On the biaxial thermal creep-fatigue behavior of Ni-base Alloy 617 at 950 °C

Yang Zhong, Xiang Liu, Kuan Che Lan, Hoon Lee, D. K.L. Tsang, James F. Stubbins

Research output: Contribution to journalArticle

Abstract

A new in-situ biaxial creep-fatigue testing system was built to study the creep-fatigue interaction of Alloy 617, a nickel base alloy with potential structural applications in the Very High Temperature Reactor, up to 70 MPa at 950 °C. The results show that creep-fatigue life of Alloy 617 is reduced with increasing hold time and the cracking mode seems to be intergranular in all creep-fatigue samples. At the microstructural level, both cellular network dislocations and slip bands were observed in the creep-fatigue tested specimens. The portion of slip bands seems to increase with increasing fatigue damage fraction. Moreover, the dislocation density increased with increasing effective stress.

Original languageEnglish (US)
Article number105787
JournalInternational Journal of Fatigue
Volume139
DOIs
StatePublished - Oct 2020

Keywords

  • Alloy 617
  • Biaxial test system
  • Creep-fatigue

ASJC Scopus subject areas

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

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