Probing the Damage Recovery Mechanism in Irradiated Stainless Steels Using In-Situ Microcantilever Bending Test

Keyou S. Mao; Hao Wang; Haozheng J. Qu; Kayla H. Yano; Philip D. Edmondson; Cheng Sun; Janelle P. Wharry

doi:10.3389/fmats.2022.823192

Probing the Damage Recovery Mechanism in Irradiated Stainless Steels Using In-Situ Microcantilever Bending Test

Keyou S. Mao, Hao Wang, Haozheng J. Qu, Kayla H. Yano, Philip D. Edmondson, Cheng Sun, Janelle P. Wharry

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

Abstract

Single crystalline microcantilevers are fabricated from the base metal and heat-affected zone (HAZ) of a laser welded, neutron irradiated austenitic stainless steel, for scanning electron microscope (SEM) in-situ bending. In the HAZ, cantilevers exhibit higher yield point and lower crack tip blunting displacement than in the base metal and unirradiated archive specimen. These results suggest that radiation-induced defects harden the base metal, whereas the HAZ exhibits annealing of defects leading to mechanical softening. Dislocation nucleation ahead of the crack tip is responsible for ductile blunting behavior and provides a pathway to mitigating helium-induced cracking during weld repairs of irradiated materials.

Original language	English (US)
Article number	823192
Journal	Frontiers in Materials
Volume	9
DOIs	https://doi.org/10.3389/fmats.2022.823192
State	Published - Feb 14 2022
Externally published	Yes

Keywords

crack
helium
irradiation
laser weld
microcantilever

ASJC Scopus subject areas

Materials Science (miscellaneous)

Online availability

10.3389/fmats.2022.823192

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title = "Probing the Damage Recovery Mechanism in Irradiated Stainless Steels Using In-Situ Microcantilever Bending Test",

abstract = "Single crystalline microcantilevers are fabricated from the base metal and heat-affected zone (HAZ) of a laser welded, neutron irradiated austenitic stainless steel, for scanning electron microscope (SEM) in-situ bending. In the HAZ, cantilevers exhibit higher yield point and lower crack tip blunting displacement than in the base metal and unirradiated archive specimen. These results suggest that radiation-induced defects harden the base metal, whereas the HAZ exhibits annealing of defects leading to mechanical softening. Dislocation nucleation ahead of the crack tip is responsible for ductile blunting behavior and provides a pathway to mitigating helium-induced cracking during weld repairs of irradiated materials.",

keywords = "crack, helium, irradiation, laser weld, microcantilever",

author = "Mao, {Keyou S.} and Hao Wang and Qu, {Haozheng J.} and Yano, {Kayla H.} and Edmondson, {Philip D.} and Cheng Sun and Wharry, {Janelle P.}",

note = "This work was supported by the Idaho National Laboratory Directed Research and Development (LDRD) Program under U.S. Department of Energy (DOE) Idaho Operations Office Contract DE-AC07-051D14517. This work was also supported by U.S. Department of Energy, Light-Water Reactor Sustainability Program of the Office of Nuclear Energy, under contract number DE-AC-05-00OR22725. Specimens were generated through support from the U.S. DOE Office of Nuclear Energy contract DE-NE0008525 with complementary Nuclear Science User Facilities (NSUF) access. This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE).",

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doi = "10.3389/fmats.2022.823192",

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T1 - Probing the Damage Recovery Mechanism in Irradiated Stainless Steels Using In-Situ Microcantilever Bending Test

AU - Mao, Keyou S.

AU - Wang, Hao

AU - Qu, Haozheng J.

AU - Yano, Kayla H.

AU - Edmondson, Philip D.

AU - Sun, Cheng

AU - Wharry, Janelle P.

N1 - This work was supported by the Idaho National Laboratory Directed Research and Development (LDRD) Program under U.S. Department of Energy (DOE) Idaho Operations Office Contract DE-AC07-051D14517. This work was also supported by U.S. Department of Energy, Light-Water Reactor Sustainability Program of the Office of Nuclear Energy, under contract number DE-AC-05-00OR22725. Specimens were generated through support from the U.S. DOE Office of Nuclear Energy contract DE-NE0008525 with complementary Nuclear Science User Facilities (NSUF) access. This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE).

PY - 2022/2/14

Y1 - 2022/2/14

N2 - Single crystalline microcantilevers are fabricated from the base metal and heat-affected zone (HAZ) of a laser welded, neutron irradiated austenitic stainless steel, for scanning electron microscope (SEM) in-situ bending. In the HAZ, cantilevers exhibit higher yield point and lower crack tip blunting displacement than in the base metal and unirradiated archive specimen. These results suggest that radiation-induced defects harden the base metal, whereas the HAZ exhibits annealing of defects leading to mechanical softening. Dislocation nucleation ahead of the crack tip is responsible for ductile blunting behavior and provides a pathway to mitigating helium-induced cracking during weld repairs of irradiated materials.

AB - Single crystalline microcantilevers are fabricated from the base metal and heat-affected zone (HAZ) of a laser welded, neutron irradiated austenitic stainless steel, for scanning electron microscope (SEM) in-situ bending. In the HAZ, cantilevers exhibit higher yield point and lower crack tip blunting displacement than in the base metal and unirradiated archive specimen. These results suggest that radiation-induced defects harden the base metal, whereas the HAZ exhibits annealing of defects leading to mechanical softening. Dislocation nucleation ahead of the crack tip is responsible for ductile blunting behavior and provides a pathway to mitigating helium-induced cracking during weld repairs of irradiated materials.

KW - crack

KW - helium

KW - irradiation

KW - laser weld

KW - microcantilever

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Probing the Damage Recovery Mechanism in Irradiated Stainless Steels Using In-Situ Microcantilever Bending Test

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