Development of creep-dominant creep-fatigue testing for Alloy 617

Fraaz Tahir, Yongming Liu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Alloy 617’s resistance to creep, fatigue and oxidation damage makes it suitable for structural applications at high temperatures (800-1000°C). Existing experimental techniques for investigating the creep-fatigue response use strain-based cyclic loading with a dwell time to generate varying portions of fatigue and creep damage respectively. Due to rapid stress relaxation of Alloy 617 at high temperatures, strain-based creep-fatigue testing only generates fatigue-dominant damage. Tests that produce creep-dominant damage are therefore essential to fully understand the creep-fatigue interaction for this alloy. Designing creep-dominant creep-fatigue tests is a challenging task due to large inelastic strains produced at high temperatures. Thus, multiple testing profiles must be examined to achieve this goal. This paper presents the stress-strain curves and experimental observations for various testing profiles and also discusses the microstructural aspects of the failed specimens. The authors propose a new loading profile that produces a larger fraction of creep damage thereby completing the failure envelope of Alloy 617 on a creep-fatigue interaction diagram.

Original languageEnglish (US)
Title of host publication57th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624103926
StatePublished - 2016
Event57th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 2016 - San Diego, United States
Duration: Jan 4 2016Jan 8 2016

Other

Other57th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 2016
CountryUnited States
CitySan Diego
Period1/4/161/8/16

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Architecture
  • Mechanics of Materials

Fingerprint Dive into the research topics of 'Development of creep-dominant creep-fatigue testing for Alloy 617'. Together they form a unique fingerprint.

  • Cite this

    Tahir, F., & Liu, Y. (2016). Development of creep-dominant creep-fatigue testing for Alloy 617. In 57th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference American Institute of Aeronautics and Astronautics Inc, AIAA.