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Title: The Transport and Fate of Helium in Martensitic Steels at Fusion Relevant He/DPA Ratios and DPA Rates

Abstract

Understanding, modeling and managing the effects of He and displacement damage on microstructural evolution and property changes are primary objectives of fusion materials research. We recently implemented an approach for producing controlled He-to-dpa ratios under neutron irradiation using a novel α-implantation technique. Thin 1-4 µm NiAl coatings were deposited on Eurofer-97 TEM discs to produce a uniform He deposition zone of 6 to 8 µm. The test matrix is aimed at characterizing the transport, fate and consequences of He and He-to-dpa ratio variation on alloys with a wide range of starting microstructure. We explore the effect He-to-dpa ratio and temperature on the microstructure of conventionally processed Eurofer-97. Bubbles were found at all irradiation temperatures, with estimated maximum diameters of ~12, 6.9 and 1.4 nm at 500°C (~9 dpa and 372 appm He), 400°C (~3.9 dpa and 82 appm He) and 300°C (~3.9 dpa and 89 appm He), respectively.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
912498
Report Number(s):
PNNL-SA-54802
Journal ID: ISSN 0022-3115; JNUMAM; AT6020100; TRN: US200801%%1053
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Journal of Nuclear Materials, 367-370 A:417-422
Additional Journal Information:
Journal Volume: 367-370; Journal ID: ISSN 0022-3115
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALLOYS; BUBBLES; COATINGS; DEPOSITION; HELIUM; IRRADIATION; MARTENSITIC STEELS; MICROSTRUCTURE; NEUTRONS; SIMULATION; TRANSPORT

Citation Formats

Kurtz, Richard J, Odette, George R, Yamamoto, Takuya, Gelles, David S, Miao, Pifeng, and Oliver, Brian M. The Transport and Fate of Helium in Martensitic Steels at Fusion Relevant He/DPA Ratios and DPA Rates. United States: N. p., 2007. Web. doi:10.1016/j.jnucmat.2007.03.121.
Kurtz, Richard J, Odette, George R, Yamamoto, Takuya, Gelles, David S, Miao, Pifeng, & Oliver, Brian M. The Transport and Fate of Helium in Martensitic Steels at Fusion Relevant He/DPA Ratios and DPA Rates. United States. doi:10.1016/j.jnucmat.2007.03.121.
Kurtz, Richard J, Odette, George R, Yamamoto, Takuya, Gelles, David S, Miao, Pifeng, and Oliver, Brian M. Wed . "The Transport and Fate of Helium in Martensitic Steels at Fusion Relevant He/DPA Ratios and DPA Rates". United States. doi:10.1016/j.jnucmat.2007.03.121.
@article{osti_912498,
title = {The Transport and Fate of Helium in Martensitic Steels at Fusion Relevant He/DPA Ratios and DPA Rates},
author = {Kurtz, Richard J and Odette, George R and Yamamoto, Takuya and Gelles, David S and Miao, Pifeng and Oliver, Brian M},
abstractNote = {Understanding, modeling and managing the effects of He and displacement damage on microstructural evolution and property changes are primary objectives of fusion materials research. We recently implemented an approach for producing controlled He-to-dpa ratios under neutron irradiation using a novel α-implantation technique. Thin 1-4 µm NiAl coatings were deposited on Eurofer-97 TEM discs to produce a uniform He deposition zone of 6 to 8 µm. The test matrix is aimed at characterizing the transport, fate and consequences of He and He-to-dpa ratio variation on alloys with a wide range of starting microstructure. We explore the effect He-to-dpa ratio and temperature on the microstructure of conventionally processed Eurofer-97. Bubbles were found at all irradiation temperatures, with estimated maximum diameters of ~12, 6.9 and 1.4 nm at 500°C (~9 dpa and 372 appm He), 400°C (~3.9 dpa and 82 appm He) and 300°C (~3.9 dpa and 89 appm He), respectively.},
doi = {10.1016/j.jnucmat.2007.03.121},
journal = {Journal of Nuclear Materials, 367-370 A:417-422},
issn = {0022-3115},
number = ,
volume = 367-370,
place = {United States},
year = {2007},
month = {8}
}