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Susceptibility of Alloy 22 to Environmentally Assisted Cracking in Yucca Mountain Relevant Environments.

DE200415006870

Publication Date	2002
Personal Author	Estill, J. C.; King, K. J.; Fix, D. V.; Spurlock, D. G.; Hust, G. A.
Page Count	20
Abstract	In its current design, the high level nuclear waste containers will include an external layer of Alloy 22 (Ni-22Cr-13Mo-3W-3Fe). Since over their life-time the containers may be exposed to multi-ionic aqueous environments, a potential degradation mode of the outer layer could be environmental assisted cracking (EAC). The objective of the current research work was to quantify the susceptibility of Alloy 22 to EAC in a several environmental conditions including solution composition, temperature and electrochemical potential. The susceptibility to EAC was evaluated using the constant deformation technique, the compact specimen--low cycle fatigue method and the slow strain rate test (SSRT). The alloy was tested in the wrought mill annealed (MA) and in the as-welded conditions. Results show that Alloy 22 was extremely resistant to EAC in a wide range of environmental conditions. Using SSRT, Alloy 22 was found susceptible to EAC in one electrolyte at one temperature and at one electrochemical potential.
Keywords	Alloy 22 Susceptibility Cracking Radiation chemistry Radiochemistry Nuclear chemistry Alloys Containers Corrosion Deformation Environments Design Electrolytes Radioactive wastes Strain rate Yucca Mountain
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Lawrence Livermore National Lab., CA.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200418

Susceptibility of Alloy 22 to Environmentally Assisted Cracking in Yucca Mountain Relevant Environments.

Susceptibility of Alloy 22 to Environmentally Assisted Cracking in Yucca Mountain Relevant Environments.
DE200415006870

Publication Date	2002
Personal Author	Estill, J. C.; King, K. J.; Fix, D. V.; Spurlock, D. G.; Hust, G. A.
Page Count	20
Abstract	In its current design, the high level nuclear waste containers will include an external layer of Alloy 22 (Ni-22Cr-13Mo-3W-3Fe). Since over their life-time the containers may be exposed to multi-ionic aqueous environments, a potential degradation mode of the outer layer could be environmental assisted cracking (EAC). The objective of the current research work was to quantify the susceptibility of Alloy 22 to EAC in a several environmental conditions including solution composition, temperature and electrochemical potential. The susceptibility to EAC was evaluated using the constant deformation technique, the compact specimen--low cycle fatigue method and the slow strain rate test (SSRT). The alloy was tested in the wrought mill annealed (MA) and in the as-welded conditions. Results show that Alloy 22 was extremely resistant to EAC in a wide range of environmental conditions. Using SSRT, Alloy 22 was found susceptible to EAC in one electrolyte at one temperature and at one electrochemical potential.
Keywords	Alloy 22 Susceptibility Cracking Radiation chemistry Radiochemistry Nuclear chemistry Alloys Containers Corrosion Deformation Environments Design Electrolytes Radioactive wastes Strain rate Yucca Mountain
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Lawrence Livermore National Lab., CA.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200418