High temperature fatigue crack growth slip irreversibility

G. J. Pataky, H. Sehitoglu

Research output: Contribution to conferencePaperpeer-review

Abstract

Fatigue crack growth (FCG) and eventual fracture can lead to catastrophic failures in an elevated temperature environment. Haynes 230, a nickel-based superalloy, was found to have FCG rates over an order of magnitude greater at 900 °C compared to room temperature results. FCG experiments were performed using digital image correlation (DIC). Crack closure in the wake revealed no significant differences. Crack tip mechanisms were then investigated and revealed an order of magnitude higher slip irreversibly at 900 °C compared to room temperature magnitudes. These results were captured at low magnification inspiring further development of a high resolution, high temperature capable DIC technique. As proof of concept, an interrupted tensile experiment was performed at 700 °C with high resolution DIC measuring sub-grain strains. High strain heterogeneity was revealed with concentrations at grain boundaries. Future work will extend the technique to slip irreversibility experiments to measure grain boundary resistance to crack growth.

Original languageEnglish (US)
Pages1016-1017
Number of pages2
StatePublished - Jan 1 2017
Event14th International Conference on Fracture, ICF 2017 - Rhodes, Greece
Duration: Jun 18 2017Jun 20 2017

Conference

Conference14th International Conference on Fracture, ICF 2017
CountryGreece
CityRhodes
Period6/18/176/20/17

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction

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