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The effect of prior monotonic creep on the resultant fracture toughness and tensile properties of Inconel X-750

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Abstract

Precipitation-hardened polycrystalline nickel-base superalloy type Inconel X-750 was loaded at 700° C and crept to increasing fractions of its creep life. Secondary small fracture-toughness specimens and standard tensile specimens were machined from the initial rather large creep specimens. The secondary specimens were used to study the resultant resistance of the crept alloy to the extension of sharp cracks and its resultant tensile properties as functions of the amount of prior creep. Intergranular formation and coalescence of voids, which took place during the creep process, were responsible for a drastic reduction in the fracture toughness of the alloy long before it reached the end of its creep life. This behaviour indicates that possible deleterious changes in fracture toughness may be the governing factor which determines the useful and safe lives of materials which serve while loaded at high temperatures.

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Authors and Affiliations

  1. Department of Metallurgical Engineering, The Ohio State University, 43210, Columbus, Ohio, USA

    A. Arbel

  2. Navel Research Laboratory, Code 6320, 20375, Washington, DC, USA

    C. S. Pande

Authors
  1. A. Arbel
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  2. C. S. Pande
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Arbel, A., Pande, C.S. The effect of prior monotonic creep on the resultant fracture toughness and tensile properties of Inconel X-750. J Mater Sci 23, 3375–3378 (1988). https://doi.org/10.1007/BF00551321

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  • DOI: https://doi.org/10.1007/BF00551321

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