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Production and Properties of Nano-scale Oxide Dispersion Strengthened (ODS) 9Cr Martensitic Steel Claddings

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Title: Production and Properties of Nano-scale Oxide Dispersion Strengthened (ODS) 9Cr Martensitic Steel Claddings
Authors: Ukai, Shigeharu Browse this author →KAKEN DB
Kaito, Takeji Browse this author
Ohtsuka, Satoshi Browse this author
Narita, Tsuyoshi Browse this author
Fujiwara, Masayuki Browse this author
Kobayashi, Toshimi Browse this author
Keywords: ODS
phase transformation
excess oxygen
tensile strength
creep rupter strength
cold rolling
grain size
Issue Date: 15-Dec-2003
Publisher: Iron and Steel Institute of Japan
Journal Title: ISIJ International
Volume: 43
Issue: 12
Start Page: 2038
End Page: 2045
Publisher DOI: 10.2355/isijinternational.43.2038
Abstract: The 9Cr-ODS martensitic steel claddings were developed by cold-rolling and subsequent heat-treatment. The standard chemical composition is Fe-0.13C-9Cr-2W-0.2Ti-0.35Y2O3. The substantially elongated grains formed by cold-rolling turned out to be into equi-axied grains by ferrite to austenite phase transformation at the final heat-treatment. The produced claddings have the tempered martensitic structure and excess oxygen of 0.060 mass%. The superior tensile and creep rupture strength were shown in the produced cladding, compared with conventional ferritic (PNC-FMS) and even austenitic (PNC316) claddings at higher temperature and extended time. The strength improvement is attributed to finely distributed nano-scale complex oxide. The coarser ferrite grains produced by slow cooling make further improvement in the tensile and creep rupture strength beyond those of tempered martensite at high temperature and longer testing time. The higher excess oxygen content of 0.137 mass% prevents fine distribution of the oxide particles that lead to inferior high temperature tensile and creep strength.
Rights: 著作権は日本鉄鋼協会にある
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 鵜飼 重治

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