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http://dx.doi.org/10.1016/j.net.2018.09.011

Crack growth and cracking behavior of Alloy 600/182 and Alloy 690/152 welds in simulated PWR primary water  

Lim, Yun Soo (Nuclear Materials Research Division, Korea Atomic Energy Research Institute)
Kim, Dong Jin (Nuclear Materials Research Division, Korea Atomic Energy Research Institute)
Kim, Sung Woo (Nuclear Materials Research Division, Korea Atomic Energy Research Institute)
Kim, Hong Pyo (Nuclear Materials Research Division, Korea Atomic Energy Research Institute)
Publication Information
Nuclear Engineering and Technology / v.51, no.1, 2019 , pp. 228-237 More about this Journal
Abstract
The crack growth responses of as-received and as-welded Alloy 600/182 and Alloy 690/152 welds to constant loading were measured by a direct current potential drop method using compact tension specimens in primary water at $325^{\circ}C$ simulating the normal operating conditions of a nuclear power plant. The as-received Alloy 600 showed crack growth rates (CGRs) between $9.6{\times}10^{-9}mm/s$ and $3.8{\times}10^{-8}mm/s$, and the as-welded Alloy 182 had CGRs between $7.9{\times}10^{-8}mm/s$ and $7.5{\times}10^{-7}mm/s$ within the range of the applied loadings. These results indicate that Alloys 600 and 182 are susceptible to cracking. The average CGR of the as-welded Alloy 152 was found to be $2.8{\times}10^{-9}mm/s$. Therefore, Alloy 152 was proven to be highly resistant to cracking. The as-received Alloy 690 showed no crack growth even with an inhomogeneous banded microstructure. The cracking mode of Alloys 600 and 182 was an intergranular cracking; however, Alloy 152 was revealed to have a mixed (intergranular + transgranular) cracking mode. It appears that the Cr concentration and the microstructural features significantly affect the cracking resistance and the cracking behavior of Ni-base alloys in PWR primary water.
Keywords
Alloys 600/182; Alloys 690/152; Welding; PWSCC; Crack growth rate; Crack propagation;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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