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후방복사된 초음파를 이용한 터빈 블레이드 재료의 부식 열화특성 평가
송성진,김영환,배동호,정민호,권성덕,Song, Sung-Jin,Kim, Young-H.,Bae, Dong-Ho,Jung, Min-Ho,Kwon, Sung-Duk 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.11
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.