Abstract
Strain-controlled low-cycle fatigue (LCF) tests were conducted on ductile cast iron (DCI) at strain rates of 0.02, 0.002, and 0.0002/s in the temperature range from room temperature to 1073 K (800 °C). A constitutive-damage model was developed within the integrated creep-fatigue theory (ICFT) framework on the premise of strain decomposition into rate-independent plasticity and time-dependent creep. Four major damage mechanisms: (i) plasticity-induced fatigue, (ii) intergranular embrittlement (IE), (iii) creep, and (iv) oxidation were considered in a nonlinear creep-fatigue interaction model which represents the overall damage accumulation process consisting of oxidation-assisted fatigue crack nucleation and propagation in coalescence with internally distributed damage (e.g., IE and creep), leading to final fracture. The model was found to agree with the experimental observations of the complex DCI-LCF phenomena, for which the linear damage summation rule would fail.
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Acknowledgments
The work was carried as collaboration between the National Research Council Canada (NRC) and Wescast Industries Inc. with partial financial support from the company. The TEM analysis was performed by Drs. Xiang Wang and Hatem Zurob at McMaster University. Luc Lafleur and Weijie Chen of NRC assisted in test equipment calibration and SEM fractorgraphy, respectively. Dr. Xiaoyang Liu of Wescast helped to construct Figure 26.
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The following pertains only to authors Wu, MacNeil, and Zhang: Published with permission of National Research Council of Canada (the Crown in Right of Canada).
Manuscript submitted January 9, 2014.
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Wu, X., Quan, G., MacNeil, R. et al. Failure Mechanisms and Damage Model of Ductile Cast Iron Under Low-Cycle Fatigue Conditions. Metall Mater Trans A 45, 5085–5097 (2014). https://doi.org/10.1007/s11661-014-2468-x
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DOI: https://doi.org/10.1007/s11661-014-2468-x