Diffraction Strain Measurements for the Characterization of Residual Stresses in Welds for Gas Turbine Applications

D. Dye, K. T. Conlon, R. C. Reed, K. E. James, A. M. Korsunsky

Research output: Contribution to conferencePaperpeer-review

2 Citations (Scopus)

Abstract

Neutron and synchrotron x-ray diffraction strain measurements around gas tungsten arc and electron beam welds are used to characterise the state of residual stress in an aero-engine component and testpieces in wrought nickel-base super-alloys. Spatial resolution is typically found to be around 1 mm and typical counting times are around 15 minutes per orientation for neutron diffraction and 10s for synchrotron x-rays. The effects of intergranular, orientation-dependent strains are discussed and their avoidance in the determination of engineering strain illustrated. Grain size and beam divergence are found to limit the spatial resolution that can be achieved, and this illustrates why in-weld measurements made using these techniques can be unreliable. These effects are explored using case studies in gas tungsten arc, electron beam and low stress low distortion welds in IN718 and C263 and electron-beam welds in a Waspaloy plate and compressor disc assembly.

Original languageEnglish
Pages878-885
Number of pages8
Publication statusPublished - 2002
Externally publishedYes
EventTrends in Welding Research: Proceedings of the 6th International Conference - Phoenix, AZ, United States
Duration: 15 Apr 200219 Apr 2002

Conference

ConferenceTrends in Welding Research: Proceedings of the 6th International Conference
Country/TerritoryUnited States
CityPhoenix, AZ
Period15/04/0219/04/02

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