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The microstructural evolution of the Ni-based superalloy CMSX-4 including the change in gamma prime morphology, size, and distribution after high-temperature degradation and subsequent rejuvenation heat treatments has been examined using field emission gun scanning electron microscopy and transmission electron microscopy. In this paper, it is shown that there are significant differences in the size of the ‘channels’ between gamma prime particles, the degree of rafting, and the size of tertiary gamma prime particles in each of the different microstructural conditions studied. Chemical analysis has been carried out to compare rejuvenated and pre-service samples after the same subsequent degradation procedure. The results indicate that although the microstructures of pre-service and rejuvenated samples are similar, chemical differences are more pronounced in the rejuvenated samples, suggesting that chemical segregation from partitioning of the elements was not completely eliminated through the applied rejuvenation heat treatment. A number of modified rejuvenation heat treatment trials were carried out to reduce the chemical segregation prior to creep testing. The creep test results suggest that chemical segregation has an immeasurable influence on the short-term mechanical properties under the test conditions used here, indicating that further work is required to fully understand the suitability of specific rejuvenation heat treatments and their role in the extension of component life in power plant applications.
R. C. Reed: The superalloys: fundamentals and applications, Cambridge University Press, London, 2006. CrossRef
T. M. Pollock, N. Rene, and S. Tin: J. Propul. Power, 2006, vol. 22, no. 2, pp. 361–374. CrossRef
M. Nazmy, A. Epishin, T. Link, and M. Staubli: Energy Mater., 2006, vol. 1, no. 4, pp. 263–268. CrossRef
E. Lvova and D. Norsworthy: J. Mater. Eng. Perform., 2001, vol. 10, pp. 299–312. CrossRef
A. Epishin, T. Link, U. Brückner, B. Fedelich, and P. Portella: Superalloys, 2004, pp. 537–43.
C. M. F. Rae and R. C. Reed: Acta Mater., 2001, vol. 49, no. 19, pp. 4113–4125. CrossRef
A. Epishin, T. Link, M. Nazmy, M. Staubli, and G. Nolze: in Proceedings of Superalloys 2008, R. C. Reed et al., eds. 2008, pp. 725–731.
A. James: Mater. Sci. Technol., 2001, vol. 17, no. 5, pp. 481–486. CrossRef
A. Baldan: J. Mater. Sci., 1991, vol. 26, no. 13, pp. 3409–3421. CrossRef
R. C. Reed, D. C. Cox, and C. M. F. Rae: Mater. Sci. Technol., 2007, vol. 23, no. 8, pp. 893–902. CrossRef
M. Kamaraj, K. Serin, M. Kolbe, and G. Eggeler: Mater. Sci. Eng., A, 2001, vol. 319, pp. 796–799. CrossRef
R. A. MacKay and M. V. Nathal: Acta Metall. Mater., 1990, vol. 38, no. 6, pp. 993-1005. CrossRef
M. V. Nathal and L. J. Ebert: Scripta Metall., 1983, vol. 17, pp. 1151-1154. CrossRef
T. Murakumo, Y. Koizumi, K. kobayashi and H. Harada: Superalloys 2004, K. A. Green, T. M. Pollock, H. Harada, T. E. howson, R. C. reed, J. J. Scirra and S. Walston, eds., pp. 115–62.
R. A. MacKay and L. J. Ebert: Met, Trans. A, 1985, vol. 16A, pp. 1969-1982. CrossRef
K. Y. Cheng, C. Y. Jo, D. H. Kim, T. Jin, and Z. Q. Hu: Mater. Charact., 2009, vol. 60, no. 3, pp. 210–218. CrossRef
T. Niki, K. Ogawa, and T. Shoji: Key Eng. Mater., 2007, vol. 353–358, pp. 537–540. CrossRef
C. T. Sims, N. S. Stoloff, and W. C. Hagel, Superalloys II. New York: Wiley-Interscience, 1987.
G. E. Fuchs: Mater. Sci. Eng., A, 2001, vol. 300, pp. 52–60. CrossRef
M. S. A. Karunaratne, C. M. F. Rae, and R. C. Reed: Metall. Mater. Trans. A, 2001, vol. 32, no. 10, pp. 2409–2421. CrossRef
J. Svoboda and P. Lukas: Acta Mater., 1998, vol. 10, pp. 3421-3431. CrossRef
Z. Yao, C. C. Degnan, M. A. E. Jepson, and R. C. Thomson: Mater. Sci. Technol., 2013, vol. 29, no. 7, pp. 775–780. CrossRef
M. Ignat, J.-Y. Buffiere, and J. M. Chaix: Acta Metall. Mater., 1993, vol. 41, no. 3, pp. 855–862. CrossRef
ASTM: E139 standard test methods for conducting creep, creep-rupture, and stress-rupture tests of metallic materials 1. Annu. B. ASTM Stand. 4, pp. 1–14, 2014.
T. M. Pollock and A. S. Argon: Acta Metall. Mater., 1992, vol. 40, no. 1, pp. 1–30. CrossRef
R. Jensen and J. Tien: Metall. Trans. A, 1985, no. 6, vol. 16, pp. 1049–1068. CrossRef
M. Durand-Charre: The microstructure of superalloys, CRC Press, Paris 1998.
- Microstructural and Chemical Rejuvenation of a Ni-Based Superalloy
Craig C. Degnan
Mark A. E. Jepson
Rachel C. Thomson
- Springer US
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