Corrosion-resistant austenitic steel grade AISI 321 was subjected to severe plastic deformation by multiside forging and rolling to different degrees of plastic deformation. Several structural states were formed, differing in both grain size and dislocation structure. The mechanical properties of steel samples before and after deformation treatment during tensile tests were studied. The nanohardness of the samples was also determined. A significant increase in strength and nanohardness was revealed, which depended on the processing method. In the process of dry friction at different sliding speeds, the tribological properties of steel grade AISI 321 in different structural states were studied. A significant increase in wear resistance and an insignificant decrease in the friction coefficient were established, which is due to a change in the structural state of the material and its mechanical properties. The state of the surface and near-surface layers of the material after friction was studied using metallography and X-ray phase analysis. Changes in sliding friction conditions and structural state affect the lattice parameter in the surface layer of the material formed under the action of friction forces and normal pressure, as well as high temperature. The features of sample wear depending on the structural state and sliding speed are revealed.
A. V. Filippov (Mon,) studied this question.