Affiliations: Innovative Materials Engineering, National Institute for Materials Science, Ibaraki, Japan | Department of Materials Engineering, School of Engineering, The University of Tokyo, Tokyo, Japan
Note: [] Address for correspondence: M. Shiwa, Innovative Materials Engineering, National Institute for Materials Science, 1-2-1, Sengen, Tsukuba, Ibaraki 305-0047, Japan. E-mail: SHIWA.Mitsuharu@nims.go.jp.
Abstract: A new monitoring method was proposed to study the mechanism of stress corrosion cracking (SCC). This method is a combination of the chloride droplet SCC monitoring system and the measurement system of continuous acoustic emission (AE) waveform, which were developed by our group. With the present method, the SCC was carried out on the thin plate of SUS304 stainless steel with a small MgCl2 droplet. The experiments show that the measured AE waveform had small amplitude and large noise component based on the time–frequency analysis of continuous waveform. A noise filtering parameter was applied to the measurement of continuous AE waveform. Cumulative AE events and peak amplitude distribution of two specimens were indicated similar tendency during testing time. Those AE signals may correspond to crack propagation and arrest. Therefore, the new SCC testing method of small MgCl2 droplet with high sensitivity AE monitoring demonstrated the analyzing capability of the SCC process.
