On γ-γ’ Eutectic Quantitative Evaluation in the as-Cast CMSX-4 Nickel-Based Superalloy

Abstract:

The aim of the work is estimation of usefulness of several selected etchants and image acquisition methods for revealing of microstructure of CMSX-4 nickel–based superalloy from computer-aided quantitative metallography’s point of view. The analysis was carried out on images registered using light and scanning electron microscopes. The images of the microstructure have been analyzed in γ γ’ eutectic’s investigations context, especially to estimate the eutectic quantitatively. The work contains description of experimental method for quantitative evaluation of γ γ’ eutectic present in as-cast state of the superalloy. A quantitative evaluation of γ γ’ eutectic islands in CMSX 4 superalloy is indispensable for a proper evaluation of γ’ phase precipitates. It is mainly related to coarse cellular γ’ phase precipitates present in γ γ’ eutectic islands.

• Periodical: Solid State Phenomena (Volume 197)
• Pages: 203-208
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.197.203
• Online since: February 2013
• Authors: Agnieszka Szczotok
• Keywords: CMSX-4 Superalloy, Image Analysis, Quantitative Evaluation, γ-γ’ Eutectic

References

[1] M.J. Donachie, S.J. Donachie, Superalloys, second ed., ASM, Materials Park, Ohio, USA, 2002.

[2] M. Durand-Charre, The Microstructure of Superalloys. Gordon and Breach Science Publishers, Amsterdam, 1997.

[3] W.S. Walston, I.M. Bernstein, A.W. Thompson, The role of the γ/γ' eutectic and porosity on the tensile behavior of a single-crystal nickel-base superalloy, Metall. Mater. Trans. A 22A (1991) 1445-1455.

DOI: 10.1007/bf02660676

[4] L. Wang, F. Pyczak, J. Zhang, L.H. Lou, R.F. Singer, Effect of eutectics on plastic deformation and subsequent recrystallization in the single crystal nickel base superalloy CMSX-4, Mat. Sci. Eng. A 532 (2012) 487-492.

DOI: 10.1016/j.msea.2011.11.015

[5] S.M. Seo, J.H. Lee, Y.S. Yoo, C.Y. Jo, H. Miyahara, K. Ogi, A Comparative Study of the γ/γ' eutectic evolution during the solidification of Ni-base superalloys, Metall. Mater. Trans. A vol. 42A, (2011) 3150-3159.

DOI: 10.1007/s11661-011-0738-4

[6] K. Hilpert, D. Kobertz, V. Venugopal, M., Miller, H. Gerads, F.J. Bremer, H. Nickel, Phase Diagram Studies on the Al-Ni System, Verlag der Zeitschrift für Naturforschung 42A (1987) 1327-1331.

DOI: 10.1515/zna-1987-1117

[7] J. H. Lee, J.D. Verhoeven, Eutectic formation in the Ni-Al system, J. Cryst. Growth 143 (1994) 86-102.

[8] J. H. Lee, J.D. Verhoeven, Peritectic formation in the Ni-Al system, J. Cryst. Growth 144 (1994) 353-366.

DOI: 10.1016/0022-0248(94)90477-4

[9] A. Szczotok, J. Richter, J. Cwajna, Stereological characterization of g' phase precipitation in CMSX-6 monocrystalline nickel-base superalloy, Mater. Charact. 60 (2009) 1114-1119.

DOI: 10.1016/j.matchar.2009.01.023

[10] A. Szczotok, Quantitative evaluation of carbides in nickel-base superalloy MAR-M247, IOP Conf. Series: Mat. Sci. Eng. 22 (2011) 012007.

DOI: 10.1088/1757-899x/22/1/012007

[11] J. Szala, Application of Computer-Aided Image Analysis Methods for a Quantitative Evaluation of Material Structure, Silesian University of Technology, Gliwice, Poland, 2001 (in Polish).