SCC initiation behavior of 15% cold forged specimens cut from four different alloy 182 weldments was investigated in 360°C simulated PWR primary water under constant load at the yield stress using direct current potential drop to perform in-situ monitoring of SCC initiation time. Within each weldment, one or more specimens underwent SCC initiation within 24 hours of reaching full load while some specimens had much longer initiation times, in a few cases exceeding 2500 hours. Detailed examinations were conducted on these specimens with a focus on different microstructural features such as preexisting defects, grain orientation and second phases, highlighting an important role of microstructure in crack initiation of alloy 182.
Revised: May 31, 2018 |
Published: October 7, 2018
Citation
Toloczko M.B., Z. Zhai, and S.M. Bruemmer. 2018.SCC Initiation Behavior of Alloy 182 in PWR Primary Water. In Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors (EDM 2017), edited by JH Jackson, D Paraventi and M Wrigth, 1, 137-160. Cham:Springer.PNNL-SA-128211.doi:10.1007/978-3-319-67244-1_9