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Electrical Characterization of Aged Waspaloy Microstructures

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Abstract:

Non-destructive evaluation (NDE) techniques offer the potential advantage of achieving fast throughput microstructural characterization as well as monitoring that could be extremely valuable in assessing the mechanical integrity of turbine engine components. It is well known that the γ′ precipitate size and distribution can often determine the mechanical strength of nickel base alloys. In this investigation, Waspaloy, an age-hardening superalloy, was chosen as the candidate to produce varied microstructures, which were subsequently characterized via the DC four-probe resistivity method. Specimens with average grain sizes of 13, 52 and 89 μm were obtained upon solutionizing at 1045°C, 1090°C and 1145°C respectively. The specimens were annealed at 1045°C to stabilize the vacancy concentration prior to aging at 800°C for times ranging from 0.1 to 100 hours. Sub-grain microstructures examined in the SEM showed progressive growth of γ′ precipitates with increased aging duration in all cases. The measurements of DC four-probe resistivity showed a consistent drop in the resistivity with increased aging time, which was concurrent with the growth of the precipitates.

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Periodical:

Advanced Materials Research (Volumes 15-17)

Pages:

876-881

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.15-17.876

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Online since:

February 2006

Authors:

V.Siva Kumar, G. Kelekanjeri, Rosario A. Gerhardt

Keywords:

Aging Treatment, DC Four-Probe Resistivity, Waspaloy

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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References

[1] D.Q. Wang, S.S. Babu, E.A. Payzant, P.G. Radaelli and A.C. Hannon: Metall. and Mater. Trans. Vol. 32A (2001), p.1551.

Google Scholar

[2] P.R. Jemian, R.A. Gerhardt and G.G. Long: in press.

Google Scholar

[3] A.I. Lavrentyev and W.A. Veronesi: Rev. of Quant. Non-destr. Eval. Vol. 21 (2002), p.1659.

Google Scholar

[4] P. Haldipur, F.J. Margetan and R.B. Thompson: Rev. of Quant. Non-destr. Eval. Vol. 22 (2003), p.1355.

Google Scholar

[5] J. Kang, J. Qu, A. Saxena and L. Jacobs: Rev. of Quant. Non-destr. Eval. Vol. 23 (2004), p.1248.

Google Scholar

[6] R. Ferragut, A. Somoza and L. Torriaini: Mater. Sci. and Eng. Vol. A334 (2002), p.1.

Google Scholar

[7] C. Panseri and T. Federighi: Acta Metall. Vol. 8 (1959), p.217.

Google Scholar

[8] F. Yu and B. Nagy: Jrnl. of App. Phys. Vol. 95(12) (2004), p.1.

Google Scholar

[9] F. Yu and B. Nagy: Jrnl. of App. Phys. Vol. 96(2) (2004), p.1.

Google Scholar

[10] X. Zou, T. Makram and R.A. Gerhardt: Mater. Res. Symp. Proc. Vol. 699 (2002), p.301.

Google Scholar

[11] V. Siva Kumar G. Kelekanjeri and R.A. Gerhardt: Electrochim. Acta. Vol. 51(8-9) (2006) p.1873.

Google Scholar

[12] K. Pinkos, C. Laboy and R.A. Gerhardt: Mater. Res. Symp. Proc. Vol. 699 (2002), p.289.

Google Scholar

[13] H. Topsoe: GeometricFactors in Four Point Resistivity Measurement Bulletin 472-13 (1968).

Google Scholar

[14] H. Kimura and R. Maddin: Quench Hardening in Metals (North-Holland Pubslishing Company, Amsterdam 1971).

Google Scholar

[15] H.T. Kim, S.S. Chun, X.X. Yao, Y. Fang, J. Choi: Jrnl. of Mater. Sci. Vol. 32 (1997), p.4917.

Google Scholar