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Thermomechanical Fatigue of Ductile Cast Iron and Its Life Prediction

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Abstract

Thermomechanical fatigue (TMF) behaviors of ductile cast iron (DCI) were investigated under out-of-phase (OP), in-phase (IP), and constrained strain-control conditions with temperature hold in various temperature ranges: 573 K to 1073 K, 723 K to 1073 K, and 433 K to 873 K (300 °C to 800 °C, 450 °C to 800 °C, and 160 °C to 600 °C). The integrated creep-fatigue theory (ICFT) model was incorporated into the finite element method to simulate the hysteresis behavior and predict the TMF life of DCI under those test conditions. With the consideration of four deformation/damage mechanisms: (i) plasticity-induced fatigue, (ii) intergranular embrittlement, (iii) creep, and (iv) oxidation, as revealed from the previous study on low cycle fatigue of the material, the model delineates the contributions of these physical mechanisms in the asymmetrical hysteresis behavior and the damage accumulation process leading to final TMF failure. This study shows that the ICFT model can simulate the stress–strain response and life of DCI under complex TMF loading profiles (OP and IP, and constrained with temperature hold).

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Acknowledgments

Fractographic micrographs were taken by Weijie Chen (formerly research officer) and Dave Chow (technical officer) of National Research Council Canada.

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Authors and Affiliations

  1. Structures, Materials and Manufacturing, Aerospace, National Research Council Canada, 1200 Montreal Rd., M13, Ottawa, ON, K1A 0R6, Canada

    Xijia Wu (Senior Research Officer), Ryan MacNeil (Technical Officer) & Zhong Zhang (Research Officer)

  2. Wescast Industries Inc., 150 Savannah Oaks Dr., Brantford, ON, N3T 5V7, Canada

    Guangchun Quan (Materials and Testing Leader), Xiaoyang Liu (Materials Scientist) & Clayton Sloss (Product Engineering Director)

Authors
  1. Xijia Wu
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  2. Guangchun Quan
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  3. Ryan MacNeil
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  4. Zhong Zhang
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  5. Xiaoyang Liu
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  6. Clayton Sloss
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Correspondence to Xijia Wu.

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©Published with permission of the Crown in Right of Canada pertains to Xijia Wu, Ryan MacNeil, and Zhong Zhang.

Manuscript submitted October 2, 2014.

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Wu, X., Quan, G., MacNeil, R. et al. Thermomechanical Fatigue of Ductile Cast Iron and Its Life Prediction. Metall Mater Trans A 46, 2530–2543 (2015). https://doi.org/10.1007/s11661-015-2873-9

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  • DOI: https://doi.org/10.1007/s11661-015-2873-9

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