Server maintenance is scheduled for Saturday, December 21st between 6am-10am CST.

During that time, parts of our website will be affected until maintenance is completed. Thank you for your patience.

Menu
Search
Filters
Close
Menu

99443 STRESS CORROSION CRACKING OF AUSTENITIC STAINLESS STEEL CORE INTERNAL WELD

Picture for 99443 STRESS CORROSION CRACKING OF AUSTENITIC
Available for download
Product Number: 51300-99443-SG
ISBN: 99443 1999 CP
Author: H. M. Chung, J.-H. Park, W. E. Ruther, J. E. Sanecki, R.V. Strain, and N. J. Zaluzec
$0.00
$20.00
$20.00
Microstructural analyses by several advanced metallographic techniques were conducted on austenitic stainless steel mockup and core shroud welds that cracked in boiling water reactors. Contrary to previous beliefs, heat-affected zones of the cracked Type 304L as well as 304 SS core shroud welds and mockup shielded-metal-arc welds were free of grain-boundary carbides, which shows that core shroud failure cannot be explained by classical intergranular stress corrosion cracking. Neither martensite nor delta-ferrite films were present on grain boundaries. However, as a result of exposure to weld fumes, the heat-affected zones of the core shroud welds were significantly contaminated by oxygen and fluorine which migrate to grain boundaries. Significant oxygen contamination seems to promote fluorine contamination and suppress thermal sensitization. Results of slow-strain-rate tensile tests indicate also that fluorine exacerbate the susceptibility of irradiated steels to intergranular stress corrosion cracking. These observations, combined with previous reports on the strong influence of weld flux, indicate that oxygen and fluorine contamination and fluorine-catalyzed stress corrosion play a major role in cracking of core shroud welds. Key words: core shroud weld, intergranular stress corrosion cracking, weld flux, oxygen and fluorine contamination, grain-boundary Cr depletion
Microstructural analyses by several advanced metallographic techniques were conducted on austenitic stainless steel mockup and core shroud welds that cracked in boiling water reactors. Contrary to previous beliefs, heat-affected zones of the cracked Type 304L as well as 304 SS core shroud welds and mockup shielded-metal-arc welds were free of grain-boundary carbides, which shows that core shroud failure cannot be explained by classical intergranular stress corrosion cracking. Neither martensite nor delta-ferrite films were present on grain boundaries. However, as a result of exposure to weld fumes, the heat-affected zones of the core shroud welds were significantly contaminated by oxygen and fluorine which migrate to grain boundaries. Significant oxygen contamination seems to promote fluorine contamination and suppress thermal sensitization. Results of slow-strain-rate tensile tests indicate also that fluorine exacerbate the susceptibility of irradiated steels to intergranular stress corrosion cracking. These observations, combined with previous reports on the strong influence of weld flux, indicate that oxygen and fluorine contamination and fluorine-catalyzed stress corrosion play a major role in cracking of core shroud welds. Key words: core shroud weld, intergranular stress corrosion cracking, weld flux, oxygen and fluorine contamination, grain-boundary Cr depletion
PRICE BREAKS - The more you buy, the more you save
Quantity
1+
5+
Price
$20.00
$20.00
Product tags
Also Purchased
Picture for 99438 BWR INTERNALS CRACKING ISSUES
Available for download

99438 BWR INTERNALS CRACKING ISSUES

Product Number: 51300-99438-SG
ISBN: 99438 1999 CP
Author: C. E. Carpenter, Jr., A. Louise Lund
$20.00
Picture for 00186 STRAIN AND MICROSTRUCTURE CHARACTERIZATION
Available for download

00186 STRAIN AND MICROSTRUCTURE CHARACTERIZATION OF AUSTENITIC STAINLESS STEEL WELD HAZS

Product Number: 51300-00186-SG
ISBN: 00186 2000 CP
Author: T.M. Angeliu, P.L. Andresen, E. Hall, J.A. Sutliff, S. Sitzman
$20.00
Picture for 00467 HYDROGEN PERMEATION AND HYDROGEN
Available for download

00467 HYDROGEN PERMEATION AND HYDROGEN CONCENTRATION MEASUREMENTS TO MODEL DIFFUSIBLE HYDROGEN IN WELD METAL

Product Number: 51300-00467-SG
ISBN: 00467 2000 CP
Author: M. Castillo, C. E. Rogers, J. H. Payer, M. Quintana
$20.00
Categories
Industry
Recently viewed
Popular tags
View all

Association for Materials Protection and Performance

© AMPP All Rights Reserved.
Membership Terms of Content Use
Contact Customer Support