The working conditions of the blades of steam turbines require increased hardness of the input edges and resistance to impact erosion, high corrosion resistance. In order to increase the service life of the blades, the inlet edges are quenched by high-frequency currents. The hardened layer was formed by electrospark alloying with T15K6 alloy and 15X11MFSh steel. The use of the widely used T15K6 alloy as a hardened electrode is limited due to the presence of cobalt, as an element forming, as a result of activation, long-lived isotopes that reduce the erosion resistance of the blades. Ultra high speed heating and cooling, pulsed effects of temperatures and pressures result lead to the fact that the composition of the alloyed layer can significantly differ from the composition of the starting materials. The microstructure, microhardness, and thickness of the deposited layer were investigated. The hardened surface was monitored by external inspection, bending tests, microhardness measurements, and microstructure studies. The advantages of 15X11MFSh steel for hardening the input edges of the working blades of steam turbines are substantiated.

The influence of electrode material on the state of build-up layer of steam turbine rotor blades is investigated. The strengthening layer is formed by means of the electrospark alloying with use of alloy Т15К6 and steel 15Х11МФШ. Microstructure, microhardness, and thickness of build-up layer are investigated. The advantages of steel 15Х11МФШ for the strengthening of leading edges of steam turbine rotor blades are substantiated.Досліджено вплив матеріялу електроди на стан натопленого шару робочих лопаток парових турбін. Зміцнений шар формувався електроіскровим леґуванням стопом Т15К6 і крицею 15Х11МФШ. Досліджувалися мікроструктура, мікротвердість і товщина натопленого шару. Обґрунтовано переваги криці 15Х11МФШ для зміцнення вхідних крайок робочих лопаток парових турбін.Ключові слова: електроіскрове леґування, електрода, натоплений шар, мікроструктура, мікротвердість, зміцнення.Исследовано влияние материала электрода на состояние наплавленного слоя рабочих лопаток паровых турбин. Упрочнённый слой формировался электроискровым легированием сплавом Т15К6 и сталью 15X11МФШ.