Effect of Heat Treatment on Precipitation Kinetics in High-Cr Ferritic Steels.

• Yamada Katsumi

  NKK

• Igarashi Masaaki

  Sumitomo Metal Industries, Ltd.

• Muneki Seiichi

  National Institute for Materials Science

• Abe Fujio

  National Institute for Materials Science

抄録

Precipitation strengthening is important to improve creep strength of heat resisting steels at elevated temperatures. Especially, in the high-Cr ferritic steels recently developed for Ultra Super Critical Power Plants, precipitation behavior is complicated and should be clarified because the correlation between various strengthening factors are still not well understood. In this study, we focus on the change in precipitation behavior of MX type carbonitrides in model steels with different heat treatment conditions.<br>It is found that dominant precipitation behavior has been changed with cooling rate from normalization temperature before tempering and better creep properties have been obtained in the steel quenched rather than in the one air-cooled. It is confirmed that precipitation of M₂₃C₆ is suppressed and total fraction of MX is relatively increased by the quenching procedure. It is thought that better creep resistance is mainly due to fine distribution of MX that is achieved by suppressing typical co-precipitation of MX such as Nb(C, N)-VN during cooling after normalization and tempering.

収録刊行物

• ＩＳＩＪ　Ｉｎｔｅｒｎａｔｉｏｎａｌ

  ＩＳＩＪ　Ｉｎｔｅｒｎａｔｉｏｎａｌ 42 (7), 779-784, 2002

  一般社団法人 日本鉄鋼協会

キーワード

• heat resisting steels
• creep properties
• MX, cooling rate
• precipitation strengthening

詳細情報

• CRID: 1390001206452339456
• NII論文ID: 10009268445
• NII書誌ID: AA10680712
• DOI: 10.2355/isijinternational.42.779
• COI: 1:CAS:528:DC%2BD38XmslyisLo%3D
• ISSN: 13475460
• ISSN: 09151559
• ISSN: http://id.crossref.org/issn/09151559
• Web Site: http://www.jstage.jst.go.jp/article/isijinternational1989/42/7/42_7_779/_pdf
• 本文言語コード: en
• データソース種別:
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  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可