Orientation-dependent evolution of the dislocation density in grain populations with different crystallographic orientations relative to the tensile axis in a polycrystalline aggregate of stainless steel

T. Ungár, Alexandru D. Stoica, G. Tichy, Xun Li Wang

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

Line profile analysis was carried out on neutron diffraction patterns collected by the energy-dispersive method for an in situ tensile-deformed AISI-316 stainless steel specimen. The experiments were carried out at the VULCAN engineering beam line of the spallation neutron source of the Oak Ridge National Laboratory. Both the dislocation densities and the local stresses in grains oriented with different h k l crystal directions along the tensile axis were determined. The work-hardening equation of Taylor was tested for the h k l-dependent phenomenological constant α. The grain-orientation-dependent α values were directly related to the heterogeneity of dislocation distribution in correlation with previous transmission electron microscopy data.

Original languageEnglish
Pages (from-to)251-261
Number of pages11
JournalActa Materialia
Volume66
DOIs
Publication statusPublished - Mar 2014

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Stainless Steel
Stainless steel
Neutron sources
Neutron diffraction
Strain hardening
Diffraction patterns
Transmission electron microscopy
Crystals
Experiments
Direction compound

Keywords

  • h k l-Dependent dislocation density
  • In situ neutron diffraction
  • Line-profile analysis
  • Taylor equation
  • Work-hardening

ASJC Scopus subject areas

  • Ceramics and Composites
  • Metals and Alloys
  • Polymers and Plastics
  • Electronic, Optical and Magnetic Materials

Cite this

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abstract = "Line profile analysis was carried out on neutron diffraction patterns collected by the energy-dispersive method for an in situ tensile-deformed AISI-316 stainless steel specimen. The experiments were carried out at the VULCAN engineering beam line of the spallation neutron source of the Oak Ridge National Laboratory. Both the dislocation densities and the local stresses in grains oriented with different h k l crystal directions along the tensile axis were determined. The work-hardening equation of Taylor was tested for the h k l-dependent phenomenological constant α. The grain-orientation-dependent α values were directly related to the heterogeneity of dislocation distribution in correlation with previous transmission electron microscopy data.",
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T1 - Orientation-dependent evolution of the dislocation density in grain populations with different crystallographic orientations relative to the tensile axis in a polycrystalline aggregate of stainless steel

AU - Ungár, T.

AU - Stoica, Alexandru D.

AU - Tichy, G.

AU - Wang, Xun Li

PY - 2014/3

Y1 - 2014/3

N2 - Line profile analysis was carried out on neutron diffraction patterns collected by the energy-dispersive method for an in situ tensile-deformed AISI-316 stainless steel specimen. The experiments were carried out at the VULCAN engineering beam line of the spallation neutron source of the Oak Ridge National Laboratory. Both the dislocation densities and the local stresses in grains oriented with different h k l crystal directions along the tensile axis were determined. The work-hardening equation of Taylor was tested for the h k l-dependent phenomenological constant α. The grain-orientation-dependent α values were directly related to the heterogeneity of dislocation distribution in correlation with previous transmission electron microscopy data.

AB - Line profile analysis was carried out on neutron diffraction patterns collected by the energy-dispersive method for an in situ tensile-deformed AISI-316 stainless steel specimen. The experiments were carried out at the VULCAN engineering beam line of the spallation neutron source of the Oak Ridge National Laboratory. Both the dislocation densities and the local stresses in grains oriented with different h k l crystal directions along the tensile axis were determined. The work-hardening equation of Taylor was tested for the h k l-dependent phenomenological constant α. The grain-orientation-dependent α values were directly related to the heterogeneity of dislocation distribution in correlation with previous transmission electron microscopy data.

KW - h k l-Dependent dislocation density

KW - In situ neutron diffraction

KW - Line-profile analysis

KW - Taylor equation

KW - Work-hardening

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