A new alloy design concept for high-corrosion resistant steels based on micro-electrochemistry of local dissolution and repassivation
| Project/Area Number |
17H01331
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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/Microstructural control engineering
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| Research Institution | Tohoku University |
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Principal Investigator |
Muto Izumi 東北大学, 工学研究科, 教授 (20400278)
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| Co-Investigator(Kenkyū-buntansha) |
菅原 優 東北大学, 工学研究科, 准教授 (40599057)
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥44,460,000 (Direct Cost: ¥34,200,000、Indirect Cost: ¥10,260,000)
Fiscal Year 2019: ¥12,220,000 (Direct Cost: ¥9,400,000、Indirect Cost: ¥2,820,000)
Fiscal Year 2018: ¥13,390,000 (Direct Cost: ¥10,300,000、Indirect Cost: ¥3,090,000)
Fiscal Year 2017: ¥18,850,000 (Direct Cost: ¥14,500,000、Indirect Cost: ¥4,350,000)
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| Keywords | 耐食材料 / 腐食防食 / 炭素鋼 / ステンレス鋼 / 孔食 / 介在物 / 局部腐食 |
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| Outline of Final Research Achievements |
The initiation sites and morphology during the early stage of pitting on pearlite strucure were investigated. Pits were initiated in the ferrite lamellae and proceeded along the ferrite lamellae. Cementite acts as a barrier against the pit growth. In as-quenched and tempered martensitie, interstitial carbon was found to improve pitting corrosion resistance. Short-time tempering of martensite was suggested to be a feasible approach to striking an optimal balance between facilitating corrosion resistance and achieving the desired mechanical properties . For stainless steels, the addition of inhibitor to sulfide inclusions was determined to improve pitting corrosion resistance at sulfide inclusions. It was demonstrated that Ce3+ ions are likely to be produced by the dissolution of Ce-containing inclusions, and the Ce3+ ions inhibit trench formation at the sulfide/steel matrix boundary, resulting in improved pitting corrosion resistance at sulfide inclusions.
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| Academic Significance and Societal Importance of the Research Achievements |
耐孔食性に優れる鋼を開発するためには、材料表面に点在する腐食起点を特定し、そのうえでミクロな視点から高耐食化のための知見を見出すことができる新技術の開発に成功した。さらに、孔食が自発的に成長を開始する前に、溶解を停止させる技術を見出した。高合金化に代わる新しい原理であり、省資源高耐食鋼を開発する基盤技術になるものと期待される。特に、固溶炭素と鉄炭化物が鋼の高耐食化に寄与することを、マイクロメートルオーダー視点から解明したことは意義深い。輸送用機器などの軽量化に不可避な高強度鋼の高耐食化に応用可能である。
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Report
(4 results)
Research Products
(84 results)
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[Journal Article] First-principles analysis of the inhibitive effect of interstitial carbon on an active dissolution of martensitic steel2020
Author(s)
Mariko Kadowaki, Arkapol Saengdeejin, Izumi Muto, YingChen, Hiroyuki Masuda, Hideki Katayama, Takashi Doi, Kaori Kawano, Hideo Miura, Yu Sugawara, Nobuyoshi Hara
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Journal Title
Corrosion Science
Volume: 163
Pages: 108251-108251
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] Roles of Interstitial Nitrogen, Carbon, and Boron in Steel Corrosion: Generation of Oxyanions and Stabilization of Electronic Structure2020
Author(s)
Mariko Kadowaki, Arkapol Saengdeejing, Izumi Muto, Ying Chen, Gerald S. Frankel, Takashi Doi, Kaori Kawano, Yu Sugawara, Nobuyoshi Hara
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Journal Title
Journal of The Electrochemical Society
Volume: 167
Issue: 8
Pages: 081503-081503
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Presentation] 第一原理計算を用いたマルテンサイト鋼の耐食性におよぼす固溶炭素影響解明2019
Author(s)
門脇万里子, Arkapol Saengdeejing, 武藤 泉, 陳 迎, 升田博之, 片山英樹, 土井教史, 河野佳織, 三浦英生, 菅原 優, 原 信義
Organizer
(公社)日本金属学会 2019年秋期(第165回)講演大会
Related Report
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[Presentation] First-Principles Investigation of the Effect of Interstitial Carbon on Corrosion Resistance of Martensitic Medium-Carbon Steel2019
Author(s)
Mariko Kadowaki, Arkapol Saengdeejing, Izumi Muto, Ying Chen, Hiroyuki Masuda, Hideki Katayama, Takashi Doi, Kaori Kawano, Hideo Miura, Yu Sugawara, Nobuyoshi Hara
Organizer
236th ECS Meeting
Related Report
Int'l Joint Research
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[Patent(Industrial Property Rights)] Ce含有耐食鋼2019
Inventor(s)
西本昌史, 武藤 泉, 菅原 優, 原 信義
Industrial Property Rights Holder
西本昌史, 武藤 泉, 菅原 優, 原 信義
Industrial Property Rights Type
特許
Industrial Property Number
2019-221583
Filing Date
2019
Related Report
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