Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 532, Issue -, Pages 476-479Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2011.10.109
Keywords
Ferritic stainless steel; Corrosion properties; Friction stir welding; Si3N4 tool
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Funding
- WCU of the Korea Science & Engineering Foundation
- Korean Government (MOEHRD) [R32-2010-000-10124-0]
- National Research Foundation of Korea [R32-2010-000-10124-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Friction stir welding (FSW) was performed on 409L ferritic stainless steel using a silicon nitride (Si3N4) tool. FSW was performed at a tool rotation speed of 700 rpm and a travel speed of 60mm min(-1). In this study, the microstructural characteristics, mechanical properties, and corrosion properties in the weld were examined. The stir zone (SZ) had equiaxed grains with ferrite structures due to dynamic recrystallization. Any precipitates, such as Cr-carbide (CrxCy), were not observed in the SZ and heat affected zone (HAZ). The joint had similar intergranular corrosion resistance as that of the base metal (BM) due to the non-sensitive HAZ during welding. Also, the mass loss of the joint by pitting corrosion was similar to that of the BM. The mechanical properties in the weld were similar to that of the BM. In this regard, FSW is a proper welding process for 409L stainless steel. (C) 2011 Elsevier B.V. All rights reserved.
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