Materials and manufacturing of advanced industrial gas turbine components

Industrial gas turbines (IGTs) require materials serving 50 000 h at temperatures up to 1050°C under high loading in an aggressive environment. These requirements are different compared to the aircraft engines, which have typically higher peak temperature for a short time, but with cruise cycle temperature significantly lower than the base load temperature for IGT. Gas turbine material development and application is always a compromise between strength and stability, between oxidation and hot corrosion resistance, between coating protection and diffusion-induced degradation, between application of most advanced materials and manufacturing technologies and requirement for an extensive engine experience. This paper gives an overview of gas turbine materials selection, trends in high-temperature materials, environmental and temperature-protective coatings, and in some of manufacturing techniques for industrial gas turbine components.