Exploring of ageing nature of materials at atomic scale

• Project/Area Number: 18K18953
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 26:Materials engineering and related fields
• Research Institution: Kyushu University
• Principal Investigator: Kaneko Kenji 九州大学, 工学研究院, 教授 (30336002)
• Project Period (FY): 2018-06-29 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000); Fiscal Year 2020: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2018: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
• Keywords: 鉄鋼材料 / 炭素クラスター / 合金 / 時効 / 電子顕微鏡 / 析出強化 / 透過型電子顕微鏡 / アルミニウム合金 / 時効メカニズム / 構造用金属材料 / 原子分解能電子顕微鏡

Outline of Final Research Achievements

The structure and properties of carbon-steel is strongly dependent on the amount of carbon as well as the form of carbon. When the carbon-steel is aged at low temperatures, the carbon clusters are usually formed and result in the increase strength of the carbon-steel. In this research, a TEM holder was developed for in-situ heating analysis for the aim of understanding the strengthening mechanism of carbon-steel with carbon clusters, and the generation/dispersion state and crystal structure of carbon clusters were examined. In addition, in-situ tensile experiment was carried out to observe the interaction between carbon clusters and dislocations.

Academic Significance and Societal Importance of the Research Achievements

透過型電子顕微鏡用の新ホルダーを開発することにより、その場加熱実験と高傾斜観察が可能となった。鉄鋼材料中における炭素クラスターの結晶学的知見を得ることに成功している。また、炭素クラスターと転位との相互作用を直接的に知見を得ることに成功している。今後、この観察法を他の合金材料などに適用することにより、その強化機構をナノスケールで解明することが可能となる。

Research Products

• [Journal Article] Formation of core-shell type structure in duplex martensitic steel (2021)
  • Author(s): K.Kaneko, T.Maeda, K.Ichino, Y.Kawahara, T.Masumura, T.Tsuchiyama, H.Shirahata and R.Uemori
  • Journal Title: Scripta Materialia Volume: 193 Pages: 112-116
  • DOI: 10.1016/j.scriptamat.2020.10.044
  • Peer Reviewed
• [Journal Article] Plan-view characterization of intergranular precipitates on grain boundaries by combination of FIB lift out method and TEM analyses: A case study in austenitic stainless steel (2020)
  • Author(s): Sato Kousei、Kaneko Kenji、Hara Toru、Kawahara Yasuhito、Hamada Jun-ichi、Takushima Chikako、Teranishi Ryo
  • Journal Title: Micron Volume: 138 Pages: 102927-102927
  • DOI: 10.1016/j.micron.2020.102927
  • Peer Reviewed
• [Journal Article] Novel nonlinear reconstruction method with grey-level quantisation units for electron tomography (2020)
  • Author(s): Baba Norio, Kaneko Kenji, Baba Misuzu
  • Journal Title: Science Report Volume: 10 Issue: 1 Pages: 20146-20161
  • DOI: 10.1038/s41598-020-77156-1
  • Peer Reviewed / Open Access
• [Journal Article] An answer to the carbon cluster in low-temperature aged ferritic low-carbon steel (2020)
  • Author(s): Maeda Takuya、Kawahara Yasuhito、Kinoshita Keisuke、Sawada Hideaki、Takahashi Jun、Teranishi Ryo、Kaneko Kenji
  • Journal Title: Materials Characterization Volume: 159 Pages: 110006-110006
  • DOI: 10.1016/j.matchar.2019.110006
  • Peer Reviewed
• [Journal Article] Solid Solution Hardening in Supersaturated Al-Mg-Si Alloy (2018)
  • Author(s): Takata Ken、Ushioda Kohsaku、Kaneko Kenji、Akiyoshi Ryutaro、Ikeda Ken-ichi、Hata Satoshi、Nakashima Hideharu
  • Journal Title: Journal of the Japan Institute of Metals and Materials Volume: 82 Issue: 8 Pages: 314-318
  • DOI: 10.2320/jinstmet.J2018015
  • NAID: 130007419049
  • ISSN: 0021-4876, 1880-6880, 2433-7501
  • Year and Date: 2018-08-01
  • Peer Reviewed / Open Access
• [Journal Article] Structural and compositional study of precipitates in under-aged Cu-added Al-Mg-Si alloy (2018)
  • Author(s): Maeda Takuya、Kaneko Kenji、Namba Takuya、Koshino Yuki、Sato Yukio、Teranishi Ryo、Aruga Yasuhiro
  • Journal Title: Scientific Reports Volume: 8 Issue: 1 Pages: 1-7
  • DOI: 10.1038/s41598-018-35134-8
  • Peer Reviewed / Open Access
• [Presentation] 時効温度による違いがAI-Mｇ-Si-Cu合金の微構造に及ぼす影響 (2019)
  • Author(s): 難波拓哉、佐藤幸生、寺西亮、金子賢治、宍戸久郎
  • Organizer: 日本顕微鏡学会九州支部講演会
• [Presentation] TEM内その場加熱による低炭素マルテンサイト鋼の析出物観察 (2019)
  • Author(s): 福尾洋介、金子賢治、土山聡宏、植森龍治、白幡浩幸、前田拓也
  • Organizer: 日本鉄鋼協会第178回秋季講演大会
• [Presentation] Nanoscale characterization of β” and Cu containing precipitates in a Cu added Al-Mg-Si alloy (2019)
  • Author(s): Maeda T., Koshino, Namba T., Aruga Y., Sato Y., Teranishi R., and Kaneko K.
  • Organizer: International Microscopy Congress 2019
  • Int'l Joint Research
• [Remarks] 九州大学大学院工学研究院材料工学部門 ナノ材料組織解析学・金子研究室
  • URL: http://zaiko13.zaiko.kyushu-u.ac.jp/