Full Content is available to subscribers

Subscribe/Learn More  >

Effect of Crystallographic Properties on Low Cycle Fatigue Strength at Elevated Temperature for Ni-Based Directionally Solidified Superalloy

[+] Author Affiliations
Takashi Yokoyama, Masaru Sekihara

Mitsubishi Hitachi Power Systems, Ltd., Hitachi, Ibaraki, Japan

Paper No. GT2014-26704, pp. V07AT29A017; 9 pages
  • ASME Turbo Expo 2014: Turbine Technical Conference and Exposition
  • Volume 7A: Structures and Dynamics
  • Düsseldorf, Germany, June 16–20, 2014
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4576-9
  • Copyright © 2014 by ASME


Low cycle fatigue tests at elevated temperature were conducted on a Ni-based directionally solidified superalloy subjected to transverse loading. To investigate the effect of the arrangement and crystal orientation of grains on the crack initiation, the electron back-scatter diffraction (EBSD) method was applied on the surface of the tested specimens. In addition, finite element analysis that considered the plastic behavior of crystal grains was performed to evaluate the relationship between the crack initiation and the local stress or strain that develops near the grain boundaries. The results are summarized below. As for the effect of crystallographic properties in the specimen surface, cracks generally initiated near the grain boundaries that neighbored the grain whose secondary axis inclined to loading direction by more than 20 degrees and Schmid factor to uniaxial loading was more than 0.48. The crack location was not confirmed to correlate with the grain boundary misorientation of the neighboring grains on the surface. However, most cracks initiated near the grain boundaries that neighbored the grain whose secondary axis met the loading direction at a larger angle than the grain located in the opposite surface. The results of FEM analysis revealed that the location where high cumulative equivalent plastic strain developed generally corresponded to the crack location and that the cumulative equivalent plastic strain correlated with the number of crack initiation cycles.

Copyright © 2014 by ASME



Interactive Graphics


Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In