Assessment of Surface Damage in Thermally Aged FSX414 Cobalt-Based Superalloy Using Ultrasonic Rayleigh Wave

2005 ◽  
Vol 475-479 ◽  
pp. 651-654
Author(s):  
Jai Won Byeon ◽  
C.S. Kim ◽  
Y.H. Kim ◽  
S.I. Kwun ◽  
S.J. Hong
Keyword(s):  
Rayleigh Wave ◽  
Nondestructive Evaluation ◽  
Aging Time ◽  
Wave Velocity ◽  
Microstructural Analysis ◽  
Surface Damage ◽  
Rayleigh Surface Wave ◽  
Rayleigh Wave Velocity ◽  
Evaluation Parameters

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°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.

CHARACTERIZATION OF SURFACE TREATED AERO ENGINE ALLOYS BY RAYLEIGH WAVE VELOCITY DISPERSION

2010 ◽  
Author(s):  
B. Köhler ◽  
M. Barth ◽  
F. Schubert ◽  
J. Bamberg ◽  
H.-U. Baron ◽  
...  
Keyword(s):  
Rayleigh Wave ◽  
Wave Velocity ◽  
Velocity Dispersion ◽  
Rayleigh Wave Velocity ◽  
Aero Engine

Evaluation of Corrosion Degradation of 12Cr Alloy Steel Using an Ultrasonic Backward Radiation

2003 ◽  
Vol 17 (08n09) ◽  
pp. 1653-1658 ◽  
Author(s):  
S. J. Song ◽  
Young H. Kim ◽  
D. H. Bae ◽  
M. H. Jung ◽  
S. D. Kwon
Keyword(s):  
Rayleigh Wave ◽  
Nondestructive Evaluation ◽  
Aging Time ◽  
Alloy Steel ◽  
Power Plants ◽  
Automated System ◽  
Rayleigh Surface Wave ◽  
Frequency Dependency ◽  
Angular Dependency ◽  
Backward Radiation

The corrosion degradation characteristics of the 12Cr alloy steel, which is widely used in fossil power plants as a turbine blade material, are evaluated nondestructively by use of the backward radiation of propagating Rayleigh wave. For this purpose, an automated system for measuring the ultrasonic backward radiation has been developed, and the frequency dependency of the Rayleigh surface wave has been investigated indirectly by observing the angular dependency of the acquired signals. The velocity of Rayleigh wave decreased as the increase of aging time, which implies the increase of the effective degraded layer thickness. And the peak amplitude of the radiation increased as aging time, which relates to the increase of inter-granular corrosion. The result observed in this study demonstrates high potential of the backward radiated ultrasound as a tool for nondestructive evaluation of the corrosion degradation characteristics of aged materials.

Deep structure of the Iberian Peninsula determined by Rayleigh wave velocity inversion

1992 ◽  
Vol 108 (1) ◽  
pp. 71-88 ◽  
Author(s):  
J. Badal ◽  
V. Corchete ◽  
G. Payo ◽  
F. J. Serón ◽  
J. A. Canas ◽  
...  
Keyword(s):  
Rayleigh Wave ◽  
Iberian Peninsula ◽  
Wave Velocity ◽  
Deep Structure ◽  
Velocity Inversion ◽  
Rayleigh Wave Velocity

Improved Rayleigh Wave Velocity Measurement for Nondestructive Early-Age Concrete Monitoring

2007 ◽  
Vol 18 (1) ◽  
pp. 45-68 ◽  
Author(s):  
Sung Woo Shin ◽  
Chung Bang Yun ◽  
John S. Popovics ◽  
Jae Hong Kim
Keyword(s):  
Rayleigh Wave ◽  
Wave Velocity ◽  
Velocity Measurement ◽  
Early Age ◽  
Rayleigh Wave Velocity ◽  
Early Age Concrete
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