Microstructure Formation in Austenitic Steel after Compression with Oscillatory Torsion Test

Kinga Rodak; Krzysztof Radwański

doi:10.4028/www.scientific.net/SSP.163.110

Paper Titles

A Combined Microscopical and XRD Study of Zinc Coatings
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TEM Investigation of the 3C/6H-SiC Transformation Interface in Layers Grown by Sublimation Epitaxy
p.97

Structure and Properties of the Melt-Spun Fe₄₁Ni₃₉P₁₀Si₅B₅ Alloy Heat Treated at Elevated Temperatures
p.101

Characterization of β and Mg₄₁Nd₅ Equilibrium Phases in Elektron 21 Magnesium Alloy after Long-Term Annealing
p.106

Microstructure Formation in Austenitic Steel after Compression with Oscillatory Torsion Test
p.110

Structural Stability of Cu Processed by Severe Plastic Deformation Method
p.114

Structure and Properties of Cold-Worked and Annealed Ti-Ni-Co Shape Memory Wires Designed for Medical Application
p.118

Studies of Plastically Deformed Ni-Mn-Ga Ferromagnetic Shape Memory Alloy
p.123

Structure of Low Temperature Nitrided/Oxidized Layer Formed on NiTi Shape Memory Alloy
p.127

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Microstructure Formation in Austenitic Steel after Compression with Oscillatory Torsion Test

Abstract:

Different techniques have been used to introduce large strains into metals, for example torsion under pressure (HPT), cyclic extrusion compression (CEC), equal channel angular extrusion (ECAE), or accumulative roll bonding (ARB). Recent investigations are focused on analyzing new and alternative techniques for introducing severe plastic deformation (SPD) and to compare SPD techniques in terms of grain refinement and enhancement of properties. Compression with oscillatory torsion was applied to 0H18N9 austenitic steel to achieve a large strains. The microstructure was characterized using transmission electron microscopy (TEM), scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD). Formation of deformation twins and shear bands are responsible for the structure refinement in materials with low stacking fault energies (SFEs) such as austenitic steel. The investigations revealed, that nano-sized grains of 0H18N9 steel after processing by compression with oscillatory torsion are found in three different types of regions.