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JAEA Fatigue Analysis of EBR-II Duplex Tubing.

DE2009966150

Publication Date	2009
Personal Author	Jackson, J. H.; Porter, D. L.; Lloyd, W. R.
Page Count	19
Abstract	This work addresses questions brought up concerning the mechanisms associated with fatigue crack growth retardation and/or arrest within the nickel bond layer in duplex 2 and one fourth Cr-1Mo steel superheater tubes. Previous work performed at the Idaho National Laboratory (INL) indicated that the nickel bond layer did not function as a crack arrestor during fatigue crack propagation with the exception of one, isolated case involving an exceptionally low fatigue load and a high temperature (400 degrees C) environment. Since it is atypical for a fatigue crack to propagate from a relatively soft material (the nickel bond layer) to a harder material (the 2 and one fourth Cr-1Mo steel) there has been speculation that the nickel bond layer was hardened in service. Additionally, there are questions surrounding the nature of the fatigue crack propagation within the nickel bond layer; specifically with regard to the presence of voids seen on micrographs of the bond layer and oxidation within the steel along the edge of the nickel bond layer. There is uncertainty as to the effect of these voids and/or oxide barriers with respect to potential fatigue crack arrest.
Keywords	Tubes Fatigue cracks Nickel bond layers Voids Oxide barriers Testing procedures Fractography Microscopy Fatigue testing Nickel interlayers Fatigue crack growth retardation Steel superheater tubes Micro-hardness testing Japanese Atomic Energy Agency (JAEA)
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Idaho National Laboratory, Idaho Falls, ID.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	201009
Contract Number	DE-AC07-05ID145

JAEA Fatigue Analysis of EBR-II Duplex Tubing.

JAEA Fatigue Analysis of EBR-II Duplex Tubing.
DE2009966150

Publication Date	2009
Personal Author	Jackson, J. H.; Porter, D. L.; Lloyd, W. R.
Page Count	19
Abstract	This work addresses questions brought up concerning the mechanisms associated with fatigue crack growth retardation and/or arrest within the nickel bond layer in duplex 2 and one fourth Cr-1Mo steel superheater tubes. Previous work performed at the Idaho National Laboratory (INL) indicated that the nickel bond layer did not function as a crack arrestor during fatigue crack propagation with the exception of one, isolated case involving an exceptionally low fatigue load and a high temperature (400 degrees C) environment. Since it is atypical for a fatigue crack to propagate from a relatively soft material (the nickel bond layer) to a harder material (the 2 and one fourth Cr-1Mo steel) there has been speculation that the nickel bond layer was hardened in service. Additionally, there are questions surrounding the nature of the fatigue crack propagation within the nickel bond layer; specifically with regard to the presence of voids seen on micrographs of the bond layer and oxidation within the steel along the edge of the nickel bond layer. There is uncertainty as to the effect of these voids and/or oxide barriers with respect to potential fatigue crack arrest.
Keywords	Tubes Fatigue cracks Nickel bond layers Voids Oxide barriers Testing procedures Fractography Microscopy Fatigue testing Nickel interlayers Fatigue crack growth retardation Steel superheater tubes Micro-hardness testing Japanese Atomic Energy Agency (JAEA)
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Idaho National Laboratory, Idaho Falls, ID.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	201009
Contract Number	DE-AC07-05ID145