MICROSTRUCTURE AND THERMAL STABILITY OF 0.08%C-17.0%Cr-0.8%Ti STEEL AFTER HIGH-TEMPERATURE NITRIDING AND HIGH PRESSURE TORSION
- 1 The National University of Science and Technology “MISIS”, Moscow, Russia
- 2 Belgorod State National Research Univetsity, Belgorod, Russia
- 3 A.A.Baikov Institute of Metallurgy and Materials Science of RAS, Moscow, Russia. The National University of Science and Technology “MISIS”, Moscow, Russia
Abstract
The influence of high pressure torsion (HPT) on structure, phase composition, microhardness and thermal stability of 0.08%C-17.0%Cr-0.8%Ti steel subjected to volume high-temperature nitriding were investigated. HPT results in the formation of the nanostructure with structural elements size of 55-85 nm. Microhardness of nitrided steel after HPT increases by 2.2-2.7 times. Hardening is retained when heated to 450 °C.