Deformation Structures in a Duplex Stainless Steel

Karin Yvell; Göran Engberg

doi:10.4028/www.scientific.net/MSF.941.176

Paper Titles

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HomeMaterials Science ForumMaterials Science Forum Vol. 941Deformation Structures in a Duplex Stainless Steel

Deformation Structures in a Duplex Stainless Steel

Abstract:

The evolution of the deformation structure with strain has been studied using electron backscatter diffraction (EBSD). Samples from interrupted uniaxial tensile tests and from a cyclic tension/compression test were investigated. The evolution of low angle boundaries (LABs) was studied using boundary maps and by measuring the LAB density. From calculations of local misorientations, smaller orientation changes in the substructure can be illustrated. The different orientations developed with strain within a grain, due to operation of different slip systems in different parts of the grain, were studied using a misorientation profile showing substantial orientation changes after a true strain of 0.24. The texture evolution with increasing strain was followed by using inverse pole figures (IPFs). The observed substructure development in the ferritic and austenitic phases could be successfully correlated with the stress-strain curve from a tensile test. LABs were first observed in the different phases when the strain hardening rate changed in appearance indicating that cross slip started to operate as a significant dislocation recovery mechanism. The evolution of the deformation structure is concluded to occur in a similar manner in the austenitic and ferritic phases but with different texture evolution for the two phases.

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Periodical:

Materials Science Forum (Volume 941)

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176-181

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https://doi.org/10.4028/www.scientific.net/MSF.941.176

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Online since:

December 2018

Authors:

Karin Yvell*, Göran Engberg

Keywords:

Duplex Stainless Steel, Electron Back Scatter Diffraction, Structure-Property Relationship, Tensile Test

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