Low cycle fatigue and creep-fatigue behavior of Ni-based alloy 230 at 850°C

Xiang Chen, Zhiqing Yang, Mikhail A. Sokolov, Donald L. Erdman, Kun Mo, James F. Stubbins

Research output: Contribution to journalArticle

Abstract

Strain-controlled low cycle fatigue (LCF) and creep-fatigue testing of Ni-based alloy 230 were carried out at 850. °C. The material creep-fatigue life decreased compared with its low cycle fatigue life at the same total strain range. Longer hold time at peak tensile strain further reduced the material creep-fatigue life. Based on the electron backscatter diffraction, a novel material deformation characterization method was applied, which revealed that in low cycle fatigue testing as the total strain range increased, the deformation was segregated to grain boundaries since the test temperature was higher than the material equicohesive temperature and grain boundaries became weaker regions compared with grains. Creep-fatigue tests enhanced the localized deformation, resulting in material interior intergranular cracking, and accelerated material damage. Precipitation in alloy 230 helped slip dispersion, favorable for fatigue property, but grain boundary cellular precipitates formed after material exposure to the elevated temperature had a deleterious effect on the material low cycle fatigue and creep-fatigue property.

Original languageEnglish (US)
Pages (from-to)152-162
Number of pages11
JournalMaterials Science and Engineering A
Volume563
DOIs
StatePublished - Feb 15 2013

Keywords

  • Creep-fatigue
  • EBSD
  • Failure
  • High-temperature deformation
  • Nickel based superalloys
  • Precipitation

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Low cycle fatigue and creep-fatigue behavior of Ni-based alloy 230 at 850°C'. Together they form a unique fingerprint.

  • Cite this