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 article

24 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 - Oct 1 2005
Externally publishedYes
EventFatigue Damage of Structural Materials V -
Duration: Sep 19 2004Sep 24 2004

All Science Journal Classification (ASJC) codes

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

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