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Title: Microstructural evolution of NF709 austenitic stainless steel under in-situ ion irradiations at room temperature, 300, 400, 500 and 600 °C

Abstract

Irradiation induced microstructural changes in the NF709 austenitic stainless steel were investigated under 1 MeV Kr ion irradiations to a dose of 3 dpa at room temperature (RT), 300, 400, 500 and 600 °C, and a dose of 20 dpa at RT. The irradiation-induced defects and the stability of precipitates were characterized with transmission electron microscopy (TEM). Frank dislocation loops were observed in all the irradiated samples, and the loop sizes were much larger at 600 °C than those at lower temperatures. “Raft” defect structures, formed through self-alignment of small dislocation loops, were also observed in all irradiated samples. M23C6 precipitates were amorphorized under irradiations at RT and 300 °C, but remained to be crystalline at 400 °C and above. MX precipitates were stable under irradiations at RT up to 20 dpa, and at temperatures below 600 °C to 3 dpa. At 600 °C, some MX precipitates were observed to dissolve during in-situ irradiation, suggesting possible precipitate instability at this irradiation temperature.

Authors:
 [1];  [2];  [2];  [3]
  1. Univ. of Florida, Gainesville, FL (United States); Argonne National Lab. (ANL), Argonne, IL (United States). Nuclear Engineering Division
  2. Argonne National Lab. (ANL), Argonne, IL (United States). Nuclear Engineering Division
  3. Univ. of Florida, Gainesville, FL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1490233
Grant/Contract Number:  
AC02-06CH11357; AC07-051D14517
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 509; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Austenitic stainless steel; In-situ ion irradiation; Irradiation microstructure; NF709

Citation Formats

Xu, Chi, Chen, Wei-Ying, Chen, Yiren, and Yang, Yong. Microstructural evolution of NF709 austenitic stainless steel under in-situ ion irradiations at room temperature, 300, 400, 500 and 600 °C. United States: N. p., 2018. Web. doi:10.1016/j.jnucmat.2018.07.044.
Xu, Chi, Chen, Wei-Ying, Chen, Yiren, & Yang, Yong. Microstructural evolution of NF709 austenitic stainless steel under in-situ ion irradiations at room temperature, 300, 400, 500 and 600 °C. United States. doi:10.1016/j.jnucmat.2018.07.044.
Xu, Chi, Chen, Wei-Ying, Chen, Yiren, and Yang, Yong. Mon . "Microstructural evolution of NF709 austenitic stainless steel under in-situ ion irradiations at room temperature, 300, 400, 500 and 600 °C". United States. doi:10.1016/j.jnucmat.2018.07.044. https://www.osti.gov/servlets/purl/1490233.
@article{osti_1490233,
title = {Microstructural evolution of NF709 austenitic stainless steel under in-situ ion irradiations at room temperature, 300, 400, 500 and 600 °C},
author = {Xu, Chi and Chen, Wei-Ying and Chen, Yiren and Yang, Yong},
abstractNote = {Irradiation induced microstructural changes in the NF709 austenitic stainless steel were investigated under 1 MeV Kr ion irradiations to a dose of 3 dpa at room temperature (RT), 300, 400, 500 and 600 °C, and a dose of 20 dpa at RT. The irradiation-induced defects and the stability of precipitates were characterized with transmission electron microscopy (TEM). Frank dislocation loops were observed in all the irradiated samples, and the loop sizes were much larger at 600 °C than those at lower temperatures. “Raft” defect structures, formed through self-alignment of small dislocation loops, were also observed in all irradiated samples. M23C6 precipitates were amorphorized under irradiations at RT and 300 °C, but remained to be crystalline at 400 °C and above. MX precipitates were stable under irradiations at RT up to 20 dpa, and at temperatures below 600 °C to 3 dpa. At 600 °C, some MX precipitates were observed to dissolve during in-situ irradiation, suggesting possible precipitate instability at this irradiation temperature.},
doi = {10.1016/j.jnucmat.2018.07.044},
journal = {Journal of Nuclear Materials},
number = ,
volume = 509,
place = {United States},
year = {2018},
month = {10}
}

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