In aero engines mechanically high stressed components made of high-strength alloys like IN718 and Ti6Al4V are usually surface treated by shot-peening. Other methods, e.g. laser-peening, deep rolling and low plasticity burnishing are also available. All methods introduce compressive residual stress desired for minimizing sensitivity to fatigue or stress corrosion failure mechanisms, resulting in improved performance and increased lifetime of components. Beside that, also cold work is introduced in an amount varying from method to method. To determine the remaining life time of critical aero engine components like compressor and turbine discs, a quantitative non-destructive determination of compressive stresses is required. The opportunity to estimate residual stress in surface treated aero engine alloys by SAW phase velocity measurements has been re-examined. For that, original engine relevant material IN718 has been used. Contrary to other publications a significant effect of the surface treatment to the ultrasonic wave velocity was observed which disappeared after thermal treatment. Also preliminary measurements of the acousto-elastic coefficient fit into this picture.


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    Title :

    Rayleigh wave velocity dispersion for characterization of surface treated aero engine alloys


    Additional title:

    Rayleighwellen-Geschwindigkeitsdispersion zur Charakterisierung Oberflächen behandelter Legierungen für Flugzeugmotoren


    Contributors:


    Publication date :

    2010


    Size :

    10 Seiten, 9 Bilder, 1 Tabelle, 15 Quellen


    Remarks:

    (nicht paginiert)


    Type of media :

    Conference paper


    Type of material :

    Storage medium


    Language :

    English




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