Phase transformation analysis by simultaneous measurements of neutron diffraction and dilatometry

• Project/Area Number: 19360325
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Material processing/treatments
• Research Institution: Ibaraki University
• Principal Investigator: TOMOTA Yo Ibaraki University, 理工学研究科, 教授 (90007782)
• Project Period (FY): 2007 – 2008
• Project Status: Completed (Fiscal Year 2008)
• Budget Amount: ¥20,800,000 (Direct Cost: ¥16,000,000、Indirect Cost: ¥4,800,000); Fiscal Year 2008: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000); Fiscal Year 2007: ¥15,470,000 (Direct Cost: ¥11,900,000、Indirect Cost: ¥3,570,000)
• Keywords: 中性子回折 / 熱膨張測定 / 組織制御 / 相変態 / 小角散乱

Research Abstract

熱膨張測定と同時に、その場中性子小角・広角散乱回折を用いて結晶構造・ミクロ因子を連続的に定量評価する方法を開発した。原子炉中性子源を用いて、鉄鋼材料における過冷オーステナイトからのベイナイト変態に関して、前駆現象、変態進行の速度論と結晶学的考察を行った。また、加速器中性子源を用いて、上記ベイナイト変態に加えて高温圧縮変形がフェライト変態に及ぼす影響と温間加工中の再結晶・析出の競合現象を明らかにした。

Research Products

• [Journal Article] In situ TOF Neutron Diffraction for Isothermal Ferrite Transformation during Thermomechanical Controlled Process of Low Alloy Steels (2009)
  • Author(s): P.G. Xu, Y.Tomota, T.Suzuki,M.Yonemura, E.C.Oliver
  • Journal Title: Journal of Japan Soc. Heat Treatment (掲載決定)
  • Peer Reviewed
• [Journal Article] In situ TOF Neutron Diffraction for Isothermal Ferrite Transformation during Thermomechanical Controlled Process of Low Alloy Steels (2009)
  • Author(s): P. G. Xu, Y. Tomota, T. Suzuki, M. Yonemura, E. C. Oliver
  • Journal Title: 熱処理 (5月号掲載予定)
  • Peer Reviewed
• [Journal Article] Dynamic Recrystallization and Dynamic Precipitation Behavior of a Fe-17Ni-0.2C Martensite Steel Studied by In Situ Neutron Diffraction (2008)
  • Author(s): P.G.Xu, Y.Tomota and E.C.Oliver
  • Journal Title: ISIJ Int 48 Pages: 1623-1630
  • Peer Reviewed
• [Journal Article] Dynamic Recrystallization and Dynamic Precipitation Behavior of a Fe-17Ni-0.2C Martensite Steel Studied by In Situ Neutron Diffraction (2008)
  • Author(s): P. G. Xu, Y. Tomota, and E. C. Oliver
  • Journal Title: ISIJ Int 48 Pages: 1623-1630
  • Peer Reviewed
• [Presentation] 中性子回折と熱膨張同時測定によるベイナイト変態挙動の検討 (2009)
  • Author(s): 具民書, 徐平光, 友田陽, 鈴木裕士
  • Organizer: 日本鉄鋼協会平成21年度春季講演大会
  • Place of Presentation: 東京(東工大)
  • Year and Date: 2009-03-28
• [Presentation] Effect of Austenite Deformation on Isothermal Ferrite Transformation in a Low-Alloy Steel Studied by In Situ Neutron Diffraction (2009)
  • Author(s): P.G.Xu, Y.Tomota, T.Suzuki, M.Yonemura and E.C.Oliver
  • Organizer: 日本鉄鋼協会平成21年度春季講演大会
  • Place of Presentation: 東京(東工大)
  • Year and Date: 2009-03-28
• [Presentation] In situ neutron diffraction during processing and mechanical response of steels, Asian Science Seminar(2008) (2008)
  • Author(s): Y.Tomota
  • Organizer: China Institute of Advanced Science and Engineering,(Invited lecture)
  • Place of Presentation: Beijin, China
  • Year and Date: 2008-10-20
• [Presentation] Role of Austenite in Dynamic Recrystallization during Warm Compression for a 17Ni-0.2C Martensite Steel Studied by In Situ Neutron Diffraction (2008)
  • Author(s): P.G.Xu, Y.Tomota and E.C.Oliver
  • Organizer: 日本鉄鋼協会平成20年度春季講演大会
  • Place of Presentation: 東京(武蔵工大)
  • Year and Date: 2008-03-27
• [Remarks] 茨城大学研究者情報総覧
  • URL: http://info.ibaraki.ac.jp/scripts/websearch/index.htm
• [Remarks] 茨城大学研究者情報総覧
  • URL: http://info.ibaraki.ac.jp/scripts/websearch/index.htm