2012 Fiscal Year Final Research Report
Understanding initiation processes of stress corrosion cracking by means of real time imaging and development of anti-SCC materials
| Project/Area Number |
22246092
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Material processing/treatments
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| Research Institution | Tohoku University |
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Principal Investigator |
WATANABE Yutaka 東北大学, 大学院・工学研究科, 教授 (10260415)
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| Co-Investigator(Kenkyū-buntansha) |
TAKEDA Yoichi 東北大学, 大学院・工学研究科, 准教授 (40374970)
OIKAWA Katsunari 東北大学, 大学院・工学研究科, 准教授 (70356608)
ABE Hiroshi 東北大学, 大学院・工学研究科, 助教 (30540695)
MIYAZAKI Takamichi 東北大学, 大学院・工学研究科, 技術職員 (20422090)
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| Project Period (FY) |
2010 – 2012
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| Keywords | 応力腐食割れ / 発生過程 / 視覚化 / すべり溶解機構 / 発色反応 / δフェライト / オーステナイト系ステンレス鋼 / き裂停留 |
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| Research Abstract |
A visualization method has been developed, where local and transient anodic events occurring in initiation processes of stress corrosion cracking can be observed in a wide window and in real time. The initiation process was found to be intermittent and very small-scale anodic events and their repassivation. Cracks tend to initiate at the location where a few anodic events occur in proximity to each other. In most cases, oxide inclusions containing Si, Mg, or Al, provided initiation sites. Stress corrosion cracks tend to retard when they reach δ-ferrite located on grain boundaries (especially on triple points). We may be able to effectively improve SCC initiation life of steels by locatingδ-ferrite on grain boundaries as much as up to a few % of volume fraction.
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