Abstract
The effect of severe plastic deformation by high-pressure torsion (HPT) on the microstructure, the phase composition, the microhardness, and the thermal stability of 08Kh17T steel preliminarily subjected to high-temperature bulk nitriding followed by annealing is studied. Nitriding is performed in a pure nitrogen atmosphere at 1075°C. HPT is found to cause the formation of a homogeneous nanostructure with a grain size of 55–85 nm. The microhardness of the steel after HPT increases by a factor of 2.2–2.7, to HV 780–860 depending on nitriding conditions. Hardening is retained when the material is heated to 450°C.
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