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Inclusion size effect on the fatigue crack propagation mechanism and fracture mechanics of a superalloy

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Abstract

Low cycle fatigue life of nickel-base superalloys is enhanced as a consequence of inclusion reduction in the melt process; however, the functional dependencies between fatigue characteristics and inclusions have not been well investigated. In this study, the propagation mechanism of the fatigue crack initiated from inclusions is examined in fine-grained IN718, which is a representative turbine disc material for jet engines. There is a faceted-striated crack transition on the fracture surfaces. This faceted-striated transition also appears in theda/dN vs crack length curves. It is observed that the faceted crack propagation time can be more than 50 pct of total lifetime in the low cycle fatigue test. The significance of inclusion size effect is explained on the premise that the faceted fatigue crack propagation time scales with the inclusion size, which is taken as the initial crack length. A predictive protocol for determining inclusion size effect is given.

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Authors and Affiliations

  1. Visiting Scholar from Nippon Mining Company, Tokyo, Japan

    Takeshi Denda

  2. The Strategic Materials R&D Laboratory, The University of Texas at Austin, 78712-1063, Austin, TX

    Perter L. Bretz (Graduate Research Assistant) & John K. Tien (Engineering Regents Chair Holder and Director)

Authors
  1. Takeshi Denda
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  2. Perter L. Bretz
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  3. John K. Tien
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Denda, T., Bretz, P.L. & Tien, J.K. Inclusion size effect on the fatigue crack propagation mechanism and fracture mechanics of a superalloy. Metall Trans A 23, 519–526 (1992). https://doi.org/10.1007/BF02801169

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  • DOI: https://doi.org/10.1007/BF02801169

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