Characterization of stress corrosion cracks in Ni-based weld alloys 52, 52M and 152 grown in high-temperature water
- Nuclear Engineering Program, The Ohio State University, Columbus, OH 43210 (United States)
- Department of Materials Science and Engineering, Boise State University, Boise, ID 83725 (United States)
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. - Highlights: • Microstructure and microchemistry at the SCC tips of Ni-based weld alloys 52, 52M and 152 were examined. • The crack densities, lengths and distributions were found to be different for different alloys. • IGSCC and TGSCC were observed on alloy 52, only TGSCC was observed on alloy 52M and 152. • The cracks were filled by Ni-oxides and precipitated CrCs, NbCs, TiNs and SiCs.
- OSTI ID:
- 22587095
- Journal Information:
- Materials Characterization, Vol. 112; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
77 NANOSCIENCE AND NANOTECHNOLOGY
CRACKING
ELECTRON DIFFRACTION
MICROSTRUCTURE
NICKEL ALLOYS
NICKEL OXIDES
NIOBIUM CARBIDES
NUCLEAR POWER PLANTS
PRECIPITATION
SCANNING ELECTRON MICROSCOPY
SILICON CARBIDES
STRESS CORROSION
TRANSMISSION ELECTRON MICROSCOPY
WATER COOLED REACTORS
WATER MODERATED REACTORS
WELDED JOINTS
X-RAY SPECTROSCOPY