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

M. N. Gussev; K. J. Leonard

doi:10.1016/j.jnucmat.2019.01.034

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

M. N. Gussev, K. J. Leonard

Advanced Fuel Fabrication and Instrument

Research output: Contribution to journal › Article › peer-review

122 Scopus citations

Abstract

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). 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.

Original language	English
Pages (from-to)	45-56
Number of pages	12
Journal	Journal of Nuclear Materials
Volume	517
DOIs	https://doi.org/10.1016/j.jnucmat.2019.01.034
State	Published - Apr 15 2019

Funding

The research was supported by the U.S. Department of Energy , Office of Nuclear Energy, for the Light Water Reactor Sustainability Program research and development effort. Irradiated specimen manufacturing and in situ SEM-EBSD mechanical testing were performed at ORNL's LAMDA laboratory; help and support of the LAMDA management and technical staff are greatly appreciated. The authors would like to thank Dr. P. Edmondson (ORNL) for help with developing and establishing the in situ testing approach at LAMDA, Dr. K.G. Field and Dr. A. Nelson (ORNL) for reviewing the paper and valuable discussions, B. Eckhart and T. Dixon (ORNL) for help with specimen manufacturing, and W. Koncinski (ORNL) for help with manuscript preparation.

Keywords

Grain reference orientation deviation (GROD)
In situ tensile testing
Irradiated austenitic steels
Kernel average misorientation (KAM)
Localized deformation

Access to Document

10.1016/j.jnucmat.2019.01.034

Cite this

@article{e2146224167d4615bd3435011ac482c7,

title = "In situ SEM-EBSD analysis of plastic deformation mechanisms in neutron-irradiated austenitic steel",

abstract = "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). 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.",

keywords = "Grain reference orientation deviation (GROD), In situ tensile testing, Irradiated austenitic steels, Kernel average misorientation (KAM), Localized deformation",

author = "Gussev, {M. N.} and Leonard, {K. J.}",

note = "Publisher Copyright: {\textcopyright} 2019 Elsevier B.V.",

year = "2019",

month = apr,

day = "15",

doi = "10.1016/j.jnucmat.2019.01.034",

language = "English",

volume = "517",

pages = "45--56",

journal = "Journal of Nuclear Materials",

issn = "0022-3115",

publisher = "Elsevier",

}

TY - JOUR

T1 - In situ SEM-EBSD analysis of plastic deformation mechanisms in neutron-irradiated austenitic steel

AU - Gussev, M. N.

AU - Leonard, K. J.

PY - 2019/4/15

Y1 - 2019/4/15

N2 - 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). 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.

AB - 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). 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.

KW - Grain reference orientation deviation (GROD)

KW - In situ tensile testing

KW - Irradiated austenitic steels

KW - Kernel average misorientation (KAM)

KW - Localized deformation

UR - http://www.scopus.com/inward/record.url?scp=85061095692&partnerID=8YFLogxK

U2 - 10.1016/j.jnucmat.2019.01.034

DO - 10.1016/j.jnucmat.2019.01.034

M3 - Article

AN - SCOPUS:85061095692

SN - 0022-3115

VL - 517

SP - 45

EP - 56

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

ER -

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

Abstract

Funding

Keywords

Access to Document

Other files and links

Fingerprint

Cite this