, 177 (1987).
B. A. Pint, M. Treska, and L. W. Hobbs, Oxid. Met. 47, 1 (1997).
F. A. Golightly, F. H. Stott, and G. C. Wood, J. Electrochem. Soc. 126, 1035 (1979).
F. A. Golightly, G. C. Wood, and F. H. Stott, Oxid. Met. 14, 217 (1980).
S. C. Choi, H. J. Cho, Y. J. Kim, and D. B. Lee, Oxid. Met. 46, 52 (1996).
C. H. M. Marie, E. Schramm, and J. H. de Wit, Corrosion 47, 119 (1996).
J. Jedlinski and S. Mrowec, Mater. Sci. Eng. A87, 281 (1987).
E. W. A. Young, and J. H. de Wit, Oxid. Met. 26, 351 (1986).
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An, T.F., Guan, H.R., Sun, X.F. et al. Effect of the θ–α-Al2O3 Transformation in Scales on the Oxidation Behavior of a Nickel-Base Superalloy with an Aluminide Diffusion Coating. Oxidation of Metals 54, 301–316 (2000). https://doi.org/10.1023/A:1004654429687
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DOI: https://doi.org/10.1023/A:1004654429687