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Title: Helium effects on microstructural evolution in tempered martensitic steels: In situ helium implanter studies in HFIR

Abstract

Microstructural evolutions in tempered martensitic steels (TMS) under neutron-irradiation, at fusion relevant He/dpa ratios and dpa rates, were characterized using a novel in situ He-implanter technique. F82H-mod3 was irradiated at 500 C in HFIR to a nominal 9 dpa and 190 or 380 appm He in both in the as-tempered (AT) and 20% cold-worked (CW) conditions. In all cases, a high number density of 1-2 nm He-bubbles were observed, along with fewer but larger 10 nm void-like faceted cavities. The He-bubbles form preferentially on dislocations and various interfaces. A slightly larger number of smaller He bubbles were observed in the CW condition. The lower He/dpa ratio produced slightly smaller and fewer He-bubbles. Comparisons of these observations to the results in nano-structured ferritic alloy (NFA) MA957 provide additional evidence that TMS may be susceptible to He-embrittlement as well as void swelling at fusion relevant He concentrations, while NFA are much more resistant to these degradation phenomena.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
963836
Report Number(s):
PNNL-SA-66972
Journal ID: ISSN 0022-3115; JNUMAM; AT6020100; TRN: US200918%%241
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Journal of Nuclear Materials, 386:338-341
Additional Journal Information:
Journal Volume: 386; Journal ID: ISSN 0022-3115
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALLOYS; BUBBLES; CAVITIES; DISLOCATIONS; HELIUM; MARTENSITIC STEELS; SWELLING

Citation Formats

Yamamoto, Takuya, Odette, George R, Miao, Pifeng, Edwards, Danny J, and Kurtz, Richard J. Helium effects on microstructural evolution in tempered martensitic steels: In situ helium implanter studies in HFIR. United States: N. p., 2009. Web. doi:10.1016/j.jnucmat.2008.12.134.
Yamamoto, Takuya, Odette, George R, Miao, Pifeng, Edwards, Danny J, & Kurtz, Richard J. Helium effects on microstructural evolution in tempered martensitic steels: In situ helium implanter studies in HFIR. United States. doi:10.1016/j.jnucmat.2008.12.134.
Yamamoto, Takuya, Odette, George R, Miao, Pifeng, Edwards, Danny J, and Kurtz, Richard J. Thu . "Helium effects on microstructural evolution in tempered martensitic steels: In situ helium implanter studies in HFIR". United States. doi:10.1016/j.jnucmat.2008.12.134.
@article{osti_963836,
title = {Helium effects on microstructural evolution in tempered martensitic steels: In situ helium implanter studies in HFIR},
author = {Yamamoto, Takuya and Odette, George R and Miao, Pifeng and Edwards, Danny J and Kurtz, Richard J},
abstractNote = {Microstructural evolutions in tempered martensitic steels (TMS) under neutron-irradiation, at fusion relevant He/dpa ratios and dpa rates, were characterized using a novel in situ He-implanter technique. F82H-mod3 was irradiated at 500 C in HFIR to a nominal 9 dpa and 190 or 380 appm He in both in the as-tempered (AT) and 20% cold-worked (CW) conditions. In all cases, a high number density of 1-2 nm He-bubbles were observed, along with fewer but larger 10 nm void-like faceted cavities. The He-bubbles form preferentially on dislocations and various interfaces. A slightly larger number of smaller He bubbles were observed in the CW condition. The lower He/dpa ratio produced slightly smaller and fewer He-bubbles. Comparisons of these observations to the results in nano-structured ferritic alloy (NFA) MA957 provide additional evidence that TMS may be susceptible to He-embrittlement as well as void swelling at fusion relevant He concentrations, while NFA are much more resistant to these degradation phenomena.},
doi = {10.1016/j.jnucmat.2008.12.134},
journal = {Journal of Nuclear Materials, 386:338-341},
issn = {0022-3115},
number = ,
volume = 386,
place = {United States},
year = {2009},
month = {4}
}