Irradiation response of delta ferrite in as-cast and thermally aged cast stainless steel

Zhangbo Li; Wei Yang Lo; Yiren Chen; Janne Pakarinen; Yaqiao Wu; Todd Allen; Yong Yang

doi:10.1016/j.jnucmat.2015.08.006

Irradiation response of delta ferrite in as-cast and thermally aged cast stainless steel

Zhangbo Li
, Wei Yang Lo
, Yiren Chen
, Janne Pakarinen
, Yaqiao Wu
, Todd Allen
, Yong Yang^*

^*Corresponding author for this work

Not published at VTT

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

45 Citations (Scopus)

Abstract

To enable the life extension of Light Water Reactors (LWRs) beyond 60 years, it is critical to gain adequate knowledge for making conclusive predictions to assure the integrity of duplex stainless steel reactor components, e.g. primary pressure boundary and reactor vessel internal. Microstructural changes in the ferrite of thermally aged, neutron irradiated only, and neutron irradiated after being thermally aged cast austenitic stainless steels (CASS) were investigated using atom probe tomography. The thermal aging was performed at 400 °C for 10,000 h and the irradiation was conducted in the Halden reactor at ∼315 °C to 0.08 dpa (5.6 × 10¹⁹ n/cm², E > 1 MeV). Low dose neutron irradiation at a dose rate of 5 × 10^-9 dpa/s was found to induce spinodal decomposition in the ferrite of as-cast microstructure, and further to enhance the spinodal decomposition in the thermally aged cast alloys. Regarding the G-phase precipitates, the neutron irradiation dramatically increases the precipitate size, and alters the composition of the precipitates with increased, Mn, Ni, Si and Mo and reduced Fe and Cr contents. The results have shown that low dose neutron irradiation can further accelerate the degradation of ferrite in a duplex stainless steel at the LWR relevant condition. Published by Elsevier B.V.

Original language	English
Pages (from-to)	201-207
Journal	Journal of Nuclear Materials
Volume	466
DOIs	https://doi.org/10.1016/j.jnucmat.2015.08.006
Publication status	Published - 18 Aug 2015
MoE publication type	A1 Journal article-refereed

Funding

The authors would like to thank the program manager Dr. Rao at the Nuclear Regulatory Commission for his strong support. This research was sponsored by the U. S. NRC under the Job Code V6454 as a subcontract from the Argonne National Laboratory and NRC regulatory research funding NRC-HQ-14-G-0014 . This work was supported by the U.S. Department of Energy, Office of Nuclear Energy under DOE Idaho Operations Office Contract DE-AC07-051D14517 as part of a Nuclear Science User Facilities experiment.

Keywords

Atom probe tomography
Delta ferrite
Duplex stainless steel
Neutron irradiation
Thermal aging

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10.1016/j.jnucmat.2015.08.006

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title = "Irradiation response of delta ferrite in as-cast and thermally aged cast stainless steel",

abstract = "To enable the life extension of Light Water Reactors (LWRs) beyond 60 years, it is critical to gain adequate knowledge for making conclusive predictions to assure the integrity of duplex stainless steel reactor components, e.g. primary pressure boundary and reactor vessel internal. Microstructural changes in the ferrite of thermally aged, neutron irradiated only, and neutron irradiated after being thermally aged cast austenitic stainless steels (CASS) were investigated using atom probe tomography. The thermal aging was performed at 400 °C for 10,000 h and the irradiation was conducted in the Halden reactor at ∼315 °C to 0.08 dpa (5.6 × 1019 n/cm2, E > 1 MeV). Low dose neutron irradiation at a dose rate of 5 × 10-9 dpa/s was found to induce spinodal decomposition in the ferrite of as-cast microstructure, and further to enhance the spinodal decomposition in the thermally aged cast alloys. Regarding the G-phase precipitates, the neutron irradiation dramatically increases the precipitate size, and alters the composition of the precipitates with increased, Mn, Ni, Si and Mo and reduced Fe and Cr contents. The results have shown that low dose neutron irradiation can further accelerate the degradation of ferrite in a duplex stainless steel at the LWR relevant condition. Published by Elsevier B.V.",

keywords = "Atom probe tomography, Delta ferrite, Duplex stainless steel, Neutron irradiation, Thermal aging",

author = "Zhangbo Li and Lo, \{Wei Yang\} and Yiren Chen and Janne Pakarinen and Yaqiao Wu and Todd Allen and Yong Yang",

year = "2015",

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doi = "10.1016/j.jnucmat.2015.08.006",

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T1 - Irradiation response of delta ferrite in as-cast and thermally aged cast stainless steel

AU - Li, Zhangbo

AU - Lo, Wei Yang

AU - Chen, Yiren

AU - Pakarinen, Janne

AU - Wu, Yaqiao

AU - Allen, Todd

AU - Yang, Yong

PY - 2015/8/18

Y1 - 2015/8/18

N2 - To enable the life extension of Light Water Reactors (LWRs) beyond 60 years, it is critical to gain adequate knowledge for making conclusive predictions to assure the integrity of duplex stainless steel reactor components, e.g. primary pressure boundary and reactor vessel internal. Microstructural changes in the ferrite of thermally aged, neutron irradiated only, and neutron irradiated after being thermally aged cast austenitic stainless steels (CASS) were investigated using atom probe tomography. The thermal aging was performed at 400 °C for 10,000 h and the irradiation was conducted in the Halden reactor at ∼315 °C to 0.08 dpa (5.6 × 1019 n/cm2, E > 1 MeV). Low dose neutron irradiation at a dose rate of 5 × 10-9 dpa/s was found to induce spinodal decomposition in the ferrite of as-cast microstructure, and further to enhance the spinodal decomposition in the thermally aged cast alloys. Regarding the G-phase precipitates, the neutron irradiation dramatically increases the precipitate size, and alters the composition of the precipitates with increased, Mn, Ni, Si and Mo and reduced Fe and Cr contents. The results have shown that low dose neutron irradiation can further accelerate the degradation of ferrite in a duplex stainless steel at the LWR relevant condition. Published by Elsevier B.V.

AB - To enable the life extension of Light Water Reactors (LWRs) beyond 60 years, it is critical to gain adequate knowledge for making conclusive predictions to assure the integrity of duplex stainless steel reactor components, e.g. primary pressure boundary and reactor vessel internal. Microstructural changes in the ferrite of thermally aged, neutron irradiated only, and neutron irradiated after being thermally aged cast austenitic stainless steels (CASS) were investigated using atom probe tomography. The thermal aging was performed at 400 °C for 10,000 h and the irradiation was conducted in the Halden reactor at ∼315 °C to 0.08 dpa (5.6 × 1019 n/cm2, E > 1 MeV). Low dose neutron irradiation at a dose rate of 5 × 10-9 dpa/s was found to induce spinodal decomposition in the ferrite of as-cast microstructure, and further to enhance the spinodal decomposition in the thermally aged cast alloys. Regarding the G-phase precipitates, the neutron irradiation dramatically increases the precipitate size, and alters the composition of the precipitates with increased, Mn, Ni, Si and Mo and reduced Fe and Cr contents. The results have shown that low dose neutron irradiation can further accelerate the degradation of ferrite in a duplex stainless steel at the LWR relevant condition. Published by Elsevier B.V.

KW - Atom probe tomography

KW - Delta ferrite

KW - Duplex stainless steel

KW - Neutron irradiation

KW - Thermal aging

UR - https://www.scopus.com/pages/publications/84939418850

U2 - 10.1016/j.jnucmat.2015.08.006

DO - 10.1016/j.jnucmat.2015.08.006

M3 - Article

AN - SCOPUS:84939418850

SN - 0022-3115

VL - 466

SP - 201

EP - 207

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

ER -

Irradiation response of delta ferrite in as-cast and thermally aged cast stainless steel

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