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Title: Effect of Cr/Al contents on the 475℃ age-hardening in oxide dispersion strengthened ferritic steels
Authors: Han, Wentuo
Yabuuchi, Kiyohiro  kyouindb  KAKEN_id
Kimura, Akihiko  kyouindb  KAKEN_id
Ukai, Shigeharu
Oono, Naoko
Kaito, Takeji
Torimaru, Tadahiko
Hayashi, Shigenari
Keywords: ODS ferritic steel
475℃ embrittlement
Al and Cr effects
Cr-enriched α′ phase
Hardness evolution
Issue Date: Dec-2016
Publisher: Elsevier BV
Journal title: Nuclear Materials and Energy
Volume: 9
Start page: 610
End page: 615
Abstract: The age-hardening in oxide dispersion strengthened (ODS) ferritic steels with various additions of Cr (12, 15 and 18 wt.%) and Al (0, 5, 7 and 9 wt.%) were investigated. After 5000 h aging at 475ºC, the hardness increases in all these ODS steels, while the increased level depends on the Cr/Al contents. In 12Cr-ODS steels, the more the Al, the higher the increased hardness is. However, in 18Cr-ODS steels, higher Al addition suppresses the age-hardening. TEM observations of 18Cr-ODS steels reveal that 9Al suppresses the formation of Cr-enriched α' phase, while the 18Cr-5Al-ODS steel comprises a plenty of α′ phases. Adding Zr in ODS steels appears to increase the age-hardening. The susceptibility to age-hardening is remarkably lower in the ODS ferritic steels than in the non-ODS ferritic steel with the similar concentration of Cr.
Rights: © 2016 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
URI: http://hdl.handle.net/2433/218604
DOI(Published Version): 10.1016/j.nme.2016.05.015
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