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박익근 ( Ik Keun Park ),박은수 ( Un Soo Park ),김현묵 ( Hyun Mook Kim ),안형근 ( Hyung Keun Ahn ),김정석 ( Chung Soek Kim ),권숙인 ( Sook In Kwun ),변재원 ( Jai Won Byeon ) 한국구조물진단유지관리공학회 2000 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.4 No.1
It is very important to evaluate the surface or subsurface microstructure because of th on mechanical properties of materials. Surface SH-wave which is horizontally polarized traveling along near surface and subsurface layer is an attractive technique for material difficulty in preparing specimens form in-service industrial facilities. In this stud evaluation for degraded structural materials used at high temperature by Surface SH-wave discussed. 2.25Cr-lMo steel specimens which were prepared by the isothermal aging heat tr 650° were evaluated by ultrasonic nondestructive evaluation techniques investigating th velocities, attenuation coefficient and amplitude spectra etc. In addition, it has verif the frequency-dependence of ultrasonic group velocity and attenuation coefficient using wav