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09414 Effect of Dissolved H2 on SCC of Ni Alloys and Weld Metals

Picture for 09414 Effect of Dissolved H2 on SCC of Ni Alloys and Weld Metals
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Product Number: 51300-09414-SG
ISBN: 09414 2009 CP
Author: Kawait Ahluwalia, Peter L. Andresen, John Wilson and John Hickling
Publication Date: 2009
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Stress corrosion cracking (SCC) of nickel alloys such as Alloy 600 and Alloy 182, 132 and 82 weld metals in high temperature water is important because these materials are widely used in the pressurized water reactor (PWR) primary system. Based on plant experience, SCC will continue to increase as plants age without effective mitigation. There is a significant peak in crack growth rate vs. dissolved H2 for nickel alloy weld metals, and therefore mitigation is possible by optimizing the dissolved H2 concentration. By comparison, there is little effect on crack growth rate of boron and lithium levels.

Keywords: Stress corrosion cracking, Ni alloys, Ni Alloy weld metals, Alloy 600, water chemistry, dissolved hydrogen, high temperature water
Stress corrosion cracking (SCC) of nickel alloys such as Alloy 600 and Alloy 182, 132 and 82 weld metals in high temperature water is important because these materials are widely used in the pressurized water reactor (PWR) primary system. Based on plant experience, SCC will continue to increase as plants age without effective mitigation. There is a significant peak in crack growth rate vs. dissolved H2 for nickel alloy weld metals, and therefore mitigation is possible by optimizing the dissolved H2 concentration. By comparison, there is little effect on crack growth rate of boron and lithium levels.

Keywords: Stress corrosion cracking, Ni alloys, Ni Alloy weld metals, Alloy 600, water chemistry, dissolved hydrogen, high temperature water
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This work was undertaken to explore the possibility to extend the limits of 316L to higher temperatures.  The large scale test consists of a full ring pipe which is stressed externally and exposed internally to the test fluid.  The small scale tests are four-point-bend (4PB) tests in accordance with ISO15156-31 and EFC172.
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