2011 Fiscal Year Final Research Report
Development of strengthening technique of heat resisting structural materials for the next generation power plant with decreased carbon dioxide emission
| 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
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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 |
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| 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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