| Project/Area Number |
16201015
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Environmental technology/Environmental materials
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| Research Institution | IBARAKI UNIVERSITY |
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Principal Investigator |
TOMOTA Yo IBARAKI University, Graduate School of Science and Engineering, Professor, 理工学研究科, 教授 (90007782)
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| Co-Investigator(Kenkyū-buntansha) |
TAKAHASHI Haruyuki IBARAKI University, Graduate School of Science and Engineering, Professor, 理工学研究科, 教授 (30202154)
NISHINO Souichiro IBARAKI University, Graduate School of Science and Engineering, Lecturer, 理工学研究科, 講師 (00272112)
SUZUKI Tetsuya IBARAKI University, College of Engineering, Associate Professor, 工学部, 助教授 (70261740)
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| Project Period (FY) |
2004 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥47,450,000 (Direct Cost: ¥36,500,000、Indirect Cost: ¥10,950,000)
Fiscal Year 2006: ¥8,190,000 (Direct Cost: ¥6,300,000、Indirect Cost: ¥1,890,000)
Fiscal Year 2005: ¥12,480,000 (Direct Cost: ¥9,600,000、Indirect Cost: ¥2,880,000)
Fiscal Year 2004: ¥26,780,000 (Direct Cost: ¥20,600,000、Indirect Cost: ¥6,180,000)
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| Keywords | neutron diffraction / nano-structure / ecomaterial / steel / in situ measurement / small angle scattering / microstructure control / mechanical properties / 中性子回折 / 中性子散乱 / ナノ組織制御 / 強塑性加工 / 加工熱処理 / 短範囲規則化 |
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| Research Abstract |
Microstructure evolution and strengthening mechanisms of severely drawn steel wires with various carbon concentrations up to 0.9 mass% were examined by means of neutron scattering. Texture, Intergranular stress, grain size and dislocation density were analyzed by a profile analysis for neutron diffraction, which was newly developed in this study. The grain size of 0.9C steel becomes several ten nanometers that is consistent with TEM observations. The merits to use neutron diffraction is to obtain bulky averages of micro-factors which are well connected with mechanical behavior. The mutli-scaled heterogeneity in microstructure as well as deformation behavior of as-patented pearlite and its drawn wires have been made clear.
Phase transformation behaviors of steels were studied in situ by neutron diffraction. The in situ diffraction during athermal martensitic transformation in a 30Ni-0.2C steel during cooling and tempering reveals the change in c/a of bct martensite with low temperature t
… More
empering. Diffusional transformation from martensite to austenite upon heating and then austenite to ferrite and pearlite transformations was studied in situ and carbon enrichment, lattice strain (internal strain), volume fraction etc can be found. Thermo-mechanically controlled process was firstly investigated under neutron diffraction. The effect of austenite deformation on phase transformation and grain refinement are discussed by using direct experimental data.
Nano-scaled nitrogen ordered zone was evaluated by small angle scattering in austenitic stainless steels with several amounts of nitrogen contents. In situ neutron scattering was performed for large angle (Bragg) and small angle neutron diffraction and the intergranular stress and destroy of short range ordering were found. These new findings have revealed the mechanisms of high performance in nitrogen bearing steels.
These materials are all aimed at realizing ecomaterials and further related investigations have been started based on the present results. Less
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