Abstract
In recent years, the demand has been increased for establishing nondestructive inspection technique for detection of pre-existing plastic strain to ensure integrity of the structure such as nuclear power plant. In this study, electrochemical technique (potentiostatic etching) is applied to detect and measure plastic strain imposed to austenitic stainless steel by tensile straining. After potentiostatic etching (1N HNO_3, -600mV_<SCE> 20min), the slip line appears as etched line on the surface of specimen. The etched slip line is observed by optical microscope and quantified as the etched slip line density. There is one to one relation between the etched slip line density and the amount of pre existing plastic strain in the range from 1% to 30%.
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