Study on the effect of solution treatment on mechanical and corrosion properties of SAF 2507DSS produced by LPBF

Abstract

In recent years, the application of Laser powder bed fusion (LPBF) technology in the manufacturing industry has become increasingly widespread. Compared to traditional casting processes, LPBF technology allows for the production of complex-shaped and structurally unique components made of 2507 duplex stainless steel (2507DSS), thus improving production efficiency and product quality. This article focuses on determining the LPBF parameters required for printing 2507DSS, successfully fabricating samples with a density of 98.71% and subjecting them to solution treatment followed by tensile testing. The results show that the LPBF-prepared samples exhibit a strength of 1173 MPa and an elongation of 18%. The presence of island-like structures enables excellent mechanical performance in the horizontal direction. The samples subjected to solution treatment at 1100 °C exhibit a strength of 860 MPa and an elongation of 45%. It is observed that when 2507DSS undergoes solution treatment from a single-phase state, the formation of large-angle grain boundaries and residual stresses within the austenite phase occurs, and a reasonable explanation is provided. Furthermore, the article conducts electrochemical tests on the samples. The results indicate that the LPBF-prepared samples possess the same electrochemical properties as the samples treated at 1100 °C, and both outperform the cast samples. Thus, this study reveals that the proportion of phases is not the sole determining factor for the corrosion resistance of DSS, providing valuable insights for the future development of more corrosion-resistant 2507DSS materials.