Beam current effect as a potential challenge in SEM-EBSD in situ tensile testing

M. N. Gussev; P. D. Edmondson; K. J. Leonard

doi:10.1016/j.matchar.2018.09.037

Beam current effect as a potential challenge in SEM-EBSD in situ tensile testing

M. N. Gussev, P. D. Edmondson, K. J. Leonard

Nuclear Fuel Element Performance

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

19 Scopus citations

Abstract

In situ mechanical tensile tests coupled with electron backscatter diffraction (EBSD) analysis were conducted using specimens of two 304L steels with ~8 and 10.4% Ni content, respectively. Twinning was observed in steel with 10.4% Ni content, whereas steel with 8% Ni content demonstrated martensitic transformation. Testing showed that the kinetics of martensitic transformation in steel with 8% Ni content was influenced by the electron beam current used during EBSD scans. Continuous scanning using 32 nA nominal beam current led to suppression of the phase instability in the near-surface layer, but acceptable comparable-to-the-bulk results were obtained using 8 nA beam current. The exact mechanism of the beam current role is unclear, but it appears to be neutral regarding Kernel Average Misorientation behavior and deformation-induced twinning.

Original language	English
Pages (from-to)	25-34
Number of pages	10
Journal	Materials Characterization
Volume	146
DOIs	https://doi.org/10.1016/j.matchar.2018.09.037
State	Published - Dec 2018

Funding

This manuscript has been authored by UT-Battelle, LLC, under contract 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 ). This research was sponsored by the US Department of Energy, Office of Nuclear Energy , Light Water Reactor Sustainability (LWRS) Program. The tensile frame purchasing was a cooperative effort of several research and development programs and projects of Oak Ridge National Laboratory (ORNL): LWRS (project manager: Dr. K. Leonard), Accident-Tolerant Fuels (project manager: Dr. K. Terrani), and others; the contribution of the programs and continuous help and support from their managers are acknowledged and greatly appreciated. The authors would like to thank Dr. C. Parish (ORNL) for discussing the results and providing fruitful comments and L. Varma (ORNL) for valuable help with document preparation. This research was sponsored by the US Department of Energy, Office of Nuclear Energy, Light Water Reactor Sustainability (LWRS) Program. The tensile frame purchasing was a cooperative effort of several research and development programs and projects of Oak Ridge National Laboratory (ORNL): LWRS (project manager: Dr. K. Leonard), Accident-Tolerant Fuels (project manager: Dr. K. Terrani), and others; the contribution of the programs and continuous help and support from their managers are acknowledged and greatly appreciated. The authors would like to thank Dr. C. Parish (ORNL) for discussing the results and providing fruitful comments and L. Varma (ORNL) for valuable help with document preparation.

Funders	Funder number
LWRS
Office of Nuclear Energy , Light Water Reactor Sustainability
US Department of Energy
U.S. Department of Energy
Office of Nuclear Energy

Keywords

Austenitic metastable steels
EBSD
In situ testing
Phase transformation
Twinning

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10.1016/j.matchar.2018.09.037

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title = "Beam current effect as a potential challenge in SEM-EBSD in situ tensile testing",

abstract = "In situ mechanical tensile tests coupled with electron backscatter diffraction (EBSD) analysis were conducted using specimens of two 304L steels with ~8 and 10.4% Ni content, respectively. Twinning was observed in steel with 10.4% Ni content, whereas steel with 8% Ni content demonstrated martensitic transformation. Testing showed that the kinetics of martensitic transformation in steel with 8% Ni content was influenced by the electron beam current used during EBSD scans. Continuous scanning using 32 nA nominal beam current led to suppression of the phase instability in the near-surface layer, but acceptable comparable-to-the-bulk results were obtained using 8 nA beam current. The exact mechanism of the beam current role is unclear, but it appears to be neutral regarding Kernel Average Misorientation behavior and deformation-induced twinning.",

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AU - Edmondson, P. D.

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Beam current effect as a potential challenge in SEM-EBSD in situ tensile testing

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Keywords

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