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10284 SCC of Alloy 182 and 82 Weld Metals in BWR Water

Picture for 10284 SCC of Alloy 182 and 82 Weld Metals in BWR Water
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Product Number: 51300-10284-SG
ISBN: 10284 2010 CP
Author: Peter L. Andresen
Publication Date: 2010
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The stress corrosion crack growth rate was evaluated on controlled chemistries of Alloy 182 and Alloy 82 weld metals in 288° C BWR water. Variables included the effects of the composition/stabilization, stress intensity factor, dK/da, corrosion potential and water purity. In general, Alloy 82 weld metal only showed a ~2X lower growth rate than Alloy 182 weld metal. All materials showed a dependence on stress intensity factor of ~K2.2, consistent with other materials. Very strong effects of +dK/da (~100 – 1000X) were observed, but essentially no effect of –dK/da, compared to constant K data. Strong effects (~10X) of corrosion potential were observed, and relatively limited effects (~2X) of 0 – 30 ppb sulfate were observed.

Keywords: Stress corrosion cracking, nickel alloy weld metals, high temperature water, water chemistry, Alloy 182 weld metal, Alloy 82 weld metal, stress intensity factor
The stress corrosion crack growth rate was evaluated on controlled chemistries of Alloy 182 and Alloy 82 weld metals in 288° C BWR water. Variables included the effects of the composition/stabilization, stress intensity factor, dK/da, corrosion potential and water purity. In general, Alloy 82 weld metal only showed a ~2X lower growth rate than Alloy 182 weld metal. All materials showed a dependence on stress intensity factor of ~K2.2, consistent with other materials. Very strong effects of +dK/da (~100 – 1000X) were observed, but essentially no effect of –dK/da, compared to constant K data. Strong effects (~10X) of corrosion potential were observed, and relatively limited effects (~2X) of 0 – 30 ppb sulfate were observed.

Keywords: Stress corrosion cracking, nickel alloy weld metals, high temperature water, water chemistry, Alloy 182 weld metal, Alloy 82 weld metal, stress intensity factor
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