Helium bubble formation behavior in ODS ferritic steels with and without simultaneous addition of Al and Zr

•He effects were studied for two ODS ferritic steels with/without simultaneous addition of Al and Zr.•Trapping effects of oxide particles, grain boundaries, dislocations on He atoms were discussed.•Oxide particles with a high sink strength contribute to enhanced swelling resistance. Two 14.5wt.% Cr-...

Full description

Saved in:
Bibliographic Details
Published in:Fusion engineering and design 2017-12, Vol.125, p.396-401
Main Authors: Song, Peng, Zhang, Zhexian, Yabuuchi, Kiyohiro, Kimura, Akihiko
Format: Article
Language:English
Subjects:
Aluminum
Bubbles
Dislocation density
Dispersion hardening steels
Ferritic stainless steels
He irradiation
Helium
Irradiation
ODS steel
Sink strength
Steel
Studies
Swelling
Zirconium
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:•He effects were studied for two ODS ferritic steels with/without simultaneous addition of Al and Zr.•Trapping effects of oxide particles, grain boundaries, dislocations on He atoms were discussed.•Oxide particles with a high sink strength contribute to enhanced swelling resistance. Two 14.5wt.% Cr-ODS ferritic steels with and without simultaneous addition of 3.5wt.% Al and 0.27wt.% Zr were irradiated with He+ up to 0.2dpa/3500appm at 300°C, 550°C, 700°C in order to investigate the effects of Al and Zr addition on He bubble formation behavior in 14.5Cr-ODS ferritic steel. The mean grain size of each ODS steel was about 370nm. Al addition resulted in the formation of larger oxide particles with a lower number density in 14.5Cr-ODS ferritic steel. After irradiation to 0.2dpa/3500appm He, dislocation densities in both ODS ferritic steels showed no change. However, the size and number density of He bubbles were increased and decreased, respectively, by the simultaneous addition of Al and Zr. Although both ODS steels showed good resistance to He-bubble induced swelling, the 14.5Cr-ODS steel possessed a better swelling resistance than 14.5Cr-3.5Al (Zr)-ODS steel. It was considered that the oxide particles were the main contributor for the swelling resistance of ODS steels by providing a number of defect sinks with a high sink strength. The swelling increased with increasing irradiation temperature in both ODS steels, indicating that the de-trapping He enhanced He-bubble swelling.
ISSN:0920-3796
1873-7196
DOI:10.1016/j.fusengdes.2017.03.139