| Project/Area Number |
20360318
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Structural/Functional materials
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| Research Institution | National Institute for Materials Science |
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Principal Investigator |
SAWAGUCHI Takahiro National Institute for Materials Science, 主幹研究員 (30354161)
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| Co-Investigator(Kenkyū-buntansha) |
OGAWA Kazuyuki 独立行政法人物質・材料研究機構, 新構造材料センター, フレッシュキャリア (60370318)
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| Project Period (FY) |
2008 – 2010
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| Project Status |
Completed (Fiscal Year 2010)
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| Budget Amount *help |
¥19,110,000 (Direct Cost: ¥14,700,000、Indirect Cost: ¥4,410,000)
Fiscal Year 2010: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2009: ¥6,110,000 (Direct Cost: ¥4,700,000、Indirect Cost: ¥1,410,000)
Fiscal Year 2008: ¥7,670,000 (Direct Cost: ¥5,900,000、Indirect Cost: ¥1,770,000)
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| Keywords | 耐震・耐環境材料 / マルテンサイト変態 / 双晶変形 / 原子間力顕微鏡 / 透過型電子顕微鏡 / 降伏応力 / 変形双晶 / 電子線後方散乱回折 |
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| Research Abstract |
We investigated the effect of deformation modes on the proof stress of high-Mn austenitic steels. Commodities and differences among three plastic deformation mechanisms, i.e., deformation-induced γ→ε martensitic transformation, γ deformation twinning and slip deformation, are discussed in their nucleation, development and the effect on mechanical properties. They are commonly formed on the closely-packed {111} planes by the shear-type displacement and thus exhibit plate-like morphologies. They are described by regularly overlapping stacking faults. On the other hand, macroscopic properties such as the proof stress of polycrystal alloys are determined by the onset stress and a variety of microstructural interactions of the plates, which are differently affected by the existence/absence of the phase transformation, the stacking fault energy and the distribution of the plate nucleation sites.
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