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首页> 外文期刊>Key engineering materials >Fatigue Crack Propagation Behavior and Degradation Characteristics of STS316L by Nondestructive Evaluation
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Fatigue Crack Propagation Behavior and Degradation Characteristics of STS316L by Nondestructive Evaluation

机译：Fatigue Crack Propagation Behavior and Degradation Characteristics of STS316L by Nondestructive Evaluation

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摘要

In this research, the development of real time-distance monitoring technology was tried. The results for the remainder life prediction of the facilities showed that: 1) The longitudinal wave velocity and the center frequency have similar change behavior to the constant log C of the Paris equation. 2) The attenuation factor also has similar change behavior to the constant m of the Paris equation that is the slope on the log-log plot. Regarding the evaluation of degradation extent after the degradation processing, the results were as follow: 1) On the base metal: The longitudinal wave velocity and the center frequency of the base metal showed the tendency to attenuate by the increase of grain size and the anisotropy of structure. On the other hand, the attenuation factor showed the conflicting behavior with the longitudinal wave velocity. 2) On the welded metal: The center frequency showed the tendency to decrease by the increase of the ferrite contents and the distribution anisotropy of the ferrite phase. Therefore, from the results of this research, it is expected that the technology, which is of the real-time evaluation of degradation extent and the remainder life prediction of the facilities while operating, can be possibly by the ultrasonic inspection method.

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