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- W2046388640 abstract "Intergranular (IG) attack regions and stress corrosion cracks in Alloy 600 (UNS N06600) U-bend samples tested in 330°C pressurized water reactor water were characterized by analytical transmission electron microscopy (ATEM). Observations of cross-sectioned samples revealed short, oxidized zones preceding crack tips and narrow (∼ 40 nm wide), deeply penetrated, oxidized zones along grain boundaries exposed along open cracks. High-resolution imaging and fine-probe analysis were used to determine local chemistries and structures in these corrosion-affected zones. Matrix areas surrounding the crack tips appeared highly strained, whereas IG penetrations generally did not. The predominant oxide structure found along crack walls and just ahead of crack tips was NiO with metal-atom ratios similar to the alloy. The attacked grain boundaries off open cracks contained similar, fine-grained, NiO-structure oxide with local areas of Cr-rich oxide and Ni-rich metal. In contrast, Cr-rich oxide identified as Cr2O3 predominated at the leading edges of the IG attack. Stereoscopic imaging of these tip structures revealed nanometer-scale porosity and tunnels within the oxide and pores along the grain boundary plane ahead of the oxide. The general interpretation of these results was that IG attack and cracking followed local dissolution or oxidation and the formation of pores at grain boundaries. This degradation occurred at the nanometer scale and therefore required high-resolution ATEM methods to reveal detailed characteristics. Experimental support for several possible IG degradation mechanisms was considered." @default.
- W2046388640 created "2016-06-24" @default.
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- W2046388640 date "2000-06-01" @default.
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- W2046388640 title "High-Resolution Characterization of Intergranular Attack and Stress Corrosion Cracking of Alloy 600 in High-Temperature Primary Water" @default.
- W2046388640 doi "https://doi.org/10.5006/1.3280561" @default.
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