initiation and propagation of intergranular stress corrosion cracking
Project/Area Number |
17H04899
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Research Category |
Grant-in-Aid for Young Scientists (A)
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Allocation Type | Single-year Grants |
Research Field |
Materials/Mechanics of materials
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Research Institution | Shizuoka University |
Principal Investigator |
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Project Period (FY) |
2017-04-01 – 2021-03-31
|
Project Status |
Completed (Fiscal Year 2020)
|
Budget Amount *help |
¥24,440,000 (Direct Cost: ¥18,800,000、Indirect Cost: ¥5,640,000)
Fiscal Year 2020: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2019: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2018: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2017: ¥16,250,000 (Direct Cost: ¥12,500,000、Indirect Cost: ¥3,750,000)
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Keywords | 応力腐食割れ / 粒界 / 応力 / ひずみ / 応力拡大係数 / ステンレス鋼 / き裂 / 粒界腐食 / 電気化学ノイズ / その場観察 / 環境強度 / 微視組織 / 転位密度 / き裂発生 / き裂進展 / 粒界性格 |
Outline of Final Research Achievements |
The present study elucidated the processes of SCC initiation and growth in stainless steels subjected to tension in a corrosive environment to evaluate their SCC life. SCC initiates and grows at grain boundaries (GBs) with high susceptibility to intergranular corrosion. Crack initiation is characterized by normal strain at a GB on the surface of the material, which is caused by stress/strain concentration due to dislocation pile-up near GBs under tensile loading. Crack propagation rate can be formulated using the stress intensity factor K and its gradient dK/da.
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Academic Significance and Societal Importance of the Research Achievements |
本研究では,ステンレス鋼に生じるSCCの発生および進展条件を明らかにした.SCCの発生には,力学および粒界構造に関する条件が必要であり,それらを排除することで耐SCC性を有する材料の設計に生かすことが可能である.さらに,SCC進展式を提案したことから,高精度な寿命予測が可能となる.これらの結果は,高経年化した機械構造物の健全性確保に資する.
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Report
(5 results)
Research Products
(16 results)