Preparation and erosion resistance properties of 00Cr22Ni6MnMoCu duplex stainless steel

• The study optimized the alloy composition of the new material 00Cr22Ni6MnMoCu. • The erosion-corrosion wear resistance of 00Cr22Ni6MnMoCu is 14 times higher than that of DSS 2605 N. • The superior erosion-corrosion resistance of 00Cr22Ni6MnMoCu is primarily attributed to the near 1:1 vol fraction of austenite and ferrite phases, with a high austenite content. • Under shear stress from surface erosion wear, 00Cr22Ni6MnMoCu generates significant dislocation multiplication, leading to strong deformation strengthening. A detailed study was conducted to evaluate the erosion resistance and failure mechanisms of two materials, including a novel duplex stainless steel (DSS) 00Cr22Ni6MnMoCu and DSS 2605 N. ​Importantly, duplex stainless steels (DSS) such as 00Cr22Ni6MnMoCu and DSS 2605 N, are highly valued in erosion-resistant applications due to their unique microstructural and compositional characteristics. Moreover, 00Cr22Ni6MnMoCuhas been specifically engineered for enhanced resistance to erosion, abrasion, and corrosion. Its balanced ferrite-austenite microstructure, combined with alloying elements like chromium, nickel, molybdenum, manganese, and copper, contributes to its superior performance. The findings in this work are summarized as follows: (1) The 00Cr22Ni6MnMoCu alloy exhibited erosion resistance 14 times greater than that of 2605 N. Both materials displayed similar wear morphologies, characterized by mechanisms of cutting and corrosion. (2) The 00Cr22Ni6MnMoCu has an improved hardening ability. Following erosive testing, the 00Cr22Ni6MnMoCu duplex stainless steel exhibited a more pronounced transformation from austenite to martensite compared to the 2605 N alloy. This increased phase transformation indicates a superior hardening capacity in 00Cr22Ni6MnMoCu, which correlates with its enhanced erosion resistance. The strain-induced martensitic transformation contributes to the material's ability to withstand erosive environments more effectively. The significant difference in volume fractions between ferrite and austenite phases, along with the lower austenite content in 2605 N, leads to increased interphase stress during erosion, leading to the reduced erosion resistance observed in 2605 N. These insights highlight the importance of phase balance and transformation behaviors in enhancing the erosion resistance of duplex stainless steels.