Nom-destructive Evaluation System for Corrosion and SCC by Using Micro-cell

为了定量研究腐蚀和应力腐蚀开裂（SCC）机理，提出了一种基于高倍率视频显微镜（VMS）观察和高灵敏度声发射（AE）测量薄板弯曲试样液滴内SCC的无损评价新技术。VMS和AE同时观察了SCC的发生和扩展过程。分析了304不锈钢加工硬化和固溶处理试样的裂纹萌生时间、裂纹扩展速度和裂纹扩展机理。

New corrosion and stress corrosion cracking (SCC) nondestructive evaluation technique was developed to be able to quantitative measurement for corrosion and SCC mechanisms.The method is based on the high-magnification video microscope (VMS) observation and high sensitivity acoustic emission measurement (AE) for SCC located in a droplet on bended thin plate specimen. The initiation and the propagation of SCC were observed by the VMS and AE simultaneously. The crack initiation time, the crack velocity and the crack propagation mechanism in Type 304 stainless steel of the work hardened and the solution treatment specimens were analyzed.