818 高強度ステンレス鋼の動的環境ぜい化き裂進展のナノスコピックその場観察(GS-3 動的特性)

概要

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By using the AFM system that enabled the in-situ nanoscopic observation of environmentally induced damage in a controlled environment under dynamic loading conditions, in-situ serial AFM observation of the stress corrosion (SC) crack, under both static and dynamic loading, was performed in a high-strength stainless steel. At the cathodic potential, both static and dynamic SC cracks grew with a zigzag path and in an unsteady manner, whereas the static SC crack at the free corrosion grew straight along a grain boundary in a steady manner. In these cases, the crack opening displacement (CTOD) fluctuates according to the crack growth acceleration and retardation. The observed crack growth rate of the Dynamic SCC was higher than that of the static SCC.
2004-03-17