Abstract
Stress corrosion cracks in steel specimen under high temperature and high pressure were monitored using an optical fiber AE monitoring system developed in our laboratory. A sensing portion of the optical fiber was wound and fixed using polyimide films. A sample was fabricated by welding a low alloy steel plate with a carbon steel plate. AE signals were monitored for 2000 ks under a CBB test at 150℃, 0.5 MPa and 170℃, 0.75 MPa. Noise signals caused by the heater and autoclave were reduced by utilizing the correlation coefficient of AE waveforms and their frequency spectra. 29 AE signals were extracted after the noise reduction process. These AE signals were detected 1300 ks after start of AE monitoring. Cracks were observed on the surface of the specimen after the test. It was estimated that SCC was initiated during this time.
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