Analyses of Texture and Deformation Mechanism in Fine-Grained Austenitic Stainless Steels by Electron Back Scatter Diffraction

Kyoichi Ishida; Taku Matsuo; Muneyuki Imafuku

doi:10.4028/www.scientific.net/MSF.941.218

Paper Titles

Deformation Properties of Austenitic Stainless Steels with Different Stacking Fault Energies
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Understanding Hot vs. Cold Rolled Medium Manganese Steel Deformation Behavior Using In Situ Microscopic Digital Image Correlation
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Effect of Original Microstructure on Microstructure and Mechanical Properties of High Strength Steel WHF1500H during Hot Forming
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Crystal Plasticity Simulation Considering Microstructures of Austenitic Stainless Steel on Macroscopic Yield Function
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Analyses of Texture and Deformation Mechanism in Fine-Grained Austenitic Stainless Steels by Electron Back Scatter Diffraction
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Microstructures and Mechanical Properties of Welded Joints of Several High Tensile Strength Steel
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Change in Yield Strength of Nb-Bearing Ultra-Low Carbon Steels by Temper-Rolling
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VC-Precipitation Kinetics Studied by Small-Angle Neutron Scattering in Nano-Steels
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Influence of Nb Addition on Impact Toughness of As-Quenched Martensitic Stainless Steel for Automotive Applications
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HomeMaterials Science ForumMaterials Science Forum Vol. 941Analyses of Texture and Deformation Mechanism in...

Analyses of Texture and Deformation Mechanism in Fine-Grained Austenitic Stainless Steels by Electron Back Scatter Diffraction

Abstract:

We investigated texture evolution features in fine-grained austenitic stainless steels (JIS-SUS304) under tensile deformation. Three kinds of fine-grained specimens having average grain sizes, d =0.5 μm, 2 μm and 9 μm were prepared. The mechanical properties and phase transformation behaviors of fine grained specimens were compared to those of commercially available SUS304 ( d =16 μm). Tensile test showed increase of yield and tensile strength and decrease of work hardening rate and significant martensitic phase transformation in earlier stage of deformation for 2 μm specimen. These results suggest that simultaneous progress of the dynamic recovery of dislocations in γ-phase and the evolution of harder α’-phase owe the elongation and hardening respectively in fine-grained specimen. From the result of texture analysis, the texture evolution process was different from for each specimen, although the final orientation was almost the same. At the plastic instability stage, an increase of {112}<111>γ phase and a decrease of {112}<113>α’ phase occurred simultaneously for fine-grained 2 μm specimen whereas the opposite tendency was observed for 16 μm specimen. Such a grain size dependence of texture affects an extra ductility of SUS304 at the latter stage of deformation.