書誌事項
- タイトル別名
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- Numerical Analysis of Precipitation Strengthening by γ-Precipitates in Nickel-Based Superalloy
- ニッケルキ チョウゴウキン チュウ ノ ガンマ セキシュツブツ ニ ヨル セキシュツ キョウカ キコウ ノ スウチ カイセキ
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抄録
Precipitation strengthening is one of the effective techniques to design highly strengthened alloys. Up till now, many researchers have attempted to develop a concept that describes the strengthening effect of precipitates, and however, that contains a lot of assumptions, such as that the shape of dislocation is straight and the width of dislocation core is ignored. Recently, 3-D atom probe experiments have found the formation of γ-precipitates in γ' phases in nickel-based superalloy. Also, tensile tests have revealed that the γ-precipitates have an influence on the precipitation strengthening. In this paper, the interaction between a spherical γ-precipitate and a super-dislocation, which is a pair of two perfect dislocations, is investigated using an atomistic-continuum hybrid method. The strengthening due to the γ-precipitates is decomposed into two different strengthening mechanisms, such as stacking-fault and coherency strengthening mechanisms. We successfully simulated the interaction between the dislocation and the γ-precipitate, and focused on the role of the flexibility of dislocation and the dislocation core in the strengthening mechanism. Finally we propose an equation for the coherency strengthening based on an idea of stacking fault width in the dislocation core. The equation provides an excellent evaluation of improvements of the material strength by the strengthening mechanism.
収録刊行物
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- 日本機械学会論文集Ａ編
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日本機械学会論文集Ａ編 75 (753), 595-603, 2009
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
- 1390282679454004352
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- NII論文ID
- 110007226508
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- NII書誌ID
- AN0018742X
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- ISSN
- 18848338
- 03875008
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- NDL書誌ID
- 10318826
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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
- NDL
- Crossref
- CiNii Articles
- KAKEN
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- 抄録ライセンスフラグ
- 使用不可