title: The effect of high pressure torsion on structural refinement and mechanical properties of an austenitic stainless steel.
abstract: 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 epsilon of 32 at RT and 450 degrees C under the pressure of 4 GPa. Furthermore, two-stage HPT processes, i.e., deformation at room temperature followed by deformation at 450 degrees 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 degrees C) gives similar values of microhardness to the ones obtained after deforming only at 450 degrees C but performed to higher values of the overall equivalent strain epsilon. The effect of high pressure torsion on structural refinement and mechanical properties of an austenitic stainless steel was evaluated.
authors.affiliation: Faculty of Materials Science and Engineering, Warsaw University of Technology, Woloska 141, 02-507 Warsaw, Poland
authors.forename: Agnieszka Teresa
authors.initials: AT
authors.lastname: Krawczynska
authors.forename: Malgorzata
authors.initials: M
authors.lastname: Lewandowska
authors.forename: Reinhard
authors.initials: R
authors.lastname: Pippan
authors.forename: Krzysztof Jan
authors.initials: KJ
authors.lastname: Kurzydlowski
mesh_terms: D003460:Crystallization / Q000379:methods*; D006244:Hardness; D008422:Materials Testing; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D011312:Pressure; D013193:Stainless Steel / Q000737:chemistry*; D013499:Surface Properties; D013696:Temperature; D013718:Tensile Strength; D019415:Torque
chemical_list: C426023:austenitic steel; D013193:Stainless Steel