Influence of temperature on primary water stress corrosion cracking (PWSCC) of Alloy 600 weld metals was studied at temperatures ranging from 330 to 360 °C using slow strain rate technique (SSRT). And crack growth rate was studied at temperature 360 °C using constant load tests. As the results, it has been revealed that the apparent activation energy of weld metal is about 30 kJ/mol higher than that of heat affected zone, and the PWSCC susceptibility of Alloy 82 is close to that of Alloy 132. It can be thought that the former fact is a reason for that the weld metal suffers PWSCC less frequently than the base metal of 600 alloys in actual PWR plants, though the weld metal suffers PWSCC more frequently in the laboratory conditions of higher temperature. The susceptibility on PWSCC of weld metal is higher than those of base metal and HAZ in initiation. The difference will become smaller at lower temperature.

Subject
Constant load, Crack growth, Materials, Gauges, Welding, Crack initiation, Activation energy, Stress cracking, Base metals, Alloys, Weld metal, Stress corrosion cracking, Test specimen
Keywords:
Alloy 600, Alloy 82, Alloy 132, stress corrosion cracking, primary water, SCC, PWSCC, gas tungsten arc welding, shielded metal arc welding, activation energy
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2004
Association for Materials Protection and Performance (AMPP)
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