13th International Conference on Fracture June 16–21, 2013, Beijing, China -7- (a) 816 °C (b) 927 °C Figure 4. Comparisons between the fitted and experimental da/dN of Hastelloy® X 5. Summary Key results and conclusions drawn from this investigation are summarized below: (1) The exponential form of interaction factor, η, could successfully characterize the intensity of the creep and fatigue interaction. (2) The established three-term crack growth model is capable of accurately representing and predicting the creep-fatigue crack growth behavior of FGH97. (3) The applicability of the three-term model on the nickel-based superalloys Alloy 718 and Hastelloy® X is satisfactory. References [1] J. Tong, S. Dalby, et al, Creep, fatigue and oxidation in crack growth in advanced nickel base superalloys. Int J Fatigue, 23(2001), 897-902. [2] R. Ohtani, T. Kitamura, et al, High-temperature low cycle fatigue crack propagation and life laws of smooth specimens derived from the crack propagation laws, in: H.D. Solomon, G.R. Halford, et al (Eds.), Low Cycle Fatigue, ASTM STP 942, Philadelphia, 1988, pp. 1163-1180. [3] F. Djavanroodi, Creep-fatigue crack growth interaction in nickel base supper alloy. American Journal of Applied Science, 5(2008), 454-460. [4] F. Z. Xuan, S. D. Tu, et al., Time-dependent fatigue fracture theory and residual life assessment techniques for defective structures. Chinese Journal of Advances in Mechanics, 35(2005), 391-403. [5] P. S. Grover, A. Saxena, Modelling the effect of creep-fatigue interaction on crack growth. Fatigue Frac Eng M, 22(1999), 111-122. [6] H.Q. Yang, R. Bao, et al., Creep-fatigue crack growth behaviour of a nickel-based powder metallurgy superalloy under high temperature. Eng Fail Anal, 18(2011), 1058-1066.
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