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Title:: Research Advance in Preparation of Duplex Stainless Steel by Laser Powder Bed Melting Technology

作者:: 潘萬楓; 李尚; 張健; 董選普; 劉鑫旺; 計效園; 向紅亮; 曹華堂; 1華中科技大學材料科學與工程學院，湖北武漢 430074 2材料成形與模具技術全國重點實驗室，湖北武漢 430074 3福州大學機械工程及自動化學院, 福建福州350108 4三明醫學科技職業學院, 福建三明 365000

Author(s):: Pan Wanfeng; Zhang Jian; Li Shang; Dong xuanpu; Liu Xinwang; Ji Xiaoyuan; Xiang Hongliang; Cao Huatang; 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.

Keywords:: Laser powder bed fusion; Duplex stainless steel; Mechanical properties; Tribological properties; Corrosion resistance

摘要:: 雙相不銹鋼（Duplex stainless steel，DSS）因其優異的綜合性能，在海洋、化工等領域得到廣泛應用。傳統方法制造DSS具備形狀受限、成本高、材料利用率較低的缺點，激光粉末床熔融（Laser powder bed fusion，LPBF）技術因其高精度和制造復雜幾何形狀的能力而備受關注，為制備高性能、復雜結構的雙相不銹鋼提供了新的途徑。該方式制備的雙相不銹鋼微觀結構以鐵素體為主，晶粒細小（1-10 μm），通過調整工藝參數和熱處理可優化兩相比。力學性能方面表現出高硬度和抗拉強度，但延展性和疲勞強度較低，可通過合適熱處理進一步改善。耐腐蝕性與傳統雙相不銹鋼相當，其鈍化膜較厚，但受孔隙和合金元素蒸發的影響較大。未來研究應聚焦于合金設計、工藝優化和數值模擬，以進一步提升LPBF-DSS的綜合性能并推動其在航空航天、石油化工、能源及生物醫療等領域的廣闊工業化應用。

Abstract:: 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. Mechanical properties include high hardness and tensile strength, but low ductility and fatigue strength, 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 such as in aerospace, petrochemical, energy and biomedical fields.