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Taivalaho, Laura
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document
Effects of water chemistry transients on crack growth rate of nickel-based weld metals
Abstract
Stress corrosion crack growth rates of Alloy 182 and 82weld metals in thermally aged (400°C/200 h) conditionshave been measured in simulated BWR conditions. Theeffects of water chemistry impurity concentrationtransients on crack growth rate and cracking morphologyhave been studied. The time for onset of acceleratedcrack growth due to impurity / conductivity transient wasmeasured when the conductivity of the coolant wasadjusted by additions of sulphate as H2SO4 in the rangeof 10-100 ppb. Crack growth was monitored using potentialdrop method during slow rising displacement testingapplied to 10x10 mm2 cross section, fatigue pre-cracked,three point bend specimens. The delay in crack growthrate slow down after returning to high purity water wasalso measured.In the tests an increase in the crack growth rate becamevisible in Alloy 182 within 25-45 h after sulphate wasintroduced into the bulk water. Although there is noreason or consistent data to support a permanent increasein crack growth rate caused by a sulphate transient, themeasured crack growth rate did not return back to thelevel prevailing prior to the transient. In Alloy 82 nocrack growth was observed with any of the appliedconditions of this study. Crack growth rates weremeasured also for cold deformed AISI 316NG and furnacesensitised AISI 304 stainless steels, as reference.