Elucidation of damage mechanism of high temperature fatigue material by nano meso macro strength analysis
| Project/Area Number |
23560110
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | National Institute for Materials Science |
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Principal Investigator |
NAGASHIMA NOBUO 国立研究開発法人物質・材料研究機構, 構造材料研究拠点 疲労研究グループ, 主幹研究員 (30354252)
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| Co-Investigator(Kenkyū-buntansha) |
早川 正夫 国立研究開発法人物質・材料研究機構, 構造材料研究拠点 疲労研究グループ, グループリーダー (50354254)
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| Project Period (FY) |
2011-04-28 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2014: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2013: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2012: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2011: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Keywords | ferritic Cr-W steel / tempered martensite / coarse block / grain boundary / creep-fatigue / nano-indentation / pop-in behavior / coase subgrain / nanoindentation / pop-in / クリープ疲労 / ナノインデンテーション / 粗大サブグレイン / 国際情報交換 / 国際情報交流 |
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| Outline of Final Research Achievements |
Nano indentation were performed for 12Cr-2W ferritic heat-resisting steels. One of the 12Cr-2W with superior creep-fatigue property showed transgranular fractures, whereas the other steel with inferior creep-fatigue property did intergranular fractures. In the inferior steel,the coares blocks neighboring the prior austenite grain boundaries were fomed during the creep-fatigue testing. Nano-scale hardness of the blocks neighboring the grain boundaries were markdely became less than those of the fine blocks inner grains after the tests. Moreover, a pop-in behavior occurred at only the coarse blocks neighring the grain boundaries. The pop-in behavior indicates that the dislocation density in the coarse blocks should be extremely lower by the recovery or rearrangement of dislocation by the creep-fatigue process at high-temperature. Therefore local deformations were assisted in the coarse blocks neighboring to grain boundaries and introduce the intergranular fractures.
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Report
(7 results)
Research Products
(24 results)
