Abstract
Crack tips prepared from Ni-based alloys after stress corrosion cracking testing in simulated pressurized water reactor primary water have been studied by high-resolution characterization. Diffusion-induced grain boundary migration (DIGM) was observed in all the cracks and its potential role on the crack propagation is discussed in detail. The extent of DIGM observed changed with grain boundary type and alloy composition, which could lead to different extent of retardation effects on the crack propagation. A method is proposed to quantify the role of DIGM on crack propagation based on the results obtained in this work.
Highlights
Crack tips prepared from Ni-based alloys after stress corrosion cracking testing in simulated pressurized water reactor primary water have been studied by high-resolution characterization
These alloys have a good service record, many become susceptible to stress corrosion cracking (SCC) under pressurized water reactor (PWR) primary water conditions
grain boundary migration (GBM) was reported in Ni-based alloys after tested in a high temperature hydrogenated steam at 480 °C, designed to simulate PWR primary water conditions, easier to set up [13,14,15,16]
Summary
Crack tips prepared from Ni-based alloys after stress corrosion cracking testing in simulated pressurized water reactor primary water have been studied by high-resolution characterization. A 20% cold-worked Alloy 60Ni has been chosen for this study since it exhibits an unusually high level of DIGM at crack tips combined with a lower CGR when compared to similar austenitic alloys under the same testing conditions [3]: simulated PWR primary water conditions (hydrogenated water: 500 ppm B + 2 ppm Li + 30 cc/kg dissolved H2) at 360 °C.
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