| Project/Area Number |
21560733
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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 |
Structural/Functional materials
|
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| Research Institution | National Institute for Materials Science |
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Principal Investigator |
TABUCHI Masaaki 独立行政法人物質・材料研究機構, 材料信頼性評価ユニット, グループリーダー (60354239)
|
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| Co-Investigator(Kenkyū-buntansha) |
HONGO Hiromichi 独立行政法人物質・材料研究機構, 材料情報ステーション, 主席エンジニア (40354237)
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| Project Period (FY) |
2009 – 2011
|
| Project Status |
Completed (Fiscal Year 2011)
|
| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2011: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2010: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2009: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Keywords | 高クロム耐熱鋼 / 溶接継手 / HAZ / クリープ / Type-IV損傷 / 粒界強化 / 構造材料 / 耐熱材料 / 高クロムフェライト系耐熱鋼 / 高効率火力発電プラント / 溶接 / ボロン / 高効率発電プラント / 二酸化炭素排出削減 / 高Crフェライト系耐熱鋼 |
|---|
| Research Abstract |
High chromium heat resisting steels are used for structural components of high-efficient thermal power plants. The degradation of high temperature strength of weldment during long-term use recently becomes a serious problem. In the present research, the processes and mechanisms of the damage and fracture of these steel welds at high temperatures were clarified. Further, new high chromium steels with higher grain boundary strength were developed. Creep lives of the developed steel welds were five times longer than the conventional high chromium steel welds, because creep damages formed on the grain boundaries were suppressed. Damage suppression mechanisms and life prediction equations in the developed steel welds were investigated.
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