Small crack behavior and fracture of nickel-based superalloy under ultrasonic fatigue

Q. Chen, N. Kawagoishi, Q. Y. Wang, N. Yan, T. Ono, G. Hashiguchi

Research output: Contribution to journalConference articlepeer-review

34 Citations (Scopus)

Abstract

Fracture and small crack behavior in the very high cycle domain of 10 9 cycles were investigated with a nickel-based superalloy under ultrasonic fatigue in ambient air at room temperature. The influence of ultrasonic frequency is examined by comparing the results with those in conventional low frequency fatigue. It is found that fatigue strength increases as frequency is raised up to 19.5 kHz and the most of fatigue life is consumed in nucleating and propagating small cracks up to 100 μm. Transition of fracture mode from transgranular ductile fracture to cleavage-dominated fracture occurs beyond a critical stress intensity factor range of approximately 21MPam, leading to the catastrophic failure under ultrasonic fatigue.

Original languageEnglish
Pages (from-to)1227-1232
Number of pages6
JournalInternational Journal of Fatigue
Volume27
Issue number10-12
DOIs
Publication statusPublished - 2005 Oct
EventFatigue Damage of Structural Materials V -
Duration: 2004 Sep 192004 Sep 24

Keywords

  • Fatigue
  • High cycle
  • Nickel-based superalloy
  • Small crack
  • Ultrasonic

ASJC Scopus subject areas

  • Modelling and Simulation
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

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