Brytan Zbigniew, Dagnaw Mengistu, Bidulská Jana, Bidulský Róbert, Muhamad Mohd Ridha
Department of Engineering Materials and Biomaterials, Faculty of Mechanical Engineering, Silesian University of Technology, 44-100 Gliwice, Poland.
Department of Plastic Deformation and Simulation Processes, Institute of Materials and Quality Engineering, Faculty of Materials Metallurgy and Recycling, Technical University of Kosice, Park Komenského 11, 04001 Kosice, Slovakia.
Materials (Basel). 2024 Jun 8;17(12):2807. doi: 10.3390/ma17122807.
This study examines the microstructural characteristics and corrosion resistance of super duplex stainless steel (SDSS) produced through laser powder bed fusion (LPBF). The analysis shows that the as-printed samples mainly exhibit a ferritic microstructure, which is due to the fast-cooling rates of the LPBF technique. X-ray and microstructure analyses reveal the presence of minor austenite phases in the ferritic matrix. The process of solution annealing led to a more balanced microstructure. Analyses of corrosion resistance, such as potentiodynamic polarization tests and EIS, indicate that heat treatment has a significant impact on the corrosion behavior of SDSS. Solution annealing and stress relieving at 400 °C for 1 h can improve corrosion resistance by increasing polarization resistance and favorable EIS parameters. However, stress relieving at 550 °C for 5 h may reduce the material's corrosion resistance due to the formation of chromium nitride. Therefore, stress relieving at 400 °C for 1 h is a practical method to significantly enhance the corrosion resistance of LPBF-printed SDSS. This method offers a balance between microstructural integrity and material performance.
本研究考察了通过激光粉末床熔融（LPBF）制备的超级双相不锈钢（SDSS）的微观结构特征和耐腐蚀性。分析表明，打印态样品主要呈现铁素体微观结构，这是由于LPBF技术的快速冷却速率所致。X射线和微观结构分析揭示了在铁素体基体中存在少量奥氏体相。固溶退火过程导致了更平衡的微观结构。耐腐蚀性分析，如动电位极化测试和电化学阻抗谱（EIS），表明热处理对SDSS的腐蚀行为有显著影响。在400°C下进行1小时的固溶退火和应力消除可通过提高极化电阻和有利的EIS参数来提高耐腐蚀性。然而，在550°C下进行5小时的应力消除可能会由于氮化铬的形成而降低材料的耐腐蚀性。因此，在400°C下进行1小时的应力消除是显著提高LPBF打印的SDSS耐腐蚀性的一种实用方法。该方法在微观结构完整性和材料性能之间提供了平衡。
