A Mathematical Framework for Cyclic Life Prediction of Directionally Solidified Nickel Superalloys

Abstract:

Modern gas turbines utilize single crystal (SX) and directionally solidified (DS) nickel superalloys which hold a higher cyclic life resistance and an improved creep rupture strength compared to their conventionally cast (CC) version. Both, SX and DS materials feature a significant direction dependence of material properties, which needs to be considered in the constitutive and lifing models. In this context, the paper presents a mathematical framework of cyclic life prediction. Although the method is developed for DS nickel alloys with transverse isotropic material behaviour, a generalisation to common orthotropic materials inclu¬ding SX is straightforward. The proposed procedure is validated by two examples. Moreover, an application to turbine components is shown.

• Periodical: Advanced Materials Research (Volume 278)
• Pages: 363-368
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.278.363
• Online since: July 2011
• Authors: Roland Mücke
• Keywords: Anisotropy, Directionally Solidified, Fatigue, Lifetime Prediction, Superalloy

References

[1] C. T. Sims, N. S. Stoloff, W. C. Hagel, Superalloys II, High Temperature Materials for Aerospace and Industrial Power, Wiley, 1987, ISBN 978-0-471-01147-7.

[2] D. N. Robinson, Constitutive relationships for anisotropic high-temperature alloys, Nuclear Engineering and Design 83 (1984) 389-396.

DOI: 10.1016/0029-5493(84)90131-6

[3] R. Mücke, O. -E. Bernhardi, A constitutive model for anisotropic materials based on Neuber's rule, Comp. Methods Appl. Mech. Engrg. 192 (2003) 4237-4255.

DOI: 10.1016/s0045-7825(03)00415-8

[4] S. Suresh, Fatigue of materials, Cambridge University Press 1991, Reprint (1994).

[5] R. Mücke, P. Woratat, A cyclic life prediction approach for directionally solidified nickel superalloys, Paper No. GT2009-59180, In Proceedings of the ASME Turbo Expo 2009: Power for Land, Sea and Air, June 8-12, 2009, Orlando, Florida, U.S. A.

DOI: 10.1115/1.3205027

[6] S. C. Cowin, M. M. Mehrabadi, Anisotropic symmetries of linear elasticity, Appl. Mech Rev 48 / 5 (1995) 247-285.

DOI: 10.1115/1.3005102

[7] J. Lemaitre, J. -L. Chaboche, Mechanics of solid materials, Cambridge University Press, (1990).

[8] H. -A. Kuhn, H. -G. Sockel, Elastic properties of textured and directionally solidified Nickel-based superalloys between 25 and 1200°C, Materials Science and Engineering, A112 (1989) 117-126.

DOI: 10.1016/0921-5093(89)90350-x

[9] T. Hasebe, M. Sakane, M. Ohnami, Elastic anisotropy of directionally solidified superalloys, Journal of Engineering Materials and Technology 114 (1992) 141-148.

DOI: 10.1115/1.2904153

[10] T. Hasebe, M. Sakane, M. Ohnami, High temperature low cycle fatigue and cyclic constitutive relation of Mar-M247 directionally solidified superalloy, Journal of Engineering Materials and Technology 114 (1992) 162-167.

DOI: 10.1115/1.2904156

[11] W.H. Press, S.A. Teukolsky, W.T. Vetterling, B.P. Flannery, Numerical recipes, Cambridge University Press, Cambridge, (1992).

DOI: 10.1017/s0263574700010675