Improvement of high speed plastic deformation behavior of ultrafine grained high Mn steel

• Project/Area Number: 21760589
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Material processing/treatments
• Research Institution: Kagawa University
• Principal Investigator: UEJI Rintaro Kagawa University, 工学部, 准教授 (80380145)
• Project Period (FY): 2009 – 2010
• Project Status: Completed (Fiscal Year 2010)
• Budget Amount: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000); Fiscal Year 2010: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2009: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
• Keywords: 鉄鋼材料 / 構造用材料 / 力学特性 / オーステナイト / 高速変形 / 金属材料 / 変形双晶 / 塑性変形 / 構造用金属材料 / 双晶変形 / TWIP鋼 / 結晶粒微細化 / 静動差 / 電子顕微鏡 / 鉄綱材料

Research Abstract

Difference between the strength at high speed and that at low speed (quasi-static rate) (DSHQ) is desired to become larger value for industrial applications. The aim of this study was to obtain an appropriate DSHQ in high Mn TWIP (Twinning induced plasticity) steel. The samples with different microstructures were fabricated and then those plastic behaviors were measured by room temperature tensile test at a strain rate up to 10^3/sec. When the sample was fully recrystallized, the strength becomes larger but the DSHQ decreases with decreasing of the mean grain size ; whereas the higher strength with larger DSHQ can be achieved successfully by means of the mixture of fine grains and lamellar dislocation structure. The microstructural observations clarified that the improvement of DSHQ is corresponded with the appearance of twinning deformation.

Research Products

• [Journal Article] Journal of Physics (2010)
  • Author(s): R.Ueji, Y.Okitsu, T.Nakamura, Y.Takagiand Y.Tanaka
  • Journal Title: Conference Series 240 Pages: 12029-12029
  • Peer Reviewed
• [Journal Article] S.M.Monir-Vaghefi (2010)
  • Author(s): G.Dini, R.Ueji, A.Najafizadeh
  • Journal Title: Materials Science and Engineering A 527 Pages: 2759-2763
  • Peer Reviewed
• [Journal Article] Materials Science Forum (2010)
  • Author(s): G.Dini, R.Ueji, A.Najafizadeh
  • Peer Reviewed
• [Journal Article] S.M.Monir-Vaghefi (2010)
  • Author(s): G.Dini, A.Najafizadeh, R.Ueji
  • Journal Title: Materials Letters 64 Pages: 15-18
  • Peer Reviewed
• [Journal Article] Mechanical properties of 15%Mn steel with fine lamellar structure consisting of ferrite and austenite (2010)
  • Author(s): R.Ueji
  • Journal Title: Journal of Physics : Conference Series Volume: 240 Pages: 12-29
  • Peer Reviewed
• [Journal Article] Flow stress analysis of TWIP steel via the XRD measurement of dislocation density (2010)
  • Author(s): G.Dini
  • Journal Title: Materials Science and Engineering : A Volume: 527 Pages: 27-59
  • Peer Reviewed
• [Journal Article] Grain size dependence of the flow stress of TWIP steel (2010)
  • Author(s): G.Dini
  • Journal Title: Materials Science Forum Volume: 654 Pages: 294-294
  • Peer Reviewed
• [Journal Article] Improved tensile properties of partially recrystallized submicron grained TWIP steel (2010)
  • Author(s): G.Dini
  • Journal Title: Materials Letters 64 Pages: 15-18
  • Peer Reviewed
• [Journal Article] Flow stress analysis of TWIP steel via the XRD measurement of dislocation density (2010)
  • Author(s): G.Dini
  • Journal Title: Materials Science and Engineering:A 527 Pages: 2759-2763
  • Peer Reviewed
• [Journal Article] Tensile deformation behavior of high manganese austenitic steel The role of grain size (2010)
  • Author(s): G.Dini
  • Journal Title: Materials & Design (掲載確定)
  • Peer Reviewed
• [Presentation] 高マンガンTWIP鋼および高マンガンTRIP 鋼の塑性変形挙動と結晶粒微細化 (2011)
  • Author(s): 上路林太郎
  • Organizer: 日本材料学会北陸信越支部特別講演会「金属材料の機械的特性と内部組織の関係」
  • Place of Presentation: 金沢大学(招待講演)
  • Year and Date: 2011-02-18
• [Presentation] 高マンガンTWIP鋼および高マンガンTRIP鋼の塑性変形挙動と結晶粒微細化 (2011)
  • Author(s): 上路林太郎
  • Organizer: 日本材料学会北陸信越支部特別講演会「金属材料の機械的特性と内部組織の関係」
  • Place of Presentation: 金沢大学(石川県)(招待講演)
  • Year and Date: 2011-02-18
• [Presentation] 高マンガン鋼の結晶粒微細化に伴うεマルテンサイト生成挙動と加工硬化 (2010)
  • Author(s): 上路林太郎, 他
  • Organizer: 日本鉄鋼協会第160回秋季講演大会
  • Place of Presentation: 北海道大学
  • Year and Date: 2010-09-26
• [Presentation] 高マンガン鋼の結晶粒微細化に伴うεマルテンサイト生成挙動と加工硬化 (2010)
  • Author(s): 上路林太郎
  • Organizer: 日本鉄鋼協会 第160回秋季講演大会
  • Place of Presentation: 北海道大学(北海道)
  • Year and Date: 2010-09-26
• [Presentation] ormation of 15%Mn steelwith fine lamellar structure consistingof ferrite and austenite phases, AISTech2010 (2010)
  • Author(s): R.Ueji, et al.
  • Organizer: The Iron & Steel TechnologyConference and exposition, AIST (米国鉄鋼協会)
  • Place of Presentation: DavidL.Lawrence convention center(Pa., USA)
  • Year and Date: 2010-05-23
• [Presentation] High speed deformation of 15%Mn steel with fine lamellar structure consisting of ferrite and austenite phases (2010)
  • Author(s): 上路林太郎
  • Organizer: AISTech 2010, The Iron & Steel Technology Conference and exposition, AIST (米国鉄鋼協会)
  • Place of Presentation: David L.Lawrence convention center (Pa., USA)
  • Year and Date: 2010-05-03
• [Presentation] Mechanical properties of15%Mn Steel with FineLamellar Structure Consisting of Ferrite and AustenitePhases (2009)
  • Author(s): R.Ueji, et al.
  • Organizer: 15th International Conferenceon the Strength of Materials
  • Place of Presentation: ドレスデン工科大学(ドイツ)
  • Year and Date: 2009-09-17
• [Presentation] Mechanical Properties of 15%Mn Steel with FineLamellar Structure Consisting of Ferrite and Austenite Phases (2009)
  • Author(s): 上路林太郎
  • Organizer: 15th International Conference on the Strength of Materials ; ICSMA-15
  • Place of Presentation: ドレスデン工科大学(ドイツ)
  • Year and Date: 2009-09-17
• [Remarks]
  • URL: http://www.eng.kagawa-u.ac.jp/~ueji/
• [Remarks]
  • URL: http://www.eng.kagawa-u.ac.jp/~ueji
• [Remarks]
  • URL: http://www.eng.kagawa-u.ac.jp/~ueji/