Research is currently in progress on the induction surface hardening of titanium and its alloys by 'means of thermochemical treatment with nitrogen and carbon (separately or together), boron, silicon, molybdenum, chromium, beryllium, aluminum, and oxygen. Thermochemical treatment of titanium and its alloys is capable of producing a considerable improvement in the operational complex of strength properties: Wear resistance, fatigue strength, resistance to sticlting, and resistance to gaseous corrosion. Fig. 1. Microstructure of carbided titanium (etchant HF + HN03' + glycerin). (X 360.) We have carried out the carbiding and nitriding of titanium alloys by high-frequency induction heating. The advantages of this method of heating for the thermochemical treatment of metals and alloys are given in detail by the authors in . The present article examines the method and results of the induction surface hardening of titanium and its alloys by carbon and nitrogen. The materials used for the investigation were titanium alloys marks VT-4 and Vf-6. The specimens were prepared in the form of cylindrical rods 3 mm in diameter and 200 mm long, and in the form of rollers 40 rom in diameter and 10 mm thick.