| Project/Area Number |
20560621
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Physical properties of metals
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| Research Institution | National Institute for Materials Science |
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Principal Investigator |
NAGASHIMA Nobuo National Institute for Materials Science, 材料信頼性センター, 主任研究員 (30354252)
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| Co-Investigator(Kenkyū-buntansha) |
HAYAKAWA Masao 独立行政法人物質・材料研究機構, 材料信頼性センター, 主任研究員 (50354254)
ADACHI Yoshitaka 独立行政法人物質・材料研究機構, 材料信頼性萌芽ラボ, 主幹研究員 (90370311)
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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 |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2010: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2009: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2008: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Keywords | 応力腐食割れ(SCC) / 微小硬さ / 原子間力顕微鏡 / SEM / EBSD / 平面ひずみ / 微小硬さ試験 / 電子後方散乱解析(EBSD) / 応力腐食割れ / 小型引張試験 |
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| Research Abstract |
For the purpose of measuring strain distribution of the crack tip, the relations of the hardness and the strain were demanded. The hardness measurement performed Micro Vickers test (macrohardness), a microhardness test (meso hardness), nanoindentation test (nanohardness). As a result, it was evident that a microhardness examination was suitable for a measurement of the plasticity strain distribution of the crack tip. The crack propagation test out in air which simulated SCC crack propagation test was carried out. Crack tip of a provided specimen is plane strain condition. The strain distribution of the crack tip was able to be measured by the hardness distribution measurement of the microhardness test. In addition, as a result of having performed EBSD analysis about the crack tip of the specimen, a local direction difference produced the random grain boundary in the plastic deformation domain only in crack tip, and a local site direction difference didn't produce it in 3 Σ correspondence grain boundaries.
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