Effects of inclusions on the precipitation of chi phases and intergranular corrosion resistance of hyper duplex stainless steel |
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| Affiliation: | 1. School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China;2. School of Management, University of Shanghai for Science and Technology, Shanghai 200093, China;3. Department of Materials Science, Fudan University, Shanghai 200433, China;1. Nuclear Materials Research Division, Korea Atomic Energy Research Institute, Republic of Korea;2. Department of Advanced Materials Engineering, Chungnam National University, Republic of Korea;3. Central Research Institute of Korea Hydro & Nuclear Power Co., Ltd, Republic of Korea;1. Terra&AcquaTech Laboratory, University of Ferrara, Via Luigi Borsari 46, Ferrara 44121, Italy;2. Corrosion and Metallurgy Study Centre “Aldo Daccò”, Engineering Department, University of Ferrara, G. Saragat 1, Ferrara 44122, Italy;1. Department of Materials Science, Fudan University, Shanghai 200433, China;2. School of Information and Electrical Engineering, Zhejiang University City College, Zhejiang 310015, China;1. Oregon State University, 204 Rogers Hall, Corvallis, OR 97331, USA;2. Oak Ridge National Laboratory, PO Box 2008, Oak Ridge, TN 37831-6139, USA;3. Knolls Atomic Power Laboratory, PO Box 1072, Niskayuna, NY 12309, USA |
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| Abstract: | During the initial stage of aging heat treatment at 850 °C, inclusions such as (Cr, Mn, Al) oxides and (Cr, Mn, Al, Fe) oxides of a hyper duplex stainless steel act as preferential precipitation sites for the chi phase like ferrite/austenite phase boundaries and ferrite/ferrite grain boundaries. The chi phase is precipitated around the inclusions due to the blocking and piling up the alloying elements such as Mo and W around the inclusions. The precipitation of Mo and W enriched chi phase around the inclusions decreases the intergranular corrosion resistance due to the formation of Mo and W depleted zones. |
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| Keywords: | A Stainless steel B EPMA C Inclusion C Intergranular corrosion |
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