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Stress corrosion crack tip microstructure in nickel-based alloys

Technical Report ·
DOI:https://doi.org/10.2172/10166874· OSTI ID:10166874
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Stress corrosion cracking behavior of several nickel-base alloys in high temperature caustic environments has been evaluated. The crack tip and fracture surfaces were examined using Auger/ESCA and Analytical Electron Microscopy (AEM) to determine the near crack tip microstructure and microchemistry. Results showed formation of chromium-rich oxides at or near the crack tip and nickel-rich de-alloying layers away from the crack tip. The stress corrosion resistance of different nickel-base alloys in caustic may be explained by the preferential oxidation and dissolution of different alloying elements at the crack tip. Alloy 600 (UNS N06600) shows good general corrosion and intergranular attack resistance in caustic because of its high nickel content. Thermally treated Alloy 690 (UNS N06690) and Alloy 600 provide good stress corrosion cracking resistance because of high chromium contents along grain boundaries. Alloy 625 (UNS N06625) does not show as good stress corrosion cracking resistance as Alloy 690 or Alloy 600 because of its high molybdenum content.
Research Organization:
Knolls Atomic Power Lab., Schenectady, NY (United States)
Sponsoring Organization:
USDOE, Washington, DC (United States)
DOE Contract Number:
AC12-76SN00052
OSTI ID:
10166874
Report Number(s):
KAPL--4763; CONF-940222--17; ON: DE94015362
Country of Publication:
United States
Language:
English

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Related Subjects

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
210100
210200
36 MATERIALS SCIENCE
360100
CHROMIUM OXIDES
CORROSION RESISTANCE
CORROSION RESISTANT ALLOYS
CRACK PROPAGATION
EXPERIMENTAL DATA
INCONEL 600
INCONEL 625
INCONEL 690
METALS AND ALLOYS
MICROSTRUCTURE
NUCLEAR POWER PLANTS
POWER REACTORS
NONBREEDING
LIGHT-WATER MODERATED
BOILING WATER COOLED
POWER REACTORS
NONBREEDING
LIGHT-WATER MODERATED
NONBOILING WATER COOLED
STRESS CORROSION