Effect of Solution Treatment on Microstructure and Wear Resistance of Directed Energy Deposited Super Duplex Stainless Steel

A multi-layer single-pass wall deposition experiment was conducted using ER2594 super duplex stainless steel welding wire with a diameter of 1.2 mm. The additively manufactured specimens were subjected to solution treatment at temperatures of 1 050, 1 150 and 1 250 ℃, followed by reciprocating friction and wear tests. The experimental results revealed that with the increase in solution treatment temperature, the ferrite content in the duplex phase increased, leading to a corresponding increase in microhardness. Furthermore, the solution treatment effectively reduced the internal stresses in the additively manufactured components. Ultimately, based on the synergistic effect of higher hardness and lower internal stresses, the specimen treated at 1 250 ℃ exhibited superior wear resistance in the friction and wear tests. The wear resistance of the samples after heat treatment were effectively improved. In summary, the findings of this study highlighted the importance of solution treatment temperature in determining the microstructural and mechanical properties of additively manufactured super duplex stainless steel components. By optimizing the solution treatment conditions, it was possible to improve the wear resistance of these components, thereby enhancing their overall performance in various applications.