Deformation localization and dislocation channel dynamics in neutron-irradiated austenitic stainless steels

Gussev, Maxim N.; Field, Kevin G.; Busby, Jeremy T.

doi:10.1016/j.jnucmat.2015.02.008

Title: Deformation localization and dislocation channel dynamics in neutron-irradiated austenitic stainless steels

Journal Article · Tue Feb 24 00:00:00 EST 2015 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2015.02.008· OSTI ID:1185710

Gussev, Maxim N. ^[1]; Field, Kevin G. ^[1]; Busby, Jeremy T. ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

We investigated dynamics of deformation localization and dislocation channel formation in situ in a neutron irradiated AISI 304 austenitic stainless steel and a model 304-based austenitic alloy by combining several analytical techniques including optic microscopy and laser confocal microscopy, scanning electron microscopy, electron backscatter diffraction and transmission electron microscopy. Channel formation was observed at 70% of the formal tensile yield stress for both alloys. It was shown that triple junction points do not always serve as a source of dislocation channels; at stress levels below the yield stress, channels often formed near the middle of the grain boundary. For a single grain, the role of elastic stiffness value (Young modulus) in the channel formation was analyzed; it was shown that in the irradiated 304 steels the initial channels appeared in soft grains with a high Schmid factor located near stiff grains with high elastic stiffness. Moreover, the spatial organization of channels in a single grain was analyzed; it was shown that secondary channels operating in the same slip plane as primary channels often appeared at the middle or at one third of the way between primary channels. The twinning nature of dislocation channels was analyzed for grains of different orientation using TEM. Finally, it was shown that in the AISI 304 steel, channels were twin-free in grains oriented close to [001] and [101] of standard unit triangle; [111]-grains and grains oriented close to Schmid factor maximum contained deformation twins.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1185710

Alternate ID(s):: OSTI ID: 1252360

Journal Information:: Journal of Nuclear Materials, Vol. 460, Issue C; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 39 works

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36 MATERIALS SCIENCE
deformation localization
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Title: Deformation localization and dislocation channel dynamics in neutron-irradiated austenitic stainless steels

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