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http://dx.doi.org/10.3795/KSME-A.2002.26.11.2322

Evaluation of Corrosion Degradation Characteristics of Turbine Blade Material Using Backward Radiated Ultrasound  

Song, Sung-Jin (성균관대학교 기계공학부)
Kim, Young-H. (성균관대학교 기계공학부)
Bae, Dong-Ho (성균관대학교 기계공학부)
Jung, Min-Ho (한국가스안전공사 가스안전시험연구원)
Kwon, Sung-Duk (안동대학교 물리학과)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.26, no.11, 2002 , pp. 2322-2327 More about this Journal
Abstract
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 radiated Rayleigh surface wave. In order to evaluate corrosion degradation characteristics, we constructed automated system for the backward radiation, and the frequency dependency of the Rayleigh surface wave is investigated indirectly by measuring the angular dependency of the backward radiation of the incident ultrasonic wave in the specimens. The velocity of the surface wave decrease as the increase of the aging time in the backward radiation profile, which seems to result from the increase of the effective degrading layer thickness. And, amplitude of the surface wave increase as the aging time, which seems to result from the increase of the intergranular corrosion. The result observed in this study demonstrates high potential of the backward radiated ultrasound as a tool for the nondestructive evaluation of the corrosion degradation characteristics of the aged materials.
Keywords
Corrosion Degradation; Backward Radiated Ultrasound; Rayleigh Surface Wave; Dispersion;
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