Abstract
Duplex stainless steel (DSS) is used for desalination equipment, pressure vessels, marine applications, offshore applications, and in oil/gas plants where a highly corrosive environment is present. Super duplex stainless steel (SDSS) 2507 has excellent mechanical properties, such as high strength, high toughness, high fatigue life, and high corrosion resistance. Friction stir processing (FSP) is used to refine the grain structure of the processed region such that properties like strength, hardness, fracture toughness, fatigue life, and corrosion resistance are enhanced. In this paper, an optimized friction stir process of 2507 SDSS is carried out to refine the microstructure of the material in order to improve its mechanical properties. Microstructure analysis revealed that grains were refined from a size of around 160 µm in the base material to 2–30 µm in the processed zone. This grain size reduction resulted in improved strength, hardness, and fracture toughness of the material by up to 14%, 11%, and 12%, respectively. However, FSP has reduced the fracture strain by about 30%.
Highlights
Duplex stainless steel (DSS) is composed of ferritic (α-phase) and austenitic (γ-phase)
Friction stir processing (FSP) is the modification of friction stir welding (FSW) and used to modify the behavior of the material, whereas FSW is used for the joining of metals
277x throughout the there processing section shown along the section oftaken the FSPed
Summary
Duplex stainless steel (DSS) is composed of ferritic (α-phase) and austenitic (γ-phase). DSS belongs to the family of stainless steel and has austenite and ferrite in almost equal amounts. Friction stir processing (FSP) is a solid-state surface treatment technique in which the tool’s pin is inserted inside the material for processing. FSP is the modification of friction stir welding (FSW) and used to modify the behavior of the material, whereas FSW is used for the joining of metals. During FSP, severe plastic deformation takes place and a tool mechanically stirs the material to modify its microstructure by refinement of the microstructure through dynamic recrystallization [3]. Refinement of the microstructure affects properties like the strength, hardness, fatigue behavior, and corrosion resistance of the SDSS. FSP has influence on the properties of the material [4] and, strength and fracture toughness are expected to be enhanced
Sign-in/Register to view highlights & summary 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.
