1. School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
2. National Key Laboratory of Material Forming and Die Technology, Wuhan 430074, China
et al.
Duplex stainless steel (DSS) is widely used in marine, chemical and other fields due to its excellent comprehensive performance. The traditional method to manufacture DSS has the disadvantages of limited shape, high cost and low material utilization. The laser powder bed fusion (LPBF) technology has received increasingly attention due to its high accuracy and the ability to manufacture complex geometries, which provides a new way to prepare DSS with high performance and complex structure. The microstructure of DSS prepared by this method mainly consists of ferrite with fine grain (1~10 μm). The proportion of phases can be optimized by adjusting process parameters and heat treatment. LPBF DSS exhibits high hardness and tensile strength in terms of mechanical properties, but low ductility, fatigue strength and friction resistance which can be further improved by suitable heat treatment. Corrosion resistance of LPBF DSS is comparable to that of conventional DSS, with a thick passive film, but is significantly influenced by porosity and evaporation of alloy elements. Future research should focus on alloy design, process optimization and numerical simulation to improve the comprehensive performance of LPBF DSS and promote its extensive industrial applications in aerospace, petrochemical, energy and biomedical fields.