Fatigue strength of Inconel 718 at elevated temperatures

N. Kawagoishi, Q. Chen, H. Nisitani

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Abstract

The strength of Inconel 718 under rotary bending fatigue is investigated at room temperature, 300, 500 and 600 °C in air. It is found that in the long-life region, the fatigue strength of a plain specimen is much higher at elevated temperatures than at room temperature, though the static strength decreases with the increase in temperature. The effect of temperature on the fatigue strength is examined in terms of the initiation and early growth behaviour of a small crack. The results are discussed in relation to the competition between the softening of the nickel matrix (γ phase) and the surface oxidation at elevated temperatures.

Original languageEnglish
Pages (from-to)209-216
Number of pages8
JournalFatigue and Fracture of Engineering Materials and Structures
Volume23
Issue number3
DOIs
Publication statusPublished - Mar 1 2000
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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