Abstract
Abstract Environmental cracking of ductile nickel-base alloys has occurred both in pressurized water reactors (e.g., steam-generator tubing) and boiling water reactor components such as pressure-vessel safe ends, weld butters, and filler metals for joining nickel-base alloys or dissimilar metals, and attachment welding pads on pressure vessels. Accurate assessment of the interrelated effects of material, environment, and mechanics on environmentally assisted crack growth rates is required for life prediction of nuclear power reactor components. The objective of this study is to understand and predict the environmental cracking behavior of ductile nickel-base alloys in 288° C water. Experiments were performed on 1T CT specimens of Alloy 600 base metal, and Alloy 182 and Alloy 82 weld metals to evaluate the effects of water chemistry, heat treatment, and stress intensity on crack growth rate. Fracture mechanics, crack growth data on ductile nickel-base alloys were also thoroughly surveyed to provide an over...
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