Abstract
Nickel-based superalloys exhibit sustained load crack growth at elevated temperatures, which significantly contributes to the total fatigue crack growth rate when Kmax is above the threshold value for sustained load cracking, KIEAC. Two empirical curve fitting models, the MSE model and SINH model, have been developed for describing the constants in the crack growth rate equations as a function of the cycling variables for nickel-based superalloys at elevated temperatures. It has been demonstrated that the superposition approach with MSE or SINH fitting was particularly powerful to predict fatigue crack growth rates for nickel-based superalloys at temperatures above 500°C.
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Kim, S.S., Choe, S.J. & Shin, K.S. Quantitative models on corrosion fatigue crack growth rates in metals: Part II. application of fatigue crack growth rate modeling for nickel-based superalloys at elevated temperatures. Metals and Materials 4, 15–23 (1998). https://doi.org/10.1007/BF03026060
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DOI: https://doi.org/10.1007/BF03026060