書誌事項
- タイトル別名
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- Investigation of the dominant factors of the strength of a grain boundary in Ni-base superalloy using molecular dynamics analysis
抄録
<p>In advanced thermal power plants, Ni-based superalloys with high temperature strength have been applied to components such as pressure pipes and vessels and turbine bledes. It was found that grain boundary cracking is caused in the alloy under creep loading due to the degradation of the crystallinity of grain boundaries and the grain boundary cracking degrades the lifetime of the alloy drastically. In this research, static and dynamic strains were applied to a bicrystal structure of the alloy perpendicularly to the grain boundary using molecular dynamics analysis. In addition, the effect of vacancies which appear in the area with high-density dislocation on the strength of the bicrystal structure was analyzed. It was found that plastic deformation, in other words, dislocations started to appear around the grain boundary in the bicrystal structure, and dislocatios diffused in the grain with higher Schmidt factor. The tensile strength of the bicrystal structure decreased by the introduction of vacancies of 1%, and and its fracture strain increased by about 50%. Therefore, the accumulation of vacancies was confirmed to decrease the effective strength of a grain boundary.</p>
収録刊行物
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- 計算力学講演会講演論文集
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計算力学講演会講演論文集 2019.32 (0), 074-, 2019
一般社団法人 日本機械学会
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詳細情報 詳細情報について
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- CRID
- 1390846609816268288
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- NII論文ID
- 130007817193
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- ISSN
- 24242799
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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
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可