Mapping Flow Localization Processes in Deformation of Irradiated Reactor Structural Alloys

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Metals that can sustain plastic deformation homogeneously throughout their bulk tend to be tough and malleable. Often, however, if a metal has been hardened it will no longer deform uniformly. Instead, the deformation occurs in narrow bands on a microscopic scale wherein stresses and strains become concentrated in localized zones. This strain localization degrades the mechanical properties of the metal by causing premature plastic instability failure or by inducing the formation of cracks. Irradiation with neutrons hardens a metal and makes it more prone to deformation by strain localization. Although this has been known since the earliest days of radiation ... continued below

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63 pages

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Farrell, K. July 18, 2002.

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Description

Metals that can sustain plastic deformation homogeneously throughout their bulk tend to be tough and malleable. Often, however, if a metal has been hardened it will no longer deform uniformly. Instead, the deformation occurs in narrow bands on a microscopic scale wherein stresses and strains become concentrated in localized zones. This strain localization degrades the mechanical properties of the metal by causing premature plastic instability failure or by inducing the formation of cracks. Irradiation with neutrons hardens a metal and makes it more prone to deformation by strain localization. Although this has been known since the earliest days of radiation damage studies, a full measure of the connection between neutron irradiation hardening and strain localization is wanting, particularly in commercial alloys used in the construction of nuclear reactors. Therefore, the goal of this project is to systematically map the extent of involvement of strain localization processes in plastic deformation of three reactor alloys that have been neutron irradiated. The deformation processes are to be identified and related to changes in the tensile properties of the alloys as functions of neutron fluence (dose) and degree of plastic strain. The intent is to define the role of strain localization in radiation embrittlement phenomena. The three test materials are a tempered bainitic A533B steel, representing reactor pressure vessel steel, an annealed 316 stainless steel and annealed Zircaloy-4 representing reactor internal components.

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63 pages

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  • Other Information: PBD: 18 Jul 2002

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  • Report No.: ORNL/TM-2002/66
  • Grant Number: AC05-00OR22725
  • DOI: 10.2172/814077 | External Link
  • Office of Scientific & Technical Information Report Number: 814077
  • Archival Resource Key: ark:/67531/metadc740461

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  • July 18, 2002

Added to The UNT Digital Library

  • Oct. 18, 2015, 6:40 p.m.

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  • March 31, 2016, 1:09 p.m.

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Farrell, K. Mapping Flow Localization Processes in Deformation of Irradiated Reactor Structural Alloys, report, July 18, 2002; United States. (digital.library.unt.edu/ark:/67531/metadc740461/: accessed November 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.