LIMITATIONS OF EDDY CURRENT RESIDUAL STRESS PROFILING IN SURFACE-TREATED ENGINE ALLOYS OF VARIOUS HARDNESS LEVELS

Journal Article · Mon Feb 22 00:00:00 EST 2010 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3362225· OSTI ID:21371012

Abu-Nabah, B A ^[1]; Hassan, W T ^[2]; Blodgett, M P ^[3]; Nagy, P B ^[4]

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1. General Electric Aviation, Cincinnati, OH 45221 (United States)
2. Rolls-Royce Corporation, Indianapolis, IN 46241 (United States)
3. Air Force Research Laboratory, WPAFB, Dayton, OH 45433 (United States)
4. University of Cincinnati, Cincinnati, OH 45221 (United States)

Recent research results indicated that eddy current conductivity measurements might be exploited for nondestructive evaluation of subsurface residual stresses in surface-treated nickel-base superalloy components. This paper presents new results that indicate that in some popular nickel-base superalloys the relationship between the electric conductivity profile and the sought residual stress profile is more tenuous than previously thought. It is shown that in IN718 the relationship is very sensitive to the state of precipitation hardening and, if left uncorrected, could render the eddy current technique unsuitable for residual stress profiling in components of 36 HRC or harder, i.e., in most critical engine applications. The presented experimental results show that the observed dramatic change in the eddy current response of hardened IN718 to surface treatment is caused by very fine nanometer-scale features of the microstructure, such as gamma' and gamma'' precipitates, rather than micrometer-scale features, such as changing grain size or carbide precipitates.

• OSTI ID: 21371012
• Journal Information: AIP Conference Proceedings, Vol. 1211, Issue 1; Conference: Review of progress in quantitative nondestructive evaluation, Kingston, RI (United States), 26-31 Jul 2009; Other Information: DOI: 10.1063/1.3362225; (c) 2010 American Institute of Physics; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CARBIDES
EDDY CURRENTS
ELECTRIC CONDUCTIVITY
GRAIN SIZE
HARDNESS
INCONEL 718
NONDESTRUCTIVE ANALYSIS
NONDESTRUCTIVE TESTING
PRECIPITATION
PRECIPITATION HARDENING
RESIDUAL STRESSES
SURFACE TREATMENTS
SURFACES
X-RAY DIFFRACTION
ALLOY-NI53CR19FE19NB5MO3
ALLOYS
ALUMINIUM ADDITIONS
ALUMINIUM ALLOYS
CARBON COMPOUNDS
CHEMICAL ANALYSIS
CHROMIUM ALLOYS
COHERENT SCATTERING
CORROSION RESISTANT ALLOYS
CURRENTS
DIFFRACTION
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
HARDENING
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INCONEL ALLOYS
IRON ALLOYS
MATERIALS
MATERIALS TESTING
MECHANICAL PROPERTIES
MICROSTRUCTURE
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIOBIUM ALLOYS
PHYSICAL PROPERTIES
SCATTERING
SEPARATION PROCESSES
SIZE
STRESSES
TESTING
TITANIUM ADDITIONS
TITANIUM ALLOYS
TRANSITION ELEMENT ALLOYS