Long-term hardness of alloys in the V-TiN, V-ZrN and V-HfN systems

The structure and heat resistance were studied for cast alloys of quasi-binary V-TiN, V-ZrN and V-HfN systems. The method of long-term hardness was used to plot composition-heat resistance diagrams. The V-TiN system alloys with 3-6 vol. % of the nitride phase of the (V, Ti)N composition are most promising for development of heat-resistant compositions. An increased heat resistance of these alloys is explatined by a high cubic content of the nitride phase coherent presipitates and by appearance of strong tetragonal distortions in solid titanium solution in vanadium with nitrogen present