Tritium Effects on Fracture Toughness of Stainless Steel Weldments

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The effects of tritium on the fracture toughness properties of Type 304L and Type 21-6-9 stainless steel weldments were measured. Weldments were tritium-charged-and-aged and then tested in order to measure the effect of the increasing decay helium content on toughness. The results were compared to uncharged and hydrogen-charged samples. For unexposed weldments having 8-12 volume percent retained delta ferrite, fracture toughness was higher than base metal toughness. At higher levels of weld ferrite, the fracture toughness decreased to values below that of the base metal. Hydrogen-charged and tritium-charged weldments had lower toughness values than similarly charged base metals and toughness ... continued below

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MORGAN, MICHAEL; CHAPMAN, G. K.; TOSTEN, M. H. & WEST, S. L. May 12, 2005.

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The effects of tritium on the fracture toughness properties of Type 304L and Type 21-6-9 stainless steel weldments were measured. Weldments were tritium-charged-and-aged and then tested in order to measure the effect of the increasing decay helium content on toughness. The results were compared to uncharged and hydrogen-charged samples. For unexposed weldments having 8-12 volume percent retained delta ferrite, fracture toughness was higher than base metal toughness. At higher levels of weld ferrite, the fracture toughness decreased to values below that of the base metal. Hydrogen-charged and tritium-charged weldments had lower toughness values than similarly charged base metals and toughness decreased further with increasing weld ferrite content. The effect of decay helium content was inconclusive because of tritium off-gassing losses during handling, storage and testing. Fracture modes were dominated by the dimpled rupture process in unexposed weldments. In hydrogen and tritium-exposed weldments, the fracture modes depended on the weld ferrite content. At high ferrite contents, hydrogen-induced transgranular fracture of the weld ferrite phase was observed.

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  • Report No.: WSRC-MS-2004-00579
  • Grant Number: DE-AC09-96SR18500
  • Office of Scientific & Technical Information Report Number: 881343
  • Archival Resource Key: ark:/67531/metadc885529

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • May 12, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 7, 2016, 11:21 p.m.

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MORGAN, MICHAEL; CHAPMAN, G. K.; TOSTEN, M. H. & WEST, S. L. Tritium Effects on Fracture Toughness of Stainless Steel Weldments, article, May 12, 2005; Aiken, South Carolina. (digital.library.unt.edu/ark:/67531/metadc885529/: accessed December 14, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.