Evaluation of Sensitization and Self-Healing in Austenitic Stainless Steels Based on Simulations of Cr-Depleted Zones

• Tokunaga Tatsuya

  Department of Applied Science for Integrated System Engineering, Kyushu Institute of Technology

• Ohtani Hiroshi

  Department of Materials Science and Engineering, Kyushu Institute of Technology

• Ågren John

  Department of Materials Science and Engineering, The Royal Institute of Technology

抄録

A simulation of the grain boundary precipitation of the Cr-rich carbide, M₂₃C₆, in austenitic stainless steels has been carried out using the DICTRA software package employing kinetic and thermodynamic databases. Our calculations reproduced the evolution of the Cr-depleted zone close to M₂₃C₆ carbide and the disappearance of the zone after a long annealing time. In addition, the calculated time-temperature-sensitization diagrams were in line with the experimental results of typical corrosion trends with annealing time. According to our results, despite the simple treatment used, a reasonable approximation for the simulations was to set the initial width of the austenite region from which the carbon was drawn as a sixth of the grain size. We also confirmed that the onset of sensitization for a steel with 0.1 mass%C shifted to shorter times and to higher temperatures compared with a steel with 0.06 mass%C.

収録刊行物

• ＩＳＩＪ　Ｉｎｔｅｒｎａｔｉｏｎａｌ

  ＩＳＩＪ　Ｉｎｔｅｒｎａｔｉｏｎａｌ 51 (6), 965-968, 2011

  一般社団法人 日本鉄鋼協会

キーワード

• sensitization
• self-healing
• simulation
• Cr-depleted zone
• M₂₃C₆
• austenitic stainless steels

詳細情報

• CRID: 1390282681465209728
• NII論文ID: 10030381635
• NII書誌ID: AA10680712
• DOI: 10.2355/isijinternational.51.965
• ISSN: 13475460
• ISSN: 09151559
• Web Site: http://www.jstage.jst.go.jp/article/isijinternational/51/6/51_6_965/_pdf
• 本文言語コード: en
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可