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자료유형
학술저널
저자정보
저널정보
한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제47권 제4호
발행연도
2015.1
수록면
454 - 460 (7page)

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Acoustic emission (AE) is one of the promising methods for detecting the formation ofstress corrosion cracks (SCCs) in laboratory tests. This method has the advantage of onlineinspection. Some studies have been conducted to investigate the characteristics of AEparameters during SCC propagation. However, it is difficult to classify the distinct featuresof SCC behavior. Because the previous studies were performed on slow strain rate test orcompact tension specimens, it is difficult to make certain correlations between AE signalsand actual SCC behavior in real tube-type specimens. In this study, the specimen was aAISI 304 stainless steel tube widely applied in the nuclear industry, and an accelerated testwas conducted at high temperature and pressure with a corrosive environmental condition. The study result indicated that intense AE signals were mainly detected in the elasticdeformation region, and a good correlation was observed between AE activity and crackgrowth. By contrast, the behavior of accumulated counts was divided into four regions. According to the waveform analysis, a specific waveform pattern was observed during SCCdevelopment. It is suggested that AE can be used to detect and monitor SCC initiation andpropagation in actual tubes.

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