skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

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 spinod,al 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. Lastly, The results have shown that low dose neutron irradiation can further accelerate the degradation of ferrite in a duplex stainless steel at the LWRmore » relevant condition.« less

Authors:
 [1];  [1];  [2];  [3];  [4];  [5];  [1]
  1. Univ. of Florida, Gainesville, FL (United States). Dept. of Materials Science and Engineering
  2. Argonne National Lab. (ANL), Lemont, IL (United States). Nuclear Engineering Div.
  3. Belgian Nuclear Research Center (SCK-CEN), Mol (Belgium)
  4. Boise State Univ., ID (United States). Dept of Materials Science and Engineering; Center for Advanced Studies, Idaho Falls, ID (United States)
  5. Univ. of Wisconsin, Madison, WI (United States). Engineering Physics Dept.; Idaho National Lab. (INL), Idaho Falls, ID (United States)
Publication Date:
Research Org.:
Idaho National Laboratory (INL), Idaho Falls, ID (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1273150
Alternate Identifier(s):
OSTI ID: 1252253
Grant/Contract Number:  
AC07-051D14517
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 466; Journal Issue: C; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; thermal aging; duplex stainless steel; neutron irradiation; atom probe tomography; delta ferrite

Citation Formats

Li, Zhangbo, Lo, Wei-Yang, Chen, Yiren, Pakarinen, Janne, Wu, Yaqiao, Allen, Todd, and Yang, Yong. Irradiation response of delta ferrite in as-cast and thermally aged cast stainless steel. United States: N. p., 2015. Web. doi:10.1016/j.jnucmat.2015.08.006.
Li, Zhangbo, Lo, Wei-Yang, Chen, Yiren, Pakarinen, Janne, Wu, Yaqiao, Allen, Todd, & Yang, Yong. Irradiation response of delta ferrite in as-cast and thermally aged cast stainless steel. United States. https://doi.org/10.1016/j.jnucmat.2015.08.006
Li, Zhangbo, Lo, Wei-Yang, Chen, Yiren, Pakarinen, Janne, Wu, Yaqiao, Allen, Todd, and Yang, Yong. 2015. "Irradiation response of delta ferrite in as-cast and thermally aged cast stainless steel". United States. https://doi.org/10.1016/j.jnucmat.2015.08.006. https://www.osti.gov/servlets/purl/1273150.
@article{osti_1273150,
title = {Irradiation response of delta ferrite in as-cast and thermally aged cast stainless steel},
author = {Li, Zhangbo and Lo, Wei-Yang and Chen, Yiren and Pakarinen, Janne and Wu, Yaqiao and Allen, Todd and Yang, Yong},
abstractNote = {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 spinod,al 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. Lastly, 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.},
doi = {10.1016/j.jnucmat.2015.08.006},
url = {https://www.osti.gov/biblio/1273150}, journal = {Journal of Nuclear Materials},
issn = {0022-3115},
number = C,
volume = 466,
place = {United States},
year = {Sat Aug 08 00:00:00 EDT 2015},
month = {Sat Aug 08 00:00:00 EDT 2015}
}

Journal Article:

Citation Metrics:
Cited by: 27 works
Citation information provided by
Web of Science

Save / Share:

Works referenced in this record:

Aging kinetics of CF3 cast stainless steel in temperature range 300–400°C
journal, March 1990


Aging and life prediction of cast duplex stainless steel components
journal, January 1992


A review of irradiation effects on LWR core internal materials – Neutron embrittlement
journal, May 2011


Low temperature aging embrittlement of CF-8 stainless steel
journal, August 1999


Effect of neutron-irradiation on the spinodal decomposition of Fe-32% Cr model alloy
journal, June 1996


Effects of radiation on spinodal decomposition of ferrite in duplex stainless steel
journal, September 2013


Quantitative atom probe tomography characterization of microstructures in a proton irradiated 304 stainless steel
journal, August 2014


Defining clusters in APT reconstructions of ODS steels
journal, September 2013


Atom probe tomography of nanoscale particles in ODS ferritic alloys
journal, July 2003


Atom Probe Studies of the Fe–Cr System and Stainless Steels Aged at Intermediate Temperature
journal, January 2000


Phase stability under irradiation — a review of theory and experiment
journal, August 1979


Works referencing / citing this record:

Evaluation of the thermal aging of δ-ferrite in austenitic stainless steel welds by electrochemical analysis
journal, October 2018


Proton Irradiation Effects on Hardness and the Volta Potential of Welding 308L Duplex Stainless Steel
journal, December 2018