Assessment of surface damage in thermally aged FSX414 cobalt-based superalloy using ultrasonic Rayleigh wave

    Authors

    J. W. Byeon; C. S. Kim; Y. H. Kim; S. I. Kwun;S. J. Hong

    Comments

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    Keywords

    ultrasonic Rayleigh wave; nondestructive evaluation; Co-based; superalloy; thermal degradation; NONDESTRUCTIVE EVALUATION; CREEP; Materials Science, Multidisciplinary; Metallurgy & Metallurgical; Engineering

    Abstract

    An attempt was made to assess the surface damage in the isothermally degraded FSX414 Co-based superalloy using ultrasonic Rayleigh surface wave. Microstructural analysis (amount of solute Cr near the surface) and measurement of ultrasonic velocity and attenuation were performed after isothermal degradation heat treatment at 1100 degrees C for up to 4000 hours. Rayleigh wave velocity was observed to increase with aging time, which was attributed to the increased depletion of Cr near the surface. Strong frequency dependence of Rayleigh wave velocity was found in the specimens with surface depletion layer. Attenuation coefficient of Rayleigh wave increased with increasing aging time. Therefore, both attenuation and velocity of ultrasonic Rayleigh wave are suggested as potential nondestructive evaluation parameters for the characterization of the thermally aged FSX414 superalloy.

    Journal Title

    Pricm 5: The Fifth Pacific Rim International Conference on Advanced Materials and Processing, Pts 1-5

    Volume

    475-479

    Publication Date

    1-1-2005

    Document Type

    Article

    Language

    English

    First Page

    651

    Last Page

    654

    WOS Identifier

    WOS:000227494709149

    ISSN

    0255-5476; 0-87849-960-1

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