High temperature fatigue of the nickel-base single-crystal superalloy CMSX-10

R. Ohtani, N. Tada, M. Shibata, S. Taniyama

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Push-pull fatigue tests were conducted under a sinusoidal stress waveform with a frequency of 1 Hz and a trapezoidal one with a hold time in both tension and compression at 300 MPa-amplitude. Tests were conducted at a temperature of 1273 K using smooth bar specimens of the nickel-base single-crystal superalloy CMSX-10. Small cracks were observed on the surface of the interrupted specimens by means of optical and scanning electron microscopes and their number and length were measured. The fatigue behaviour was characterized as follows: (1) A number of small cracks were initiated at a relatively early stage on the grain boundaries of the surface oxide which were perpendicularly to the tensile stress axis direction. (2) Some of these cracks grew inside and reached the base metal. Their growth brought about final fracture of the specimen. (3) The creep strain during the stress hold period accelerated the growth rate of the small cracks and shortened the fatigue life.

Original languageEnglish
Pages (from-to)867-876
Number of pages10
JournalFatigue and Fracture of Engineering Materials and Structures
Volume24
Issue number12
DOIs
Publication statusPublished - Dec 1 2001

Keywords

  • CMSX-10
  • Fatigue
  • High temperature
  • Oxidation
  • Single-crystal superalloy
  • Small cracks

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'High temperature fatigue of the nickel-base single-crystal superalloy CMSX-10'. Together they form a unique fingerprint.

  • Cite this