Effect of Interlayer Temperature on the Impact Toughness of Submerged Arc Additive Manufactured Duplex Stainless Steel
XUE Manye1, WU Shaojie1,2, CHENG Fangjie1,2,*
1 School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China 2 Tianjin Key Laboratory of Advanced Joining Technology, Tianjin 300350, China
Abstract: In the current work, duplex stainless steel (DSS) components were fabricated using submerged arc additive manufacturing (SAAM) with interlayer temperatures (Ti) set at 50 ℃ and 200 ℃, respectively. The influence of Ti on microstructure evolution and impact toughness was systematically analyzed here. The microstructure exhibits a layered structure consisting of intralayer and interlayer zones. The intralayer zone is mainly composed of closely arranged small diamond-shaped austenite, while the interlayer zone is mainly composed of Widmansttten austenite with random orientations at Ti of 50 ℃. This microstructure leads to an impact energy absorption of 70 J at -40 ℃. Conversely, at Ti of 200 ℃, the interlayer zone is mainly composed of coarse Widmansttten austenite parallel to the additive direction. This kind of Widmansttten austenite is more conducive to the nucleation and propagation of cracks, resulting in the impact absorption energy at -40 ℃ drops to 30 J. Therefore, the Ti of the SAAM of DSS should be strictly controlled to ensure the impact toughness. The current work provided a solid theoretical foundation for the efficient fabrication of large-scale DSS structural components using SAAM in fields such as nuclear power equipment and petrochemical engineering.
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2026, Vol. 40 
