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Detection and Characterization of Intergranular Stress Corrosion Cracking on Sensitized 304 Stainless Steel by Acoustic Emission Techniques

The present study was conducted on sensitized 304 stainless steels in 0.5mol/L Na2S2O3 solution under the slow strain rate testing (SSRT). To monitor the evolution of intergranular stress corrosion cracking (IGSCC) occurring, acoustic emission (AE) technology was applied in this test. Besides, signal characteristics of different AE sources, including the dissolution along susceptible grain boundaries, the plastic deformation ahead of the crack tip and the mechanical fractures of material ligaments, were identified distinctly with fractography and clustering analysis.