Stress corrosion cracking of alloy 600 using the constant strain rate test

Conference · Tue Jan 01 04:00:00 EST 1980

OSTI ID:5266008

Bulischeck, T. S.; van Rooyen, D.

The most recent corrosion problems experienced in nuclear steam generators tubed with Inconel alloy 600 is a phenomenon labeled ''denting''. Denting has been found in various degrees of severity in many operating pressurized water reactors. Laboratory investigations have shown that Inconel 600 exhibits intergranular SCC when subjected to high stresses and exposed to deoxygenated water at elevated temperatures. A research project was initiated at Brookhaven National Laboratory in an attempt to improve the qualitative and quantitative understanding of factors influencing SCC in high temperature service-related environments. An effort is also being made to develop an accelerated test method which could be used to predict the service life of tubes which have been deformed or are actively denting. Several heats of commercial Inconel 600 tubing were procured for testing in deaerated pure and primary water at temperatures from 290 to 365/sup 0/C. U-bend type specimens were used to determine crack initiation times which may be expected for tubes where denting has occurred but is arrested and provide baseline data for judging the accelerating effects of the slow strain rate method. Constant extension rate tests were employed to determine the crack velocities experienced in the crack propagation stage and predict failure times of tubes which are actively denting. 8 refs., 17 figs., 5 tabs.

• Research Organization: Brookhaven National Lab., Upton, NY (USA)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5266008
• Report Number(s): BNL-NUREG--27759; CONF-800305--8; ON: TI86000101
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103 -- Metals & Alloys-- Mechanical Properties
360105* -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
BOILERS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CORROSION
CORROSION DENTING
DATA
DEFORMATION
EXPERIMENTAL DATA
INCONEL 600
INCONEL ALLOYS
INFORMATION
INTERGRANULAR CORROSION
IRON ALLOYS
MECHANICAL PROPERTIES
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIOBIUM ALLOYS
NUMERICAL DATA
PWR TYPE REACTORS
REACTORS
STEAM GENERATORS
STRESS CORROSION
TUBES
ULTIMATE STRENGTH
VAPOR GENERATORS
WATER COOLED REACTORS
WATER MODERATED REACTORS
YIELD STRENGTH