Triple Ion-Beam Studies of Radiation Damage Effects in a 316LN Austenitic Alloy for a High Power Spallation Neutron Source Metadata

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Title

  • Main Title Triple Ion-Beam Studies of Radiation Damage Effects in a 316LN Austenitic Alloy for a High Power Spallation Neutron Source

Creator

  • Author: Lee, EH
    Creator Type: Personal

Contributor

  • Sponsor: United States. Department of Energy.
    Contributor Type: Organization
    Contributor Info: US Department of Energy (United States)

Publisher

  • Name: Oak Ridge National Laboratory
    Place of Publication: United States
    Additional Info: ORNL Oak Ridge National Laboratory (United States)

Date

  • Creation: 2001-08-01

Language

  • English

Description

  • Content Description: Austenitic 316LN alloy was ion-irradiated using the unique Triple Ion Beam Facility (TIF) at ORNL to investigate radiation damage effects relevant to spallation neutron sources. The TIF was used to simulate significant features of GeV proton irradiation effects in spallation neutron source target materials by producing displacement damage while simultaneously injecting helium and hydrogen at appropriately high gas/dpa ratios. Irradiations were carried out at 80, 200, and 350 C using 3.5 MeV Fe{sup 2}, 360 keV He{sup +}, and 180 keV H{sup +} to accumulate 50 dpa by Fe, 10,000 appm of He, and 50,000 appm of H. Irradiations were also carried out at 200 C in single and dual ion beam modes. The specific ion energies were chosen to maximize the damage and the gas accumulation at a depth of {approx} 1 {micro}m. Variations in microstructure and hardness of irradiated specimens were studied using transmission electron microscopy (TEM) and a nanoindentation technique, respectively. TEM investigation yielded varying damage defect microstructures, comprising black dots, faulted and unfaulted loops, and a high number density of fine bubbles (typically less than 1 nm in diameter). With increasing temperature, faulted loops had a tendency to unfault, and bubble microstructure changed from a bimodal size distribution to a unimodal distribution. Triple ion irradiations at the three temperatures resulted in similar increases in hardness of approximately a factor of two. Individually, Fe and He ions resulted in a similar magnitude of hardness increase, whereas H ions showed only a very small effect. The present study has yielded microstructural information relevant to spallation neutron source conditions and indicates that the most important concern may be radiation induced hardening and associated ductility loss.
  • Physical Description: vp.

Subject

  • Keyword: Protons
  • Keyword: Alloys
  • Keyword: Irradiation
  • STI Subject Categories: 08 Hydrogen
  • STI Subject Categories: 43 Particle Accelerators
  • Keyword: Ion Beams
  • Keyword: Spallation
  • Keyword: Hydrogen
  • Keyword: Transmission Electron Microscopy
  • Keyword: Neutron Sources
  • Keyword: Microstructure
  • Keyword: Radiations
  • Keyword: Defects
  • Keyword: Distribution
  • Keyword: Helium
  • Keyword: Hardness

Source

  • Other Information: PBD: 1 Aug 2001

Collection

  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI

Institution

  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Report

Format

  • Text

Identifier

  • Report No.: R01-111483
  • Grant Number: AC05-00OR22725
  • DOI: 10.2172/814451
  • Office of Scientific & Technical Information Report Number: 814451
  • Archival Resource Key: ark:/67531/metadc739144
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