|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Ultrafine Grained Materials IX
||Fracture Toughness of a Duplex Steel Deformed by High Pressure Torsion
||Katharina Theresia Schwarz, Anton Hohenwarter, Reinhard Pippan
|On-Site Speaker (Planned)
||Katharina Theresia Schwarz
Duplex steels are two phase steels with relatively equal amounts of ferrite and austenite. They are known for their superior resistance to localized corrosion, stress corrosion and their excellent combination of high strength and fracture toughness. Ultrafine-grained and nanocrystalline metals have also shown improved mechanical and physical properties compared to their coarse grain counterparts. For this reason the material could be further optimized by nanostructuring. A conventional duplex steel has been deformed by high pressure torsion with special attention to the variation of fracture toughness and ductility as functions of pre-strain induced by high pressure torsion. Specimens with different orientations with respect to the principal shear deformation direction have been tested in order to take texture and grain shape changes during deformation into account. The results are compared to those for single phase austenitic and ferritic nanostructured materials and exhibit extreme differences in their fracture and deformation behavior.