The Effect of High Pressure Torsion on Structural Refinement and Mechanical Properties of an Austenitic Stainless Steel
In the present study, the high pressure torsion (HPT) was used to refine the grain structure down to the nanometer scale in an austenitic stainless steel. The principles of HPT lay on torsional deformation under simultaneous high pressure of the specimen, which results in substantial reduction in the grain size. Disks of the 316LVM austenitic stainless steel of 10 mm in diameter were subjected to equivalent strains ε of 32 at RT and 450 °C under the pressure of 4 GPa. Furthermore, two-stage HPT processes, i.e., deformation at room temperature followed by deformation at 450 °C, were performed. The resulting microstructures were investigated in TEM observations. The mechanical properties were measured in terms of the microhardness and in tensile tests. HPT performed at two-stage conditions (firstly at RT next at 450 °C) gives similar values of microhardness to the ones obtained after deforming only at 450 °C but performed to higher values of the overall equivalent strain ε. The effect of high pressure torsion on structural refinement and mechanical properties of an austenitic stainless steel was evaluated.
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Document Type: Research Article
Publication date: 01 May 2013
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