An Overview on Additive Manufacturing of Duplex Stainless Steels: Microstructure, Mechanical Properties, Corrosion Resistance, Postheat Treatment, and Future Perspectives

Additive manufacturing (AM) is a cutting-edge technique for constructing intricate components with unique microstructural features and strength comparable to wrought alloys. Due to their exceptional corrosion resistance and mechanical properties, duplex stainless steels (DSS) are used in a wide range of critical applications. Over the past several years, a substantial body of research has been conducted on the AM of DSS. In-depth knowledge is required to understand the complete benefits of the AM process. This review overviews the AM-processed DSS parts based on process-specific microstructural changes, mechanical behavior, electrochemical performance, and postheat treatment processes based on the classifications of directed energy deposition and powder bed fusion AM techniques along with future perspectives. Major challenges in AM of DSS are optimizing the austenite-ferrite fractions and controlling the formations of deleterious phases. This review will be extensively useful to researchers and industries working in the AM of DSS. Duplex stainless steel (DSS) parts made using additive manufacturing (AM) exhibit promising characteristics due to process-specific microstructural changes, mechanical properties, electrochemical performance, and post-heat treatment processes. The AM methods for DSS parts fabrication mainly include directed energy deposition and powder bed fusion. Significant challenges in AM of DSS involve optimizing austenite-ferrite ratios and controlling deleterious phase formations.image (c) 2024 WILEY-VCH GmbH