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Title: In situ SEM-EBSD analysis of plastic deformation mechanisms in neutron-irradiated austenitic steel

Abstract

In this study, in situ tensile tests, accompanied by scanning electron microscopy coupled with electron backscatter diffraction (EBSD) analyses were performed on neutron-irradiated 304L steel specimens (5.9 dpa, irradiation in boiling water reactor at 288 °C). Selected regions of interest were analyzed following tensile deformation of the specimens to increasing levels of strain, allowing for tracking and investigating strain-induced misorientation evolution, lattice rotation, twinning, and phase instability. Deformation-induced changes in EBSD misorientation parameters, such as kernel average misorientation (KAM) and grain reference orientation deviation (GROD), were analyzed as a function of the strain level (ε). Lastly, the mapping of GROD values revealed the formation of specific “hot spots” (areas with high local misorientation) in the early stages of tensile deformation (ε ~0–0.02) with values increasing much more quickly for irradiated specimens than for nonirradiated specimens. In contrast, average KAM values showed very little change in the small strain range (ε < 0.02) and fast growth at larger strain values.

Authors:
 [1];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1502540
Alternate Identifier(s):
OSTI ID: 1643156
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 517; Journal Issue: C; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Gussev, M. N., and Leonard, K. J. In situ SEM-EBSD analysis of plastic deformation mechanisms in neutron-irradiated austenitic steel. United States: N. p., 2019. Web. doi:10.1016/j.jnucmat.2019.01.034.
Gussev, M. N., & Leonard, K. J. In situ SEM-EBSD analysis of plastic deformation mechanisms in neutron-irradiated austenitic steel. United States. https://doi.org/10.1016/j.jnucmat.2019.01.034
Gussev, M. N., and Leonard, K. J. Wed . "In situ SEM-EBSD analysis of plastic deformation mechanisms in neutron-irradiated austenitic steel". United States. https://doi.org/10.1016/j.jnucmat.2019.01.034. https://www.osti.gov/servlets/purl/1502540.
@article{osti_1502540,
title = {In situ SEM-EBSD analysis of plastic deformation mechanisms in neutron-irradiated austenitic steel},
author = {Gussev, M. N. and Leonard, K. J.},
abstractNote = {In this study, in situ tensile tests, accompanied by scanning electron microscopy coupled with electron backscatter diffraction (EBSD) analyses were performed on neutron-irradiated 304L steel specimens (5.9 dpa, irradiation in boiling water reactor at 288 °C). Selected regions of interest were analyzed following tensile deformation of the specimens to increasing levels of strain, allowing for tracking and investigating strain-induced misorientation evolution, lattice rotation, twinning, and phase instability. Deformation-induced changes in EBSD misorientation parameters, such as kernel average misorientation (KAM) and grain reference orientation deviation (GROD), were analyzed as a function of the strain level (ε). Lastly, the mapping of GROD values revealed the formation of specific “hot spots” (areas with high local misorientation) in the early stages of tensile deformation (ε ~0–0.02) with values increasing much more quickly for irradiated specimens than for nonirradiated specimens. In contrast, average KAM values showed very little change in the small strain range (ε < 0.02) and fast growth at larger strain values.},
doi = {10.1016/j.jnucmat.2019.01.034},
journal = {Journal of Nuclear Materials},
number = C,
volume = 517,
place = {United States},
year = {Wed Jan 23 00:00:00 EST 2019},
month = {Wed Jan 23 00:00:00 EST 2019}
}

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Cited by: 62 works
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Works referencing / citing this record:

The origin of high-density dislocations in additively manufactured metals
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The origin of high-density dislocations in additively manufactured metals
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