Statistical assessment of fatigue-initiating microstructural features in a polycrystalline disk alloy

William C. Lenthe, Jean Charles Stinville, McLean P. Echlin, Tresa M. Pollock

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


Fatigue is the life limiting property of polycrystalline nickel-base superalloys used for turbine disks. Fatigue cracks in René 88DT frequently initiate in large grains that are in the tail of the size distribution and contain favorably oriented annealing twin boundaries. High resolution three dimensional volumes of René 88DT have been collected via TriBeam tomography for analysis of grain structure and twin boundaries. Most twin boundaries were found to be highly coherent, allowing twin boundary inclination to be calculated using orientation measurements collected from two dimensional cross sections. This insight enables identification of fatigue initiating microstructural features in large two dimensional scans, providing initiation site statistics for a significant number of boundaries.

Original languageEnglish (US)
Title of host publicationSUPERALLOYS 2016 - Proceedings of the 13th International Symposium on Superalloys
EditorsMark Hardy, Eric Huron, Uwe Glatzel, Brian Griffin, Beth Lewis, Cathie Rae, Venkat Seetharaman, Sammy Tin
PublisherMinerals, Metals and Materials Society
Number of pages9
ISBN (Electronic)9781118996669
StatePublished - 2016
Externally publishedYes
Event13th International Symposium on Superalloys, SUPERALLOYS 2016 - Seven Springs, United States
Duration: Sep 11 2016Sep 15 2016

Publication series

NameProceedings of the International Symposium on Superalloys


Conference13th International Symposium on Superalloys, SUPERALLOYS 2016
Country/TerritoryUnited States
CitySeven Springs


  • Fatigue
  • Property volume element
  • René 88DT
  • Serial sectioning
  • Twin boundary

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics


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