Origin, parameters, and underlying deformation mechanisms of propagating deformation bands in irradiated 316L stainless steel

M. N. Gussev; D. A. McClintock; T. G. Lach

doi:10.1016/j.actamat.2022.118434

Origin, parameters, and underlying deformation mechanisms of propagating deformation bands in irradiated 316L stainless steel

M. N. Gussev, D. A. McClintock, T. G. Lach

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

4 Scopus citations

Abstract

Lüders-type propagating deformation bands were observed in specimens of irradiated 316L stainless steel samples removed from Spallation Neutron Source target vessels after service. Mechanical testing with digital image correlation (DIC) and in-situ tensile testing with scanning electron microscopy electron backscatter diffraction showed that the observed Lüders-type behavior was not related to the known transformation-induced plasticity or twinning-induced plasticity behavior. Instead, the phenomenon occurs at small local strain values before a significant amount of martensite or deformation twins appear in the microstructure. Microstructural analysis and in-situ mechanical test results suggest Lüders-type band formation and propagation were related to the appearance and evolution of defect-free channels—analogous to slip bands. A modified Swift equation with a Ludwigson-like component was offered to rationalize the phenomenon and model the strain-softening processes at small strain values. The results indicate complex microstructural processes and deformation mechanisms were active at small strain values and underline the benefits of advanced mechanical test approaches such as DIC.

Original language	English
Article number	118434
Journal	Acta Materialia
Volume	242
DOIs	https://doi.org/10.1016/j.actamat.2022.118434
State	Published - Jan 1 2023

Bibliographical note

Publisher Copyright:
© 2022 Acta Materialia Inc.

Funding

This manuscript has been authored by UT-Battelle LLC under contract No. DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. The DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan ). The authors would like to thank Dr. T.S. Byun (ORNL) and Dr. J. Harp (ORNL) for fruitful, in-depth discussions and review of the work, and Dr. N. Bibhanshu for help with SEM-based microstructure analysis. The help and support of ORNL's Low-Activation Materials Design and Analysis Laboratory staff (P. Tedder, T. Dixon, S. Curlin) are gratefully acknowledged. The authors also would like to thank L. Varma (ORNL) for help with manuscript preparation. A portion of this research used resources at the SNS, a US Department of Energy Office of Science User Facility operated by ORNL. This manuscript has been authored by UT-Battelle LLC under contract No. DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. The DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan).

Funders	Funder number
DOE Public Access Plan
U.S. Department of Energy
Office of Science
Oak Ridge National Laboratory
UT-Battelle	DE-AC05-00OR22725

Keywords

Dislocation channeling
Irradiated 316L steel
Lüders-type deformation band
SEM-EBSD in-situ testing
Spallation Neutron Source

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10.1016/j.actamat.2022.118434

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title = "Origin, parameters, and underlying deformation mechanisms of propagating deformation bands in irradiated 316L stainless steel",

abstract = "L{\"u}ders-type propagating deformation bands were observed in specimens of irradiated 316L stainless steel samples removed from Spallation Neutron Source target vessels after service. Mechanical testing with digital image correlation (DIC) and in-situ tensile testing with scanning electron microscopy electron backscatter diffraction showed that the observed L{\"u}ders-type behavior was not related to the known transformation-induced plasticity or twinning-induced plasticity behavior. Instead, the phenomenon occurs at small local strain values before a significant amount of martensite or deformation twins appear in the microstructure. Microstructural analysis and in-situ mechanical test results suggest L{\"u}ders-type band formation and propagation were related to the appearance and evolution of defect-free channels—analogous to slip bands. A modified Swift equation with a Ludwigson-like component was offered to rationalize the phenomenon and model the strain-softening processes at small strain values. The results indicate complex microstructural processes and deformation mechanisms were active at small strain values and underline the benefits of advanced mechanical test approaches such as DIC.",

keywords = "Dislocation channeling, Irradiated 316L steel, L{\"u}ders-type deformation band, SEM-EBSD in-situ testing, Spallation Neutron Source",

author = "Gussev, {M. N.} and McClintock, {D. A.} and Lach, {T. G.}",

note = "Publisher Copyright: {\textcopyright} 2022 Acta Materialia Inc.",

year = "2023",

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doi = "10.1016/j.actamat.2022.118434",

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AU - Gussev, M. N.

AU - McClintock, D. A.

AU - Lach, T. G.

PY - 2023/1/1

Y1 - 2023/1/1

N2 - Lüders-type propagating deformation bands were observed in specimens of irradiated 316L stainless steel samples removed from Spallation Neutron Source target vessels after service. Mechanical testing with digital image correlation (DIC) and in-situ tensile testing with scanning electron microscopy electron backscatter diffraction showed that the observed Lüders-type behavior was not related to the known transformation-induced plasticity or twinning-induced plasticity behavior. Instead, the phenomenon occurs at small local strain values before a significant amount of martensite or deformation twins appear in the microstructure. Microstructural analysis and in-situ mechanical test results suggest Lüders-type band formation and propagation were related to the appearance and evolution of defect-free channels—analogous to slip bands. A modified Swift equation with a Ludwigson-like component was offered to rationalize the phenomenon and model the strain-softening processes at small strain values. The results indicate complex microstructural processes and deformation mechanisms were active at small strain values and underline the benefits of advanced mechanical test approaches such as DIC.

AB - Lüders-type propagating deformation bands were observed in specimens of irradiated 316L stainless steel samples removed from Spallation Neutron Source target vessels after service. Mechanical testing with digital image correlation (DIC) and in-situ tensile testing with scanning electron microscopy electron backscatter diffraction showed that the observed Lüders-type behavior was not related to the known transformation-induced plasticity or twinning-induced plasticity behavior. Instead, the phenomenon occurs at small local strain values before a significant amount of martensite or deformation twins appear in the microstructure. Microstructural analysis and in-situ mechanical test results suggest Lüders-type band formation and propagation were related to the appearance and evolution of defect-free channels—analogous to slip bands. A modified Swift equation with a Ludwigson-like component was offered to rationalize the phenomenon and model the strain-softening processes at small strain values. The results indicate complex microstructural processes and deformation mechanisms were active at small strain values and underline the benefits of advanced mechanical test approaches such as DIC.

KW - Dislocation channeling

KW - Irradiated 316L steel

KW - Lüders-type deformation band

KW - SEM-EBSD in-situ testing

KW - Spallation Neutron Source

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JO - Acta Materialia

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Origin, parameters, and underlying deformation mechanisms of propagating deformation bands in irradiated 316L stainless steel

Abstract

Bibliographical note

Funding

Keywords

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