定電位エッチングによる検出手法を用いたオーステナイト系ステンレス鋼の塑性変形機構の温度・鋼種依存性の調査
Inspection of Temperature / Steel Composition Dependency of Plastic Deformation Mechanismin Austenitic Stainless Steel by potentiostatic etching Detection Method.
著者:
帆加利 翔太 Shota HOKARI 鈴木 明好 Akiyoshi SUZUKI 渡辺 豊 Yutaka WATANABE
発刊日:
公開日:
DeformationNondestructive EvaluationPotentiostatic EtchingStainless SteelTwinPlastic Strain
概要
To ensure integrity of structures and components in nuclear power plants, the demand has been increased for establishing nondestructive method for detection of pre-existing plastic strain. In this study, potentiostatic etch ing method is applied to detect and quantitatively measure plastic strain imposed to austenitic stainless steels by tensile straining. After potentiostatic etching (1N HNO3, -600mVsce, 20min), twin lines and slip lines appe ar as etched lines on the surface of specimen because of the preferential dissolution of the both bands. Steel compositions affected deformation twin density. This can be explained by difference in stacking-fault energy. Tem perature at which straining was applied, also has affected deformation twin density, but there is one-to-one correlation between etched slip line density on the specimens strained at 250°C and pre-existing strain (1-22.5%).
