Kinetics of Austenitic Nitriding and Properties of Ni – Co – Cr – W – Ti Alloy

The kinetics of high-temperature nitriding and changes in the structure and properties of heat-resistant Ni – Co – Cr – W – Ti nickel alloy VZh171 depending on its duration were studied. Short-term pulling and long-term strength tests were carried out. An analysis of the microstructure of a nitrided case is presented along with a mathematical description of the process. Recommendations are given for determining the optimal nitriding conditions of the VZh171 alloy in order to achieve the highest short-term and long-term strength. The established dependencies allow the nitriding time during the course of manufacturing items of various thicknesses from the VZh171 alloy to be determined.