Segregation behavior and phase instability of Eurofer97 after neutron irradiation to 72 dpa

Kun Wang; Chad M. Parish; Kevin G. Field; Lizhen Tan; Yutai Katoh

doi:10.1016/j.jnucmat.2021.152834

Segregation behavior and phase instability of Eurofer97 after neutron irradiation to 72 dpa

Kun Wang, Chad M. Parish, Kevin G. Field, Lizhen Tan, Yutai Katoh

Oak Ridge National Laboratory

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

13 Scopus citations

Abstract

A reduced activation ferritic/martensitic steel, Eurofer97, was neutron irradiated in the vicinity of 300 °C in the High Flux Isotope Reactor (HFIR) up to 72 dpa. Advanced analytical scanning transmission electron microscopy and conventional transmission electron microscopy were applied to investigate the radiation-induced segregation and phase instability behavior after neutron irradiation. Amorphization was observed in M₂₃C₆ carbides. Cr-rich clusters were seen within the matrix, near the lath boundaries and close to the M₂₃C₆ carbides. Cr enrichment and Fe depletion were detected at both prior austenite grain boundaries and lath boundaries, despite different segregation magnitude. In addition, the enrichment of Ni, the depletion of V, and tiny cavities (presumably helium bubbles) are also found at lath boundaries. This work interrogates the evolution of microstructures after neutron irradiation, which provides detailed understanding on the microstructural aspects controlling the mechanical integrity of Eurofer97 under high-dose neutron damage.

Original language	English
Article number	152834
Journal	Journal of Nuclear Materials
Volume	547
DOIs	https://doi.org/10.1016/j.jnucmat.2021.152834
State	Published - Apr 15 2021

Bibliographical note

Publisher Copyright:
© 2021

Funding

This work is part of the U.S. DOE – JAEA collaboration on Fusion Materials. Research sponsored by the Office of Fusion Energy Sciences, U.S. Department of Energy, and Japan Atomic Energy Agency under contracts DE-AC05-00OR22725 and NFE-19-02779, respectively, with UT-Battelle, LLC. A portion of this research used resources at the High Flux Isotope Reactor, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. This work is part of the U.S. DOE – JAEA collaboration on Fusion Materials. Research sponsored by the Office of Fusion Energy Sciences, U.S. Department of Energy , and Japan Atomic Energy Agency under contracts DE-AC05-00OR22725 and NFE-19-02779 , respectively, with UT-Battelle, LLC. A portion of this research used resources at the High Flux Isotope Reactor, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory.

Funders	Funder number
U.S. Department of Energy
Office of Science
Fusion Energy Sciences
Oak Ridge National Laboratory
Japan Atomic Energy Agency	DE-AC05-00OR22725, NFE-19-02779

Keywords

Analytical transmission electron microscopy
Elemental segregation
Microstructures
Neutron irradiation
Phase instability

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10.1016/j.jnucmat.2021.152834

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title = "Segregation behavior and phase instability of Eurofer97 after neutron irradiation to 72 dpa",

abstract = "A reduced activation ferritic/martensitic steel, Eurofer97, was neutron irradiated in the vicinity of 300 °C in the High Flux Isotope Reactor (HFIR) up to 72 dpa. Advanced analytical scanning transmission electron microscopy and conventional transmission electron microscopy were applied to investigate the radiation-induced segregation and phase instability behavior after neutron irradiation. Amorphization was observed in M23C6 carbides. Cr-rich clusters were seen within the matrix, near the lath boundaries and close to the M23C6 carbides. Cr enrichment and Fe depletion were detected at both prior austenite grain boundaries and lath boundaries, despite different segregation magnitude. In addition, the enrichment of Ni, the depletion of V, and tiny cavities (presumably helium bubbles) are also found at lath boundaries. This work interrogates the evolution of microstructures after neutron irradiation, which provides detailed understanding on the microstructural aspects controlling the mechanical integrity of Eurofer97 under high-dose neutron damage.",

keywords = "Analytical transmission electron microscopy, Elemental segregation, Microstructures, Neutron irradiation, Phase instability",

author = "Kun Wang and Parish, {Chad M.} and Field, {Kevin G.} and Lizhen Tan and Yutai Katoh",

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T1 - Segregation behavior and phase instability of Eurofer97 after neutron irradiation to 72 dpa

AU - Wang, Kun

AU - Parish, Chad M.

AU - Field, Kevin G.

AU - Tan, Lizhen

AU - Katoh, Yutai

PY - 2021/4/15

Y1 - 2021/4/15

N2 - A reduced activation ferritic/martensitic steel, Eurofer97, was neutron irradiated in the vicinity of 300 °C in the High Flux Isotope Reactor (HFIR) up to 72 dpa. Advanced analytical scanning transmission electron microscopy and conventional transmission electron microscopy were applied to investigate the radiation-induced segregation and phase instability behavior after neutron irradiation. Amorphization was observed in M23C6 carbides. Cr-rich clusters were seen within the matrix, near the lath boundaries and close to the M23C6 carbides. Cr enrichment and Fe depletion were detected at both prior austenite grain boundaries and lath boundaries, despite different segregation magnitude. In addition, the enrichment of Ni, the depletion of V, and tiny cavities (presumably helium bubbles) are also found at lath boundaries. This work interrogates the evolution of microstructures after neutron irradiation, which provides detailed understanding on the microstructural aspects controlling the mechanical integrity of Eurofer97 under high-dose neutron damage.

AB - A reduced activation ferritic/martensitic steel, Eurofer97, was neutron irradiated in the vicinity of 300 °C in the High Flux Isotope Reactor (HFIR) up to 72 dpa. Advanced analytical scanning transmission electron microscopy and conventional transmission electron microscopy were applied to investigate the radiation-induced segregation and phase instability behavior after neutron irradiation. Amorphization was observed in M23C6 carbides. Cr-rich clusters were seen within the matrix, near the lath boundaries and close to the M23C6 carbides. Cr enrichment and Fe depletion were detected at both prior austenite grain boundaries and lath boundaries, despite different segregation magnitude. In addition, the enrichment of Ni, the depletion of V, and tiny cavities (presumably helium bubbles) are also found at lath boundaries. This work interrogates the evolution of microstructures after neutron irradiation, which provides detailed understanding on the microstructural aspects controlling the mechanical integrity of Eurofer97 under high-dose neutron damage.

KW - Analytical transmission electron microscopy

KW - Elemental segregation

KW - Microstructures

KW - Neutron irradiation

KW - Phase instability

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JO - Journal of Nuclear Materials

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ER -

Segregation behavior and phase instability of Eurofer97 after neutron irradiation to 72 dpa

Abstract

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Keywords

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