Ultrasonic Evaluation of Creep Damage of High Temperature Metallic Materials with Different Microstructures

Byeon, Jai-Won; Song, Jinliang; Kwun, S.I.

doi:10.4028/www.scientific.net/kem.270-273.120

Cited by 3 publications

(1 citation statement)

References 10 publications

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“…Establishment of robust non-destructive evaluation (NDE) techniques to detect sub-critical, yet significant blade damages prior to a crack initiation can substantially enhance the reliability, availability and maintainability of advanced turbine engines. Ultrasonic wave [4,5], electrical resistivity [6] and magnetic [7] methods have been applied as NDE techniques to evaluate the material degradation in high temperature structures.…”

Section: Introductionmentioning

confidence: 99%

Quality Monitoring of Thermally Degraded Stationary Gas Turbine Blade Material by Surface Wave Technique

Byeon¹,

Kim²,

Song³

et al. 2005

KEM

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For the quality monitoring and reliable application of stationary gas turbine blade (vane), near surface damages in the isothermally degraded vein material (i.e., cobalt based superalloy) were characterized by ultrasonic surface wave technique. Surface wave velocity and attenuation were measured for the artificially degraded specimens at 1100°C, together with microstructural analysis and micro-hardness measurement. Surface wave velocity increased with thermal degradation time, which was attributed to the increasing depletion of solute chromium near the surface. Strong frequency dependence of surface wave velocity was observed in the specimens with surface depletion layer. Attenuation coefficient of surface wave increased with increasing degradation time. The potential of ultrasonic surface wave technique to assess near surface damages in vein material was discussed with an emphasis on the relationship between the microstructural damage and the governing principles of ultrasonic response.

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