New model for grain boundary strengthening evaluated by micromechanical characterization

• Project/Area Number: 24686082
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Partial Multi-year Fund
• Research Field: Material processing/treatments
• Research Institution: Kyoto University
• Principal Investigator: SHIBATA Akinobu 京都大学, 工学(系)研究科(研究院), 准教授 (60451994)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥27,040,000 (Direct Cost: ¥20,800,000、Indirect Cost: ¥6,240,000); Fiscal Year 2014: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000); Fiscal Year 2013: ¥6,110,000 (Direct Cost: ¥4,700,000、Indirect Cost: ¥1,410,000); Fiscal Year 2012: ¥18,590,000 (Direct Cost: ¥14,300,000、Indirect Cost: ¥4,290,000)
• Keywords: 粒界 / 強化機構 / 力学特性 / マイクロメカニカルキャラクタリゼーション / 電子顕微鏡法

Outline of Final Research Achievements

The present study evaluated the effect of grain boundary on strength by micromechanical characterization using the specimen containing only one grain boundary. The micromechanical characterization revealed that the strengthening of grain boundary changed with compression axis even in the identical grain boundary. We found that the increases of strength evaluated by compatibility of plastic deformation were much higher than those experimentally obtained. This indicated that it is necessary to consider the factors other than compatibility of plastic deformation to account for grain boundary strengthening.

Research Products

• [Journal Article] Crystallographic features of hydrogen-related Fracture in martensitic carbon steels (2013)
  • Author(s): A. Shibata, T. Murata, N. Tsuji
  • Journal Title: Proceedings of the International Symposium on New Developments in Advanced High-Strength Sheet Steels Volume: なし Pages: 293-302
  • Peer Reviewed
• [Journal Article] Effect of strain rate on hydrogen embrittlement in low-carbon martensitic steel (2013)
  • Author(s): Y. Momotani, A. Shibata, D. Terada, N. Tsuji
  • Journal Title: Proceedings of the International Symposium on New Developments in Advanced High-Strength Sheet Steels Volume: なし Pages: 303-310
  • Peer Reviewed
• [Journal Article] Relationship between low-temperature embrittlement and microstructure of martensite in low-carbon martensitic steel (2013)
  • Author(s): M. Tsuboi, A. Shibata, D. Terada, N. Tsuji
  • Journal Title: Proceedings of the International Symposium on New Developments in Advanced High-Strength Sheet Steels Volume: なし Pages: 377-382
  • Peer Reviewed
• [Journal Article] Effect of prior austenite grain size on hydrogen embrittlement behaviors in 8Ni-0.1C steel (2013)
  • Author(s): A. Shibata, T. Matsuoka, N. Tsuji
  • Journal Title: Proceedings of the 8th Pacific Rim International Congress on Advanced Materials and Processing Volume: なし Pages: 583-589
  • Peer Reviewed
• [Journal Article] Martensitic transformation from nanocrystalline austenite in Fe-Ni alloys fabricated by electrodeposition (2013)
  • Author(s): F. Ichikawa, A. Shibata, H. Adachi, T. Yamasaki, N. Tsuji
  • Journal Title: Proceedings of the 8th Pacific Rim International Congress on Advanced Materials and Processing Volume: なし Pages: 3315-3322
  • Peer Reviewed
• [Presentation] 対称小傾角粒界を有する純アルミニウム双結晶の強度と圧縮方位の関係 (2012)
  • Author(s): 佐藤裕也, 柴田曉伸, 寺田大将, 樫原恵蔵, 辻伸泰
  • Organizer: 日本金属学会秋期講演大会
  • Place of Presentation: 愛媛大学
  • Year and Date: 2012-09-18