Abstract
The effect of dissolved oxygen (DO) content and the resultant electrochemical potential on the stress corrosion cracking growth rate of 316L weld metals in simulated boiling water reactor environments was investigated by using fracture mechanics specimens and in-situ crack growth monitoring. The fracture surfaces show extensive interdendritic stress corrosion characteristics. The crack growth rate in 2ppm DO water is significantly higher that in 0.2ppm DO water. The effect of higher DO concentrations such as 7.5ppm or 11ppm on crack growth rate are different for 316L weld metals with different ferrite contents.
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