Study of the Influence of the Ratio of Alloying Elements in the Ni–Al–Cr–W–Mo–Ta System on Resistance of Deposited Metal to Thermal Fatigue

An analysis of the influence of the ratio of alloying elements in the Ni–Al–Cr–W–Mo–Ta system on the resistance of the deposited metal to thermal fatigue is presented. The cumulative effect of alloying elements on the resistance of the deposited metal to the appearance of cracks in conditions of cyclic temperature changes in the range of 20–1150°C has been established. It is shown that, in the alloying system under consideration, the sensitivity of the metal to the formation of thermal fatigue cracks mainly depends on the amount of refractory elements that cause the formation of topologically close-packed (TCP) phases. The content in the deposited metal of 3.5 wt % tungsten, 3.0 wt % molybdenum, and 2.5 wt % tantalum does not cause fatigue cracks. The developed type of deposited metal provides a high level of thermal and oxidative wear resistance as compared to high-alloyed industrial nickel and cobalt alloys.