Evaluation of Intergranular Corrosion of Austenitic Stainless Steel by Acoustic Microscope

摘要

Experiments were performed to confirm the applicability of acoustic microscopy to evaluate intergranular corrosion of austenitic stainless steel. While cold working slightly surface wave velocity, but the effects of surface roughness, solution heat treatment and sensitizing treatment on surface wave velocity were very small. Surface were velocity on specimens corroded in Strauss solution decreased according to sensitizing time at various sensitizing temperatures. This decrease of surface wave velocity by intergranular corrosion coincided with corrosion depth. From these results, it was concluded that the degree of intergranular corrosion can be evaluated by the measurement of surface wave velocity.