Abstract
Near-α titanium alloys are an integral part of aeroengines; however, since the 1970s, it has been recognized that laboratory and field components fail in a reduced number of cycles when a dwell at the peak stress is imposed. Research over the last few decades has shown that one of the primary reasons for the debit in fatigue life is related to the presence of microtexture in these alloys. Many aeroengine components were forged before the concept of microtexture, and its deleterious effects, had been realized. Thus, because of the increased potential for early failure of these components, a need exists for a nondestructive method to assess the degree of microtexture present in legacy hardware in order to separate those which are prone to dwell fatigue failure from those that are not. Hardware with a high degree of microtexture can be scheduled for more frequent inspections to reduce the risk of in-flight failure. The present work describes a methodology by which this can be achieved using ultrasonic attenuation measurements of the component in pulse-echo imaging mode. The results indicate nearly linear dependence of ultrasonic attenuation on microtextured region size in the d/λ = 0.1 to 1.0 range, where d and λ are the effective microtexture region size in the direction of wave propagation and the ultrasonic wavelength, respectively.
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Acknowledgments
The authors acknowledge Dr. A.P. Woodfield (GE Aviation, Evendale, OH) for many useful discussions and for providing guidance for the material selections made in this work. The authors are grateful to the Federal Aviation Administration (Grant No. 08-G-009) for funding this work. Several functions used for the elastic moduli calculations were part of the OdfPf software package written by Professor P.R. Dawson, D. Boyce and others at the Deformation Processing Lab (Cornell University, Ithaca, NY, http://anisotropy.mae.cornell.edu). The useful discussions with Dr. J.V. Bernier (Lawrence Livermore National Laboratory) and the assistance of J. Sosa (Center for Accelerated Maturation of Materials, OSU) with image processing are also appreciated. One of the authors (ALP) acknowledges the support and encouragement from the Air Force Research Laboratory Materials and Manufacturing Directorate management during the preparation of this manuscript. Another of the authors (AB) thanks the Director of DMRL (Hyderabad, India) for allowing him to work on the project and also for giving him permission to publish this work.
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Bhattacharjee, A., Pilchak, A.L., Lobkis, O.I. et al. Correlating Ultrasonic Attenuation and Microtexture in a Near-Alpha Titanium Alloy. Metall Mater Trans A 42, 2358–2372 (2011). https://doi.org/10.1007/s11661-011-0619-x
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DOI: https://doi.org/10.1007/s11661-011-0619-x