Metallographic Microscope Track Investigation of Stress Corrosion Cracking of the High-Strength Steels WOL

Metallographical microscope track investigation of stress corrosion cracking of high-strength steels WOL constant displacement specimen was performed. The results indicate that the slip line of stress corrosion cracking of high-strength steels pre-exists in notch front-end before the appearance of micro-crack. Hydrogen induces slip line and dislocation motion displacement step. Hydrogen can accelerate the local plastic deformation and the micro-cracks appear in gap front-end when the local plastic deformation reach to critical condition.