Screening for an Alternative to Ni-Based Superalloys in Turbine Blades for the Power Industry

Abstract

Turbine blades in the power industry operate under extreme conditions, requiring materials that can withstand high temperatures, mechanical stress, oxidation, and corrosion. Ni-based superalloys have long been the primary choice due to their exceptional balance of mechanical properties and resistance to harsh environments. However, as operational demands increase, Ni-based superalloys are reaching their performance limits, driving the search for alternative materials. This paper explores the process of screening a wide range of materials to identify the most suitable candidates for turbine blade applications. Through this process, the dominance of Ni-based superalloys is reaffirmed. After determining that Co-based superalloys are the best alternative, a comparative analysis is conducted to evaluate the strengths and limitations of both materials in the context of turbine blade applications. While Co-based superalloys demonstrate superior high-temperature performance, oxidation resistance, and creep resistance, they face challenges such as higher density and increased manufacturing costs.