Published April 1994 | Version v1
Report Open

Stress corrosion crack tip microstructure in nickel-based alloys

Creators

Description

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

Availability note (English)

MF available from INIS under the Report Number; Also available from OSTI as DE94015362; NTIS; US Govt. Printing Office Dep.

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Additional details

Publishing Information

Imprint Pagination
28 p.
Report number
KAPL--4763

Conference

Title
National Association of Corrosion Engineers (NACE) international annual conference.
Acronym
Corrosion 94
Dates
28 Feb - 4 Mar 1994.
Place
Baltimore, MD (United States).

INIS

Country of Publication
United States
Country of Input or Organization
United States
INIS RN
26000314
Subject category
S36: MATERIALS SCIENCE; S21: SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; S21: SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS;
Resource subtype / Literary indicator
Conference, Numerical Data
Descriptors DEI
CHROMIUM OXIDES; CORROSION RESISTANCE; CORROSION RESISTANT ALLOYS; CRACK PROPAGATION; EXPERIMENTAL DATA; INCONEL 600; INCONEL 625; INCONEL 690; MICROSTRUCTURE; NUCLEAR POWER PLANTS; STRESS CORROSION
Descriptors DEC
ALLOY-NI59CR30FE9; ALLOY-NI61CR22MO9NB4FE3; ALLOY-NI76CR15FE8; ALLOYS; ALUMINIUM ADDITIONS; CHALCOGENIDES; CHEMICAL REACTIONS; CHROMIUM ALLOYS; CHROMIUM COMPOUNDS; CORROSION; CRYSTAL STRUCTURE; DATA; HEAT RESISTANT MATERIALS; HEAT RESISTING ALLOYS; INCONEL ALLOYS; INFORMATION; IRON ALLOYS; MATERIALS; MOLYBDENUM ALLOYS; NICKEL ALLOYS; NICKEL BASE ALLOYS; NIMONIC; NIOBIUM ALLOYS; NUCLEAR FACILITIES; NUMERICAL DATA; OXIDES; OXYGEN COMPOUNDS; POWER PLANTS; THERMAL POWER PLANTS; TITANIUM ADDITIONS; TRANSITION ELEMENT COMPOUNDS

Optional Information

Contract/Grant/Project number
Contract AC12-76SN00052
Funding organization
USDOE, Washington, DC (United States).
Secondary number(s)
CONF-940222--17.