TY - JOUR

T1 - Impact of severe plastic deformation on microstructure and fracture toughness evolution of a duplex-steel

AU - Schwarz, K. T.

AU - Kormout, Karoline

AU - Pippan, Reinhard

AU - Hohenwarter, Anton

PY - 2017/8/4

Y1 - 2017/8/4

N2 - The application of duplex steels is constantly increasing due to their excellent combination of high strength and fracture toughness complemented with superior resistance to localized chemical corrosion and stress corrosion. Since ultrafine-grained and nanocrystalline metals have shown improved mechanical and physical properties compared to their coarse grain counterparts, a further optimization of duplex steels could be realized by an additional nano-structuring process. Therefore, in the present study, a conventional duplex steel (X2CrNiMoN22-5-3) was deformed by high pressure torsion (HPT). The evolution of the microstructure and hardness upon deformation was examined. Special attention was devoted to the change of fracture toughness induced by HPT. In order to take grain shape changes during deformation into account, specimens with different orientations with respect to the principal shear deformation direction were tested. A pronounced anisotropy in the crack propagation behavior depending on the specimen orientation combined with an exceptional increase of strength was discovered.

AB - The application of duplex steels is constantly increasing due to their excellent combination of high strength and fracture toughness complemented with superior resistance to localized chemical corrosion and stress corrosion. Since ultrafine-grained and nanocrystalline metals have shown improved mechanical and physical properties compared to their coarse grain counterparts, a further optimization of duplex steels could be realized by an additional nano-structuring process. Therefore, in the present study, a conventional duplex steel (X2CrNiMoN22-5-3) was deformed by high pressure torsion (HPT). The evolution of the microstructure and hardness upon deformation was examined. Special attention was devoted to the change of fracture toughness induced by HPT. In order to take grain shape changes during deformation into account, specimens with different orientations with respect to the principal shear deformation direction were tested. A pronounced anisotropy in the crack propagation behavior depending on the specimen orientation combined with an exceptional increase of strength was discovered.

KW - Anisotropy

KW - Duplex steels

KW - Fracture toughness

KW - High-pressure-torsion

KW - Severe plastic deformation

UR - http://www.scopus.com/inward/record.url?scp=85025608143&partnerID=8YFLogxK

U2 - 10.1016/j.msea.2017.07.062

DO - 10.1016/j.msea.2017.07.062

M3 - Article

AN - SCOPUS:85025608143

VL - 703.2017

SP - 173

EP - 179

JO - Materials science and engineering: A, Structural materials: properties, microstructure and processing

JF - Materials science and engineering: A, Structural materials: properties, microstructure and processing

SN - 0921-5093

IS - 4 August

ER -