Arrest of Intergranular Corrosion in Austenitic Stainless Steel by Twin-induced Grain Boundary Engineering(Student Poster Session)
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概要
- 論文の詳細を見る
Sensitization by chromium depletion due to chromium carbide precipitation at grain boundaries in austenitic stainless steels can not be prevented perfectly only by existing conventional techniques, such as reduction of carbon content, stabilization-treatment, local solution-heat-treatment, etc. In this investigation, a thermomechanical treatment was tried to improve the resistance to the sensitization by grain boundary engineering (GBE). A type 304 austenitic stainless steel was cold-rolled and solution-heat-treated, and then sensitization-heat-treated. The grain boundary character distribution was examined by orientation imaging microscopy (OIM). The intergranular corrosion resistance was evaluated by electrochemical potentiokinetic reactivation (EPR) and ferric sulfate-sulfuric acid tests. The sensitivity to intergranular corrosion was reduced by the thermomechanical treatment and indicated a minimum at a small roll-reduction. The frequency of coincidence-site-lattice (CSL) boundaries indicated a maximum at the small reduction. The ferric sulfate-sulfuric acid test showed much smaller corrosion rate in the thermomechanical-treated specimen than in the base material. A high density of annealing twins were observed in the thermomechanical-treated specimen. The results suggest that the thermomechanical treatment can introduce low energy segments in the grain boundary network by annealing twins and can arrest the percolation of intergranular corrosion from the surface.
- 一般社団法人日本機械学会の論文
- 2001-10-20
著者
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SATO Yutaka
Department of Biological Mechanisms and Functions, Graduate School of Bioagricultural Sciences, Nago
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Kokawa Hiroyuki
Department of Materials Processing, Graduate School of Engineering, Tohoku University
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Wang Zhan
Department of Materials Science, Graduate School of Engineering, Tohoku University
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SHIMADA Masayuki
Department of Chemistry, Faculty of Science, Kagoshima University
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Wang Zhan
Department Of Histoembryology China Medical University:no. 2 Laboratory Of Electron Microscopy China
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Kokawa Hiroyuki
Department Of Materials Processing Faculty Of Engineering Tohoku University
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Kokawa Hiroyuki
Department Of Materials Processing Graduate School Of Engineering Tohoku University
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Wang Zhan
Department Of Materials Science Graduate School Of Engineering Tohoku University
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Sato Yutaka
Department Of Biological Mechanisms And Functions Graduate School Of Bioagricultural Sciences Nagoya
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Sato Yutaka
Department Of Materials Processing Graduate School Of Engineering Tohoku University
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Shimada Masayuki
Department Of Materials Processing Graduate School Of Engineering Tohoku University
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Shimada Masayuki
Department Of Animal Reproduction Faculty Of Applied Biological Science Hiroshima University
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Sato Yutaka
Department Of Biochemistry And Oral Health Science Center Tokyo Dental College
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Sato Yutaka
Department of Applied Physics, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
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