Characteristics of small crack growth in a nickel-base superalloy

Norio Kawagoishi, Qiang Chen, Hideho Tanaka, Ichiro Maeno, Jun ichi Kiyofuji

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Rotating bending fatigue tests were carried out for Inconel 718 at room temperature to investigate the growth characteristics of a small crack. It was found that: (1) The crack initiated at the grain boundary and then propagated as a transgranular crack. (2) When the stress level was higher than the fatigue limit, the fatigue life was mainly controlled by the growth life of a crack smaller than 1 mm. (3) The fatigue limit was a limiting stress for the crack propagation. (4) At low stress levels (σa0.2<0.5, σa: stress amplitude, (σ0.2:0.2% proof stress), the crack growth rate was determined by the stress intensity factor range ΔK; and at high stress levels (σa0.2>0.6), it was determined by the small crack growth law.

Original languageEnglish
Pages (from-to)1398-1402
Number of pages5
JournalNippon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Volume63 A
Issue number611
DOIs
Publication statusPublished - Jan 1 1997
Externally publishedYes

All Science Journal Classification (ASJC) codes

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

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