Abstract
A novel series of Si-bearing, nearly Ni-free economical TRIP-aided duplex stainless steels (DSSs) 19Cr-5.5Mn-0.3Ni-0.2N-xSi (x = 0.5-2.5) have been prepared to investigate effect of silicon on microstructure, tensile mechanical property and high-temperature oxidation behavior. The results have shown that the designed economical alloys have a balanced ferrite/austenite dual-phase structure after suitable solution treatment. Volume of ferrite phase increases with an increase in silicon content. Ferrite deforms by dislocation slip during tensile plastic deformation process at room temperature. However, transformation-induced plasticity effect dominates deformation mode of metastable austenite phase. The designed DSS with 1.5 wt.% Si content exhibits good combination of tensile mechanical properties, exceeding 50% in elongation and 800 MPa in ultimate tensile strength, with a sequential γ → e-martensite → α′-martensite transformation in deformed austenite phase. High-temperature oxidation resistance of DSSs could be enhanced with an increase in silicon content at 1100 °C in air due to the formation of compact and continuous Cr- and Si-rich oxide film in the inner oxide film layer.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
