Modification and characterisation of nickel-based alloy materials for ultra-supercritical power generation

Abstract Ultra-supercritical power generation technology has consistently pioneered energy-efficient utilization techniques, with the development and application of tubing serving as the cornerstone for ultra-supercritical power plant units. Among numerous candidate materials, nickel-based alloys have garnered widespread attention due to their exceptional high-temperature strength and corrosion resistance. This study primarily delineates the modification techniques employed for nickel-based alloy materials utilized in 700°C ultra-supercritical units, encompassing solid-solution strengthening, high-entropy alloys, additive manufacturing, and surface-coating. Additionally, this paper consolidates characterization methodologies for nickel-based alloys, focusing on morphological and crystallinity characterization and mechanical performance evaluations, thereby offering valuable insights and guidance for researchers in this field.