Effect of the Amplitude in Ultrasonic Nano-crystalline Surface Modification on the Corrosion Properties of Alloy 600
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초록
Surface modification techniques are known to improve SCC by adding large compressive residual stressesto metal surfaces. This surface modification technology is attracting attention because it is an economicaland practical technology compared to the maintenance method of existing nuclear power plants. Surfacemodification techniques include laser, water jet and ultrasonic peening, pinning and ultrasonic Nano-crystalsurface modification (UNSM). The focus of this study was on the effect of ultrasonic amplitude in UNSMtreatment on the corrosion properties of Alloy 600. A microstructure analysis was conducted using an opticalmicroscope (OM), scanning electron microscope (SEM) and electron backscattering diffraction (EBSD). Acyclic polarization test and AC-impedance measurement were both used to analyze the corrosion properties. UNSM treatment influences the corrosion resistance of Alloy 600 depending on its amplitude. Below thecritical amplitude value, the pitting corrosion properties are improved by grain refinement and compressiveresidual stress, but above the critical amplitude value, crevices are formed by the formation of overlappedwaves. These crevices act as corrosion initiators, reducing pitting corrosion resistance.
Abstract
Surface modification techniques are known to improve SCC by adding large compressive residual stressesto metal surfaces. This surface modification technology is attracting attention because it is an economicaland practical technology compared to the maintenance method of existing nuclear power plants. Surfacemodification techniques include laser, water jet and ultrasonic peening, pinning and ultrasonic Nano-crystalsurface modification (UNSM). The focus of this study was on the effect of ultrasonic amplitude in UNSMtreatment on the corrosion properties of Alloy 600. A microstructure analysis was conducted using an opticalmicroscope (OM), scanning electron microscope (SEM) and electron backscattering diffraction (EBSD). Acyclic polarization test and AC-impedance measurement were both used to analyze the corrosion properties. UNSM treatment influences the corrosion resistance of Alloy 600 depending on its amplitude. Below thecritical amplitude value, the pitting corrosion properties are improved by grain refinement and compressiveresidual stress, but above the critical amplitude value, crevices are formed by the formation of overlappedwaves. These crevices act as corrosion initiators, reducing pitting corrosion resistance.
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