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Competing Modes for Crack Initiation from Non-metallic Inclusions and Intrinsic Microstructural Features During Fatigue in a Polycrystalline Nickel-Based Superalloy

  • Jean-Charles Stinville
  • Etienne Martin
  • Mallikarjun Karadge
  • Shak Ismonov
  • Monica Soare
  • Tim Hanlon
  • Sairam Sundaram
  • McLean P. Echlin
  • Patrick G. Callahan
  • William C. Lenthe
  • Jiashi Miao
  • Andrew E. Wessman
  • Rebecca Finlay
  • Adrian Loghin
  • Judson Marte
  • Tresa M. Pollock
Topical Collection: Superalloys and Their Applications
  • 43 Downloads
Part of the following topical collections:
  1. Third European Symposium on Superalloys and their Applications

Abstract

Cyclic fatigue experiments in the high and very high cycle fatigue regimes have been performed on a René 88DT polycrystalline nickel-based superalloy. The microstructural configurations that favor early strain localization and fatigue crack initiation at high temperature from 400 °C to 650 °C have been investigated. Competing failure modes are observed in the high to the very high cycle fatigue regime. Fatigue cracks initiate from non-metallic inclusions and from intrinsic internal microstructural features. Interestingly, as stresses are reduced into the very high cycle regime, there is a transition to initiation only at crystallographic facets. At higher stress in the high cycle fatigue regime, a significant fraction of specimens initiate cracks at non-metallic inclusions. This transition is analyzed with regard to microstructural features that favor strain localization and accumulate damage early during cycling.

Notes

Acknowledgments

The authors gratefully acknowledge the support of GE Global Research. We appreciate useful discussions with J. Laflen, J. Wayne Jones, and S. Ghosh. We acknowledge Grant No. FA9550-12-1-0445 to the Center of Excellence on Integrated Materials Modeling (CEIMM) at Johns Hopkins University (partners: AFRL, JHU, UIUC, UCSB), awarded by the AFOSR/Aerospace Materials for Extreme Environments Program (Program Manager Dr. Ali Sayir) and AFRL/RX (Monitors Drs. C. Woodward and C. Przybyla).

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2018

Authors and Affiliations

  • Jean-Charles Stinville
    • 1
  • Etienne Martin
    • 2
  • Mallikarjun Karadge
    • 2
  • Shak Ismonov
    • 2
  • Monica Soare
    • 2
  • Tim Hanlon
    • 2
  • Sairam Sundaram
    • 2
  • McLean P. Echlin
    • 1
  • Patrick G. Callahan
    • 1
  • William C. Lenthe
    • 1
  • Jiashi Miao
    • 4
  • Andrew E. Wessman
    • 3
  • Rebecca Finlay
    • 3
  • Adrian Loghin
    • 2
  • Judson Marte
    • 2
  • Tresa M. Pollock
    • 1
  1. 1.Materials DepartmentUniversity of California Santa BarbaraSanta BarbaraUSA
  2. 2.General Electric Global ResearchNiskayunaUSA
  3. 3.General Electric AviationCincinnatiUSA
  4. 4.Department of Materials Science and EngineeringUniversity of MichiganAnn ArborUSA

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