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A model for creep-fatigue interaction in terms of crack-tip stress relaxation

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Abstract

A model was developed to explain the mechanism of the degradation of fatigue lives caused by the growth of transgranular crack without cavitational damage in spite of the creep-fatigue loading condition for some type 304L stainless steel and 1Cr-Mo-V steel. The model was developed by incorporating the stress relaxation effect during tensile hold time into the pure fatigue crack growth model based on the crack-tip shearing process. In the crack-tip region, the stress relaxation during hold time at the tensile peak stress reduces the maximum stress level but accumulates inelastic strain, which induces creep crack growth during hold time and enhances subsequent fatigue crack growth during subsequent loading by promoting the crack-tip shearing process. The predicted creep-fatigue lives by the model were in good agreement with the actual lives for type 304L stainless steel at 823 and 865 K and for 1Cr-Mo-V rotor steel at 823 K. The model was further expanded to explain the degradation of the life under the conditions of compressive hold cycling for 1Cr-Mo-V and 12Cr-Mo-V steels.

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Authors and Affiliations

  1. the Nuclear Materials Technology Division, Korea Atomic Energy Research Institute, 305-600, Taejon, Korea

    Yong Jun Oh (Senior Researcher) & Jun Hwa Hong (Director)

  2. the Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 305-701, Taejon, Korea

    Soo Woo Nam (Professor)

Authors
  1. Yong Jun Oh
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  2. Jun Hwa Hong
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  3. Soo Woo Nam
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Oh, Y.J., Hong, J.H. & Nam, S.W. A model for creep-fatigue interaction in terms of crack-tip stress relaxation. Metall Mater Trans A 31, 1761–1775 (2000). https://doi.org/10.1007/s11661-998-0327-3

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  • DOI: https://doi.org/10.1007/s11661-998-0327-3

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