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Effect of Prior Creep Strain on High Cycle Fatigue Life of Ti 834

[+] Author Affiliations
Xijia Wu, Dongyi Seo

National Research Council Canada, Ottawa, ON, Canada

Marc Head, Stephen Chan

Siemens Canada Ltd., Dorval, QC, Canada

Paper No. GT2018-75259, pp. V006T24A006; 8 pages
doi:10.1115/GT2018-75259
From:
  • ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition
  • Volume 6: Ceramics; Controls, Diagnostics, and Instrumentation; Education; Manufacturing Materials and Metallurgy
  • Oslo, Norway, June 11–15, 2018
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5112-8
  • Copyright © 2018 by Siemens Canada Limited

abstract

Room-temperature fatigue tests were conducted on Ti 834 with prior creep strains accumulated under constant load at 550°C and 600°C, respectively. Microstructural and fractographic examinations on specimens with prior creep strain > 3% revealed the failure process consisting of multiple surface crack nucleation and internal void generation by creep, followed by fatigue crack propagation in coalescence with the internally distributed damage, leading to the final fracture. The amount of prior creep damage increased with creep strain. The fatigue life of Ti 834 was significantly reduced by prior creep straining. The behavior is rationalized with the integrated creep-fatigue theory.

Copyright © 2018 by Siemens Canada Limited

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