Journal
MATERIALS CHARACTERIZATION
Volume 112, Issue -, Pages 87-97Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2015.12.005
Keywords
Stress corrosion cracking; Scanning electron microscopy; Transmission electron microscopy; Nickel alloy 52/52M/152; Weld; Light water reactor
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Funding
- U.S Nuclear Regulatory Commission [NRC-HQ-11-G-38-0036]
- DOE-ATR Program
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Ni-based weld alloys 52, 52M and 152 are extensively used in repair and mitigation of primary water stress corrosion cracking (SCC) in nuclear power plants. In the present study, a series of microstructure and microchemistry at the SCC tips of these alloys were examined with scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS), scanning transmission electron microscopy (STEM) and energy filtered transmission electron microscopy (EFTEM). The specimens have similar chemical compositions and testing conditions. Intergranular (IG) and transgranular (TG) SCC was observed in all of them. The cracks were filled with nickel-oxides and partial precipitations of chrome carbides (CrCs), niobium carbides (NbCs), titanium nitrides (TiNs) and silicon carbides (SiCs), while iron (Fe) was largely dissolved into the solution. However, the crack densities, lengths and distributions were different for all three specimens. (C) 2015 Elsevier Inc. All rights reserved.
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