Microstructure and Corrosion Resistance of Arc Additive Manufactured 316L Stainless Steel
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https: //doi. org/10.1007/s11595-020-2339-9
Microstructure and Corrosion Resistance of Arc Additive Manufactured 316L Stainless Steel YANG Ke1,2, WANG Qiuyu1,2, QU Yang1,2, JIANG Yongfeng1,2, BAO Yefeng1,2
(1.College of Mechanical and Electrical Engineering, Hohai University, Changzhou 213022, China; 2.Nantong Ocean and Coastal Engineering Research Institute, Hohai University, Nantong 226019, China) Abstract: The gas tungsten arc welding based additive manufacturing (GTAW-AM) was carried out by printing 316L austenitic stainless steel on carbon steel substrate with different arc currents (140, 160, 180 A). Microstructure and corrosion resistance of additive manufactured components were investigated. The results show that the microstructure of the GTAW-AM austenitic stainless steel is obviously changed by the arc current. With arc current increasing from 140 to 180 A, the austenite grains become coarse due to the effect of welding heat input. Meanwhile, the quantity of ferrites in the austenite matrix is decreased and the morphology transforms from lath to skeleton. Moreover, σ phases are finally formed under the arc currents of 180 A owing to high welding heat input. Therefore, as the microstructure transform into coarse-grained austenites, low-quantity ferrites and new-generated σ phases, the GTAW-AM austenitic stainless steel presents a significantly decrease in corrosion resistance. And the reduction of corrosion resistance is mainly due to the formation of σ phase as a result from consuming the large amounts of Cr element from the matrix. Key words: austenitic stainless steel; additive manufacturing; microstructure; corrosion resistance
1 Introduction In recent decades, with the development of society, the manufacturing methods have been constantly improved in the modern cutting-edge field. The processing requirements for metal parts in various industries have become increasingly stringent. Therefore, additive manufacturing (AM) technology has become research hotspots in many countries as soon as it emerged because of its advantages[1-3]. The additive manufacturing technology is a processing method by combining materials to fabricate desired components based on a three-dimensional (3D) computer aided design (CAD) model data[4]. Compared with traditional processing methods that are mainly for reducing the material production, additive manufacturing is a layered-stacked manufacturing technology which can fabricate more complicated parts with high-precision and high-efficiency[5].
© Wuhan University of Technology and Springer-Verlag GmbH Germany, Part of Springer Nature 2020 (Received: June 18, 2019; Accepted: May 12, 2020) YANG Ke(杨可): Prof.; Ph D; E-mail: [email protected] Funded by National Key Research and Development Program of China (No.2017YFE0100100), Fundamental Research Funds for the Central Universities (No.2018B59714) and Basic Research Program of Nantong (No.JC2019063)
Selective laser sintering (SLS), election beam melting (EBM) and electron beam freedom fabrication (EBF) are three i
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