PWSCC GROWTH RATES OF ALLOY 690 AND ITS WELD METALS

摘要

Cold worked Alloy 690 and as-weld-deposited Alloys 152 and 52 were tested in representative pressurized water reactor primary water at 340 and 360 °C. Intergranular cracking was observed on Alloy 690 at constant stress intensity factor (no cycling) and with "gentle" cyclic loading. No evidence of interdendritic cracking was observed in the weld metals. Crack growth rates in most cases were in the range of 1 to 10 × 10~(-9) mm/s, but growth rates as high as 4 × 10~(-7) mm/s were observed in 1-dimension cold rolled Alloy 690 tested in the S-L orientation.