書誌事項
- タイトル別名
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- Grain Boundary Cracking Mechanism in Ni-base Alloy 617 Under Creep-fatigue Loading at Elevated Temperatures
抄録
<p>The operating temperature of advanced thermal power plants is increasing continuously to improve their thermal efficiency to reduce the emission of CO2. Under the creep and creep-fatigue conditions at elevated temperature, however, the effective lifetime of heat-resistant alloy such as Ni-base Alloy 617 which has high strength and good corrosion resistance at about 750oC was found to decrease drastically. Main reason for this short lifetime is attributed to the change in the crack initiation and propagation paths from trasgranular one to intergranular one. It is, therefore, important to clarify the criteria of the grain boundary cracking quantitatively. In this study, electron back-scatter diffraction (EBSD) was applied to the analysis of the degradation process of the quality of grain boundaries in the alloy. The change in the crystallinity of grains and grain boundaries were continuously monitored during creep and creep-fatigue tests. It was found that accumulation of vacancies and dislocations degrades the crystallinity of grain boundaries and thus, their strength. The accumulation occurred around the specific grain boundaries which consisted of grains with large difference of Schmid factor and initial crystallinity which was defined by image quality (IQ) value obtained from the EBSD analysis.</p>
収録刊行物
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- M&M材料力学カンファレンス
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M&M材料力学カンファレンス 2019 (0), PS13-, 2019
一般社団法人 日本機械学会
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キーワード
詳細情報 詳細情報について
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- CRID
- 1390285300159566336
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- NII論文ID
- 130007846726
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- ISSN
- 24242845
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
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- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可